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AutomationDirect .com
MDM-TEL
SELF-DIALING
Industrial Telephone
Modem
Contents at a Glance
Section 1
Overview
5
Section 2
Performance Specifications
7
Section 3
Modem Mounting
8
Section 4
Electrical Connections
9
Section 5
Modem Configuration
12
Section 6
AT Command Summary
16
Section 7
S-Register Summary
20
Section 8
Maintenance Information
28
Section 9
Product Support and Additional Documents
29
Class I, Division 2,
Groups A, B, C, and D
Hazardous Locations
MDM-TEL User Manual
Rev. 3
WARNING
Thank you for purchasing automation equipment from Automationdirect.com™. We want your new automation equipment to
operate safely. Anyone who installs or uses this equipment should read this publication (and any other relevant publications)
before installing or operating the equipment.
To minimize the risk of potential safety problems, you should follow all applicable local and national codes that regulate the
installation and operation of your equipment. These codes vary from area to area and usually change with time. It is your
responsibility to determine which codes should be followed, and to verify that the equipment, installation, and operation are in
compliance with the latest revision of these codes.
At a minimum, you should follow all applicable sections of the National Fire Code, National Electrical Code, and the codes of the
National Electrical Manufacturer’s Association (NEMA). There may be local regulatory or government offices that can also help
determine which codes and standards are necessary for safe installation and operation.
Equipment damage or serious injury to personnel can result from the failure to follow all applicable codes and standards. We do
not guarantee the products described in this publication are suitable for your particular application, nor do we assume any
responsibility for your product design, installation, or operation.
Our products are not fault-tolerant and are not designed, manufactured or intended for use or resale as on-line control equipment in
hazardous environments requiring fail-safe performance, such as in the operation of nuclear facilities, aircraft navigation or
communication systems, air traffic control, direct life support machines, or weapons systems, in which the failure of the product
could lead directly to death, personal injury, or severe physical or environmental damage (“High Risk Activities”).
Automationdirect.com™ specifically disclaims any expressed or implied warranty of fitness for High Risk Activities.
For additional warranty and safety information, see the Terms and Conditions section of our Desk Reference. If you have any
questions concerning the installation or operation of this equipment, or if you need additional information, please call us at 770844-4200.
This publication is based on information that was available at the time it was printed. At Automationdirect.com™ we
constantly strive to improve our products and services, so we reserve the right to make changes to the products and/or
publications at any time without notice and without any obligation. This publication may also discuss features that may not be
available in certain revisions of the product.
TRADEMARKS
This publication may contain references to products produced and/or offered by other companies. The product and company
names may be trademarked and are the sole property of their respective owners. Automationdirect.com™ disclaims any
proprietary interest in the marks and names of others.
Copyright 2014, Automationdirect.com™ Incorporated
All Rights Reserved
No part of this manual shall be copied, reproduced, or transmitted in any way without the prior, written consent of
Automationdirect.com™ Incorporated. Automationdirect.com™ retains the exclusive rights to all information included in this
document.
AVERTISSEMENT
MC
Nous vous remercions d'avoir acheté l'équipement d'automatisation de Automationdirect.com . Nous tenons à ce que votre
nouvel équipement d'automatisation fonctionne en toute sécurité. Toute personne qui installe ou utilise cet équipement doit lire
la présente publication (et toutes les autres publications pertinentes) avant de l'installer ou de l'utiliser.
Afin de réduire au minimum le risque d'éventuels problèmes de sécurité, vous devez respecter tous les codes locaux et
nationaux applicables régissant l'installation et le fonctionnement de votre équipement. Ces codes diffèrent d'une région à l'autre
et, habituellement, évoluent au fil du temps. Il vous incombe de déterminer les codes à respecter et de vous assurer que
l'équipement, l'installation et le fonctionnement sont conformes aux exigences de la version la plus récente de ces codes.
Vous devez, à tout le moins, respecter toutes les sections applicables du Code national de prévention des incendies, du Code
national de l'électricité et des codes de la National Electrical Manufacturer’s Association (NEMA). Des organismes de
réglementation ou des services gouvernementaux locaux peuvent également vous aider à déterminer les codes ainsi que les
normes à respecter pour assurer une installation et un fonctionnement sûrs.
L'omission de respecter la totalité des codes et des normes applicables peut entraîner des dommages à l'équipement ou causer de
graves blessures au personnel. Nous ne garantissons pas que les produits décrits dans cette publication conviennent à votre
application particulière et nous n'assumons aucune responsabilité à l'égard de la conception, de l'installation ou du
fonctionnement de votre produit.
Nos produits ne sont pas insensibles aux défaillances et ne sont ni conçus ni fabriqués pour l'utilisation ou la revente en tant
qu'équipement de commande en ligne dans des environnements dangereux nécessitant une sécurité absolue, par exemple,
l'exploitation d'installations nucléaires, les systèmes de navigation aérienne ou de communication, le contrôle de la circulation
aérienne, les équipements de survie ou les systèmes d'armes, pour lesquels la défaillance du produit peut provoquer la mort, des
blessures corporelles ou de graves dommages matériels ou environnementaux («activités à risque élevé»). La société
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Automationdirect.com nie toute garantie expresse ou implicite d'aptitude à l'emploi en ce qui a trait aux activités à risque
élevé.
Pour des renseignements additionnels touchant la garantie et la sécurité, veuillez consulter la section Modalités et conditions de
notre documentation. Si vous avez des questions au sujet de l'installation ou du fonctionnement de cet équipement, ou encore si
vous avez besoin de renseignements supplémentaires, n'hésitez pas à nous téléphoner au 770-844-4200.
Cette publication s'appuie sur l'information qui était disponible au moment de l'impression. À la société
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MARQUES DE COMMERCE
La présente publication peut contenir des références à des produits fabriqués ou offerts par d'autres entreprises. Les désignations
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respectifs. Automationdirect.com nie tout intérêt dans les autres marques et désignations.
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Copyright 2014, Automationdirect.com
Incorporated
Tous droits réservés
Nulle partie de ce manuel ne doit être copiée, reproduite ou transmise de quelque façon que ce soit sans le
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conserve les droits exclusifs à l'égard de tous les renseignements contenus dans le présent document.
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MC
WARNING
All power, input and output (I/O) wiring must be in accordance with Class I, Division 2 wiring methods and in
accordance with the authority having jurisdiction.
“This Equipment is Suitable for Use in Class I, Division 2, Groups A, B, C, D or Non-Hazardous Locations Only”.
WARNING – EXPLOSION HAZARD – SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION 2.
WARNING – EXPLOSION HAZARD – WHEN IN HAZARDOUS LOCATIONS, DISCONNECT POWER BEFORE REPLACING OR
WIRING UNITS.
WARNING – EXPLOSION HAZARD – DO NOT DISCONNECT EQUIPMENT UNLESS POWER HAS BEEN SWITCHED OFF OR
THE AREA IS KNOWN TO BE NONHAZARDOUS.
WARNING – EXPLOSION HAZARD – IN HAZARDOUS OR POTENTIALLY HAZARDOUS LOCATIONS, DO NOT SEPARATE ANY
PART OF THE UNIT WHEN ENERGIZED. USE THE UNIT FOR INTERNAL CONNECTIONS ONLY.
AVERTISSEMENT
Tout pouvoir, le câblage d’entrée et de sortie (I/O) doivent être conformes aux méthodes de câblage de
Classe I, Division 2 et conformément à l’autorité compétente.
“Cet équipement est adapté pour une utilisation en Classe1, Division 2, Groupes A, B, C et D ou endroits nondangereux seulement ”.
AVERTISSEMENT – RISQUE D’EXPLOSION – LA SUBSTITUTION DE TOUT COMPOSANT PEUT NUIRE À LA CONFORMITÉ DE
CLASSE I, DIVISION 2.
AVERTISSEMENT – RISQUE D’EXPLOSION – LORSQUE DANS DES ENDROITS DANGEREUX, DÉBRANCHEZ LE CORDON
D'ALIMENTATION AVANT DE REMPLACER OU DE BRANCHER LES MODULES.
AVERTISSEMENT – RISQUE D’AVERTISSEMENT – NE DÉBRANCHEZ PAS L’ÉQUIPEMENT PENDANT QUE LE CIRCUIT EST
DIRECT OU À MOINS QUE L’ENVIRONNEMENT SOIT CONNU POUR ÊTRE LIBRE DE CONCENTRATIONS INFLAMMABLES.
AVERTISSEMENT – RISQUE D’EXPLOSION – DANS LES ENDROITS DANGEREUX OU POTENTIELLEMENT DANGEREUX, NE
PAS SEPARER UNE PARTIE DE L'UNITE SOUS TENSION. SEULEMENT UTILISEZ L'APPAREIL POUR LES CONNEXIONS
INTERNES.
MDM-TEL User Manual
Page 4
Rev 3
Section 1
Overview
This rugged industrial telephone modem has been designed for operation in electrical enclosures installed
in harsh environments. This industrial modem supports all standard Hayes AT commands, Fax Class 1 and
Class 2 commands and S-registers, and therefore can be set-up as an external modem on any PC. The
industrial modem is compatible with any telecommunications or dial-up networking software.
The industrial modem allows easy access to PLCs, RTUs, I/O equipment, industrial computers, remote
weather stations, pagers, and many other devices via standard analog PSTN-provided dial-up telephone
connections. The modem may be DIN-rail or panel mounted, adjacent to other DIN-rail components,
inside of new or existing enclosures. Most Windows software can communicate through the industrial
modem, to perform file transfers, diagnostics, program debugging and many other operations.
The industrial modem allows communication to remote sites for data retrieval or diagnostics.
Note: The modem communicates over analog phone lines only.
FIGURE 4-3: Industrial Modem Wiring Example
The industrial PLC Self-Dialing Modem has the ability to dial out based on an alarm contact closure or
PLC discrete output.
MDM-TEL User Manual
Page 5
Rev 3
Industrial Contact Initialized Modem
The contact initialized action is triggered by a switch closure or PLC output signal. When the self-dial
input is energized, the modem dials a pre-stored phone number and optionally identifies itself by way of a
pre-stored ASCII message. Flexible features allow this modem to perform retries or even connect to an
alternate number until it has verified that a connection has been established. The call will terminate when
either:
 The computer completes its polling and hangs up
 The self-dialing discrete input is turned off
 A telephone line problem disrupts the call.
The contact initialized feature enables field-installed equipment to establish a telephone link based upon a
simple switch closure. This modem adds “dial upon alarm” intelligence to any remote site. This modem is
ideal for:
DIALING UPON ALARM FROM ANY PLC
This modem establishes a connection based upon a coil output from any PLC. Once a connection
has been established, the PLC’s system (programming) port is connected to the computer at the
other end of the phone link and may be polled by that computer as if the computer had initiated the
call. When the modem connects to the central computer, it identifies itself so the computer can run
the appropriate I/O driver and interrogate the PLC.
SENDING A MESSAGE BASED UPON A SWITCH CONTACT
Locations that do not have PLCs (or other intelligence) can originate calls to alert you to low tank
levels, over temperature conditions, or other alarms. Simply connect the appropriate alarm contact
to the modem’s input. The modem will dial the pre-stored phone number and deliver a stored ID
message to the computer at the receiving end.
SETUP WIZARD
A modem setup utility is provided on the Industrial Modem CD to help you quickly configure the modem.
In most applications, no knowledge of modem AT commands or S register contents is necessary. Preconfigured profiles, for common situations, are provided for your convenience.
MDM-TEL User Manual
Page 6
Rev 3
Section 2
Performance Specifications
Telephone Port
Max. Data Rate
Compatibility
Data Compression
Error Correction
Max Fax Modem Rate
Fax Modem Compatibility
Ringer Equivalent
Line Jack
Phone Jack
RS232 Port
Max. RS232 Rate
RS232 Signal Support
RS232 Connector
Command Set
CD
TR
Status LEDs
(Carrier detect)
(Data Terminal Ready)
33.6 kbps (V.34)
V.34, V.32bis, V.32, V.22bis, V.22A/B, V.23, V.21, Bell212A & 103
V.44/V.42bis/MNP 5
V.42/MNP 2-4
14.4 kbps (V.33)
Group 3 (V.33, V.17, V.29, V.27ter, V.21 ch. 2)
0.3
RJ11
RJ11
115.2 kbps (Kilobaud)
TXD, RXD, CTS, RTS, DCD, DTR, DSR, RI, GND
DB9 female, RS232
All standard AT and S register commands including Class 1, Class 2 Fax commands
and Voice commands
The modem has detected a carrier on the phone line (a remote modem has been
detected).
The PC (or Gateway/VersaTRAK) has established a connection to the modem and is
ready.
Flashes as data is received from the phone line.
Flashes as data is sent out the phone line.
On when power is present.
RD (Receive Data)
TD (Transmit Data)
Power
General Characteristics
Input Power
10 - 30 VDC
Input Current Normal / Low Power
97mA @ 24VDC (normal) / 64mA @ 24VDC (low power)
Operating Temperature
-30 ° to 70 ° C
Storage Temperature
-40 ° to 85 ° C
Humidity
5 to 95% RH (non-condensing)
Mounting
DIN rail or panel mount
Dimensions
3.23W x 4.75L x 1.35H inches
(8.2 W x 12.1 L x 3.4H cm)
PLC Discrete I/O Interface
Trigger Input (From PLC)
Connects to PLC output. Starts auto-dialing upon transition from OFF to ON. Modem
will stay connected while input is ON.
Voltage Range
9 to 30 VDC
Input Current
6.5mA at 24 VDC
Max. OFF Voltage
5 VDC
On-line Output (To PLC)
Output is ON as long as a connection exists (carrier detect).
Output Characteristics
Sourcing – switches supply power
Max. Output Current
100mA
MDM-TEL User Manual
Page 7
Rev 3
Section 3
Modem Mounting
This industrial modem snaps onto a standard DIN rail (DIN EN 50022), or can be mounted to a flat panel
using #6 or #8 screws. See Figure 3-1. The modem can be installed in any orientation, adjacent to other
DIN rail components or in any convenient location within the enclosure. The modem should be installed
within 6 feet of the device it will be connected to.
Figure 3-1: MODEM DIMENSIONS
For DIN rail mounting, hook the top, rear of the modem onto the top edge of the DIN rail. Using a small
flat head screwdriver, pull down on the spring-loaded tab on the bottom of the modem and push the
modem back against the rail. Reverse these steps to remove the modem. See Figure 3-2 below.
Figure 3-2: DIN RAIL MOUNTING
MDM-TEL User Manual
Page 8
Rev 3
Section 4
Electrical Connections
RS232 Connections:
Use a straight-through or equivalent serial cable to connect the modem's RS232 female port (DB9 cable
male end) to the RS232 male port on a PC or other “Data Terminal Equipment” (DTE) device (DB9 cable
female end). Figure 4-1 details the pin out of a straight through serial communications cable suitable for
connecting a DCE device (MDM-TEL) to a DTE device
(PC, PLC or other device). A suitable DB9 RS-232 cable is provided with the MDM-TEL modem.
Figure 4-1: MODEM CABLE WIRING
NOTE: A suitable serial cable has been provided with the MDM-TEL. The provided null modem adapter
is not required for normal serial communications between the MDM-TEL and a PC.
MDM-TEL User Manual
Page 9
Rev 3
AutomationDirect cables for connecting DirectLOGIC PLC’s to the MDM-TEL modem are shown in Fig
4-2. The null modem adapter supplied with the modem is required when using these cables. The pinouts
for custom cables between DirectLOGIC PLC’s and the MDM-TEL modem are detailed in the MDM-TEL
Application Note provided on the MDM-TEL CD and available from www.automationdirect.com. For
other devices or PLC’s, please refer to the product documentation for its cable pinouts.
AutomationDirect does not recommend using modems
on DirectLogic ports not listed in the above chart due
to telecommunication timing irregularities.
FIG 4-2
MDM-TEL User Manual
Page 10
Rev 3
Industrial Modem Power, Phone Line, I/O connections:
DC Power Wiring
Connect 10 - 30 VDC to the industrial modem as shown in Figure 4-3. The modem can usually be powered
from the same source as other devices in the enclosure. All the screw terminals should be tightened to a
maximum of 3.48 in-lbs.
Telephone Cable
Connect analog phone lines to the RJ11 jacks as appropriate. One RJ-11 jack is provided to connect
directly to a telephone (optional) and the second RJ-11 jack functions as the connection to the telephone
network.
PLC Self-Dial I/O Connections
Connect a 10-30VDC signal to the ‘From PLC’ (trigger input) terminal. An OFF to ON transition of this
signal starts the auto-dialing sequence. The modem will call and remain connected while the signal is ON.
When the signal goes false, the modem will terminate the connection or the call in progress.
The ‘To PLC’ (on-line output) terminal will go ON (ON = user supplied VDC input) when a modem-tomodem connection has been established and the proper ‘Acknowledge Message’ has been received.
Figure 4-3: INDUSTRIAL MODEM WIRING
MDM-TEL User Manual
Page 11
Rev 3
Section 5
Modem Configuration
Configuration as an External Modem on a PC:
The Modem can be connected directly to a PC. The modem will need to be “installed” in Windows prior to
use. Here are instructions on how to install the modem in Windows 95, 98, NT, 2000 and Windows XP.
Modem Installation in Windows 95/98/NT/2000/XP
Plug and Play method (recommended):
1) With the PC off, connect DC power and the telephone line to the modem. Connect a communications
cable (STRAIGHT-THROUGH or equivalent) between the modem and the PC. Turn on the PC.
During the boot-up process, Windows should detect the modem and display the New Hardware Found
dialog box.
2) Make the selection “Select from a list of alternative drivers”.
3) The Select Device dialog will be displayed. In the column labeled Manufacturers, select “Standard
Modem Types”. In the column labeled Models, select “Standard 28800 bps Modem”. Click OK.
Windows will then complete the boot-up process. (The standard Windows driver is used for the
Industrial Modem. Although the modem supports baud rates to 33,600 bps, the selections in Windows
are limited to 28800 bps.)
4) To verify that the modem has been installed, select Start  Settings  Control Panel, and then double
click the Modems icon. The modem should be listed as “Standard 28800 bps Modem”.
Here is an alternate modem installation procedure (use if the PC is already powered up):
1) Connect the DC power, communications cable (STRAIGHT-THROUGH or equivalent) and telephone
line as described above.
2) Select Start  Settings  Control Panel, and then double click the Modems icon.
3) The Install New Modem dialog box will appear. Do not select the “Don’t detect my modem, I will
select it from a list”. Instead, click Next and allow Windows to search the COM ports and detect the
modem.
4) Windows should find a modem called Standard Modem. Click Next and Windows will complete
installation of the Standard Modem. (Alternately, click Change and select “Standard Modem Types”
from the Manufacturers list, and “Standard 28800 bps Modem” from the Models list.)
5) To verify that the modem has been installed, select Start  Settings  Control Panel, and then double
click the Modems icon. The modem should be listed as either a “Standard Modem” or a “Standard
28800 bps Modem” depending on the steps followed above.
6) Upon re-booting the machine, Windows may still find the modem as new hardware. If this happens,
select “Do not install a driver (Windows will not prompt again)”.
MDM-TEL User Manual
Page 12
Rev 3
Modem Installation in Windows NT
1) Select Start  Settings  Control Panel, and then double click the Modems icon.
2) The Install New Modem dialog box will appear. Do not select the “Don’t detect my modem, I will
select it from a list”. Instead, click Next and allow Windows to search the COM ports and detect the
modem.
3) Windows should find a modem called Standard Modem. Click Next and Windows will complete
installation of the Standard Modem. (Alternately, click Change and select “Standard Modem Types”
from the Manufacturers list, and “Standard 28800 bps Modem” from the Models list.)
4) To verify that the modem has been installed, select Start  Settings  Control Panel, and then double
click the Modems icon. The modem should be listed as either a “Standard Modem” or a “Standard
28800 bps Modem” depending on the steps followed above.
Once the MDM-TEL modem has been added to your Windows 95, 98, NT, 2000 or XP system, it is ready
for use.
If you are using a PLC or other device, refer to the documentation for that device as necessary.
To Remove a Modem
If it ever becomes necessary to re-install the modem for any reason, select Start  Settings  Control
Panel, and then double click the System icon. Next, click the Device Manager tab. The list should display
a Modems icon. Double click the Modems icon. Highlight the modem to be removed and then click the
Remove button. To reinstall the modem, follow the installation steps as previously described.
MDM-TEL User Manual
Page 13
Rev 3
Configuring Using the Setup Wizard:
It is highly recommended that the Setup Wizard be used for modem configuration. Simply check the
appropriate boxes, choose the appropriate communication settings from the drop down lists, and load the
configuration into the modem. This utility does not require user knowledge of AT commands and Sregisters.
Refer to the online help system in the Setup Wizard for instructions and application notes.
Note:
The Setup Wizard must be used to configure the parameters of the industrial modem. See MDM-TEL
application note for details on configuring the MDM-TEL for DirectLOGIC PLC’s.
Setting the Modem's Serial Port Baud Rate for the PLC
The industrial modem has an automatic baud rate detection feature that lets the modem recognize commands through
its serial port at any supported baud rate. When auto-detect is selected, if the modem is connected to a device that
does not send commands or data unless spoken to (such as most PLCs), then the modem will pass information from
the phone line to its serial port at the last auto-detected baud rate.
The industrial modem is defaulted at the factory for 9600-baud. To change this setting, connect the modem to a PC.
Start the Setup Wizard and choose the baud rate that matches the PLC’s baud rate. Then choose the appropriate
settings and write the configuration to the modem. Exit the Setup Wizard and reconnect the modem to the PLC. (Be
sure to cycle power to the modem.) Call the modem and verify that the PLC is responding to commands.
MDM-TEL User Manual
Page 14
Rev 3
Limiting the Phone Line Connection Speed for Reliability
Typically, when a modem-to-modem connection is established, the two modems negotiate and connect at the fastest
possible phone line speed that is within the capability of both modems. The quality of the phone line connection
(during the negotiation) will be taken into account. If both modems are of a modern design, the phone line speed can
be 33.6K bits per second (or higher, using data compression). Note that this phone line speed is independent of the
DTE (serial port) speed, though some older modems require that the phone line speed and DTE speed be the same.
In practice the quality of any phone line changes continually, and frequent data errors may occur. The probability of
errors usually increases as the phone line speed increases. Therefore, it is often desirable to restrict the phone line
speed to a rate that will provide good performance and yield reliable data. It is also commonplace to restrict the
phone line speed to maintain compatibility when replacing an older modem with an industrial modem.
By default, the modem will permit any phone line speed up to 115.2 kbps when data compression is enabled. If you
experience intermittent or unreliable communication, try setting the modem-to-modem speed (in the Setup Wizard)
to a lower value, to restrict the phone line speed. (Remember to load the new configuration to the modem.)
Industrial Modem Profile Summary
Here is a summary of the active configuration, user profile 0, user profile 1 and the factory defaults when
the modem is shipped.
Each time the modem is powered up; first the factory default settings (as listed in Section 6) are loaded
into the active configuration. Next, the designated user stored profile is loaded into the active
configuration. User profile 0 is loaded by default (see the &Y command in Section 6) and it contains all
factory defaults with the exception that it is set to auto answer (register S0=1), and ignore the DTR signal
(&D0).
The User profile 1 contains all normal factory defaults (as listed in Section 6).
ACTIVE CONFIGURATION:
B1 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D0 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0 &Y0
S00:001 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:050 S08:002 S09:006
S10:014 S11:095 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000 S38:020 S44:020
S46: 138 S48:007 S95:000
STORED PROFILE 0:
B1 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D0 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0
S00:001 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000
S36:007 S37:000 S40:104 S41:195 S46:138 S95:000
STORED PROFILE 1:
B1 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0
S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000
S36:007 S37:000 S40:104 S41:195 S46:138 S95:000
FACTORY DEFAULTS:
B1 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0
S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000
S36:007 S37:000 S40:104 S41:195 S46:138 S95:000
MDM-TEL User Manual
Page 15
Rev 3
Section 6
AT Command Summary
The industrial modem supports the AT commands, Fax Class 1 and Class 2 commands listed in this
Section. The modem contains a set of factory default settings, which can always be restored by the user.
(See the &F command.) The modem also provides two user profiles (profile 0 and profile 1) which hold
settings as set and saved by the user. (See the &W command.) The settings currently in use by the modem
are generally referred to as the active configuration.
Notes:
The Industrial Modem parameters can only be set using the Setup Wizard, which is provided. Refer to the
on-line help in the Setup Wizard for more information.
The following tables only summarize the supported AT commands. The valid parameters and default
settings for each AT command are documented in the online help system of the Setup Wizard.
Commands marked with an asterisk (*) have different characteristics, depending on the revision of SelfDialing modem being used. Refer to the online help system of the Industrial Modem Setup Wizard for the
details of these differences.
Command
A/
A
AT=x
AT?
Bn
Cn
Dn
E
Fn
Hn
In
Ln
Mn
Nn
On
P
Qn
Sn
Sn-x
Sn?
T
Vn
Wn
Xn
Yn
Zn
&Cn
Function
Re-execute Last Command; do not precede with AT command and do not follow with a
carriage return.
Go off hook and Answer A Call
Write value x to last selected register.
Report the value of last selected register.
Set data standard to CCITT(Europe et. al.) or Bell Mode(U.S., Canada) for connections at
300 or 1200 bps.
Carrier Control (parameter = 1 only)
Dial (originate a call); typical usage: ATDT5551212 to tone dial number.
ATDS=n to dial nth stored number.
Echo command to monitor when typed
Not available.
Disconnect (Hang up)
Identification; reports product code, name, ROM and firmware data, etc.
Speaker Volume (not available)
Speaker Control (not available)
Automode Enable; enabled allows connection at highest possible modem speed,
disabled fixes speed according to register S37.
Return To On-line Data Mode
Set Pulse Dial Default.
Quiet Results Codes Control; when enabled, result codes are reported to the monitor.
Establishes S Register n as the last register accessed
Write value x to S Register n.
Reports the value of S Register n.
Set Tone Dial Default
Set Result Code Format to terse or verbose.
Connect Message Control sets the format of the connect messages.
Extended results code
Long space disconnect
Perform Soft Reset and Restore stored user configuration profile 0 or 1.
RLSD (DCD) Option; set DCD signal to indicate presence of carrier or forces DCD signal
on at all times.
MDM-TEL User Manual
Page 16
Rev 3
&Dn
&Fn
&Gn
&Jn
&Kn
&Mn
&Pn
&Qn
&Rn
&Sn
&Tn
&V
&V1
&Wn
&Xn
&Yn
&Zn=x
%E
%L
%Q
%7
%8
\Kn
\Nn
\Vn
+MS
+Hn
-SDR
**
%Cn
\An
\Bn
)Mn
*Hn
-Kn
-Qn
-SEC=n
@Mn
:E
*B
*D
*NCn
FAX CLASS 1:
+FCLASS=n
+FAE=n
+FRH=n
+FRM=n
+FRS=n
+FTH=n
+FTM=N
+FTS=n
DTR Option; set how modem interprets the DTR signal.
Restore factory configuration profile 0 or 1.
Select guard tone
Telephone jack control
Set Flow Control
Asynchronous/synchronous mode selection
Select pulse dial make/break ratio
Asynchronous/synchronous mode selection
RTS/CTS option sets how the modem controls the CTS signal
DSR Override sets how the modem controls the DSR signal
Test & diagnostic settings
Display current configuration, stored user profiles and stored telephone numbers
Display last connection statistics
Store current active configuration in one of the two user profiles
Select synchronous clock source
Designate a default-reset profile. This profile will be active after a hard reset
Store phone number; n = 0 to 3 and x = dial string
Enable/disable line quality monitor and autoretrain or fallback/fail forward
Report line signal level
Report line signal quality
Plug and Play Serial Number
Plug & Play Vendor ID, Prod. No.
Break Control sets how the modem responds to a break signal
Sets the Operating Mode of the modem: direct, normal, reliable or auto reliable
Single Line Connect Message Enable
Select Modulation allows control of the modulation the modem uses to negotiate a
connection
Enable/Disable RPI and DTE Speed
Enable/Disable distinctive ring
Download to flash memory
Enable/Disable Data Compression (MNP5, V42bis or both)
Select Max MNP Block Size
Transmit Break to Remote sets the length of break signal sent to remote modem(in non error
correction mode)
Enable Cellular Power Level Adjust (only included for compatibility and performs no
function)
Link Negotiation Speed (only included for compatibility and performs no function)
MNP Extended Services
Enable Fallback to V.22bis/V.22 (only included for compatibility and performs no function)
Enable/Disable MNP-EC
Initial Cellular Power Level Setting (only included for compatibility and performs no
function)
Compromise Equalizer Enable (only included for compatibility and performs no function)
Display Blacklisted Numbers
Display Delayed Numbers
Country Select
Service Class
Data/Fax Auto Answer
Receive Data with HDLC Framing
Receive Data
Receive Silence
Transmit Data with HDLC Framing
Transmit Data
Stop Transmission and Wait
MDM-TEL User Manual
Page 17
Rev 3
FAX CLASS 2:
+FCLASS=n
+FAA=n
+FAXERR
+FBOR
+FBUF?
+FCFR
+FCON
+FCIG
+FCR
+FCSI:
+FDCC=
+FDCS:
+FDCS=
+FDIS:
+FDIS=
+FDR
+FDT=
+FDTC:
+FET:
+FET=n
+FHNG
+FK
+FLID=
+FLPL
+FMDL?
+FMFR?
+FPHCTO
+FPOLL
+FPTS:
+FREV?
+FSPL
+FTSI:
Caller ID:
#CID=0
#CID=1
#CID=3
AudioSpan and
DSVD:
-SMS=
-SSE=
-SQS=
Synchronous
Access Mode:
+ES
+ESA
+ITF
Voice/Audio:
#BDR
#CLS
#MDL?
#MFR?
#REV?
#SPK=
Service Class
Adaptive Answer
Fax Error Value
Phase C Data Bit Order
Buffer Size (Read Only)
Indicate Confirmation to Receive
Facsimile Connection Response
Set the Polled Station Identification
Capability to Receive
Report the Called Station ID
DCE Capabilities Parameters
Report Current Session
Current Session Results
Report Remote Capabilities
Current Session Parameters
Begin or Continue Phase C Receive Data
Data Transmission
Report the Polled Station Capabilities
Post Page Message Response
Transmit Page Punctuation
Call Termination with Status
Session Termination
Local ID String
Indicate a Document for Polling
Identify Model
Identify Manufacturer
Phase C Time Out
Indicates Polling Request
Page Transfer Status
Identify Revision
Enable Polling
Report the Transmit Station ID
Disable Caller ID
Enable Caller ID with Formatted Presentation
Enable Caller ID with Unformatted Presentation
Section AudioSpan/DSVD Mode
Enable/Disable DSVD
Select AudioSpan Modulation
Enable/Disable Synchronous Access Mode in the client or central site modem
Configures the Operation of the Synchronous Access Submode
Selects Transmit Flow Control Thresholds
Select baud rate (turn off autobaud). Enable/Disable RPI and DTE Speed
Select data, fax, or voice/audio.
Identify model.
Identify manufacturer.
Identify revision level.
Speakerphone Setting
MDM-TEL User Manual
Page 18
Rev 3
#TL
#VBQ?
#VBS
#VBT
#VCI?
#VGT
#VLS
#VRA
#VRN
#VRX
#VSD
#VSK
#VSP
#VSR
#VSS
#VTD
#VTM
#VTS
#VTX
Audio output transmit level.
Query buffer size.
Bits per sample
Beep tone timer.
Identify compression method
Set playback volume in the Command State
Voice line select
Ringback goes away timer (originate)
Ringback never came timer (originate)
Voice Receive Mode
Enable silence deletion (No Function, Command Response Only)
Buffer skid setting.
Silence detection period (voice receive)
Sampling rate selection
Silence detection tuner (voice receive)
DTMF tone reporting capability
Enable timing mark placement
Generate tone signals.
Voice transmit mode
MDM-TEL User Manual
Page 19
Rev 3
Section 7
S Register Summary
Note:
The following tables only summarize the supported S-registers.
Register
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
S23
S24
S25
S26
S27
S28
Function
Number of rings required before modem auto answers
Ring counter increments each time a ring is detected
Escape character
Carriage return character
Line feed character
Backspace character
Maximum time to wait after going off-hook to dial when blind
dialing
Maximum time to wait for carrier after dialing before hanging
up
Pause time for dial delay modifier
Carrier detect response time; duration that carrier must be
present for modem to consider it a valid connection
Carrier loss disconnect time; carrier must be absent for this time
for modem to consider it a lost connection
DTMF tone duration
Escape prompt delay; this delay must be present after receipt of
the last character of the escape sequence( before receipt of any
other character) for the escape sequence to be recognized
Reserved
General bit mapped options indicates the status of the following
options: echo, quiet mode, results codes, tone/pulse and
originate/answer
Reserved
Test mode bit mapped options (&T)
Reserved
Test Timer – length of test initiated by Tn command
AutoSync Bit Mapped Options
AutoSync HDLC Addr or BSC Sync Char
V24/general bit mapped options indicates the status of the
following options: CTS(&Rn), DTR(&Dn), DCD(&Cn),
DSR(&Sn), long space disconnect(Yn)
Speaker/results bit mapped options indicates the status of the
following options: speaker control(Ln), volume(Mn), results
codes(Xn)
General Bit Mapped Options
Sleep inactivity timer sets the length of time that the modem will
operate in normal mode without activity on the phone or RS232
port before entering sleep mode
Delay to DTR (CT108) off sets time modem ignores DTR signal
before taking action specified by &Dn
RTS-to-CTS (CT105 to CT106) delay if &R0 is set
General Bit Mapped Options for sync/async
control(&Mn/&Qn), leased line control(&Ln), clock
select(&Xn), Bell/CCITT mode(Bn)
General Bit Mapped Options indicates options for pulse
dialing(&Pn), MNP Link negotiation speed(*Hn)
MDM-TEL User Manual
Page 20
Range
0-255
0-255
0-255
0-127
0-127
0-255
2-255
Units
rings
rings
ASCII
ASCII
ASCII
ASCII
sec
Default
0
0
43
13
10
8
2
1-255
sec
50
0-255
1-255
sec
0.1s
2
6
1-255
0.1s
14
50-255
0-255
0.001s
0.02s
95
50
-
-
138(8Ah)
0-255
0-255
-
s
-
0
0
0
0
52(34h)
-
-
117(75h)
0-255
s
58(3Ah)
0
0-255
s/0.01s
5
0-255
-
0.01s
-
1
73(49h)
-
-
0
Rev 3
S29
S30
S31
S32
S33
S34-S35
S36
S38
S39
S40
S41
S42-S45
S46
S48
S82
S86
S91
S92
S95
Flash Modifier Time sets the length of time the modem will go
on hook if the flash dial modifier(!) is encountered in the dial
string
Inactivity timer sets the length of time the modem will remain
on line if no data is sent or received
General Bit Mapped Options
XON character
XOFF character
Reserved
LAPM Failure Control used when register S48=128
Delay before forced hang-up (time delay between the receipt of
H command to disconnect and the actual disconnect operation
Flow control bit mapped options
General bit mapped options
General bit mapped options
Reserved
Enable/Disable Data Compression
V.42 Negotiation Control
LAPM Break Control
Call Failure Reason Code; when the No Carrier result code is
issued, the reason for the failure is written to this register
PSTN transmit attenuation level
Fax transmit attenuation level
Result code messages control
0-255
10 ms
70
0-255
10s
0
0-255
0-255
0-255
ASCII
ASCII
s
194(C2h)
17(11h)
19(13h)
7
20
0-255
-
3
104(68h)
195(C3h)
138
7
128(40h)
-
0-15
0-15
-
dBm
dBm
-
10
10
0
S Register specific bits
S14 General bit mapped options indicates the status of the following options: echo, quiet mode,
results codes, tone/pulse and originate/answer
Bit 0 - This bit is ignored.
Bit 1 - Command echo (En)
0 = Disabled (E0)
1 = Enabled (E1) (Default.)
Bit 2 - Quiet mode (Qn)
0 = Send result codes (Q0) (Default.)
1 = Do not send result codes (Q1)
Bit 3 - Result codes (Vn)
0 = Numeric (V0)
1 = Verbose (V1) (Default.)
Bit 4 - Reserved
Bit 5 - Tone (T)/Pulse (P)
0 = Tone (T) (Default.)
1 = Pulse (P)
Bit 6 - Reserved
Bit 7 - Originate/Answer
0 = Answer
1 = Originate (Default.)
S16 Test mode bit mapped options (&T)
Bit 0 - Local analog loopback
0 = Disabled (Default.)
1 = Enabled (&T1)
MDM-TEL User Manual
Page 21
Rev 3
Bit 1 - Not used
Bit 2 - Local digital loopback
0 = Disabled (Default.)
1 = Enabled (&T3)
Bit 3 - Remote digital loopback (RDL) status
0 = Modem not in RDL (Default.)
1 = RDL in progress
Bit 4 - RDL requested (AT&T6)
0 = RDL not requested (Default.)
1 = RDL requested (&T6)
Bit 5 - RDL with self test
0 = Disabled (Default.)
1 = Enabled (&T7)
Bit 6 - Local analog loopback (LAL) with self test
0 = Disabled (Default.)
1 = Enabled (&T8)
Bit 7 - Not used
S19 AutoSync Bit Mapped Options
Bit 0 - Reserved
Bit 1 - BSC/HDLC format select
0=
BSC selected (Default.)
1=
HDLC selected
Bit 2 - Address detection enable/disable
0=
Disabled (Default.)
1=
Enabled
Bit 3 - NRZI/NZI coding select
0=
NRZI (Default.)
1=
NZI
Bit 4 - Idle indicator select
0=
Mark idle (Default.)
1=
Flag or sync idle
Bits 5 - 7 Reserved
s21 V24/general bit mapped options indicates the status of the following options: CTS(&Rn),
DTR(&Dn), DCD(&Cn), DSR(&Sn), long space disconnect(Yn)
Bit 0 - Set by &Jn command but ignored otherwise.
0 = &J0 (Default.)
1 = &J1
Bit 1 - Reserved
Bit 2 - CTS behavior (&Rn)
0 = CTS tracks RTS (&R0)
1 = CTS always on (&R1) (Default.)
Bits 3-4 - DTR behavior (&Dn)
0 = &D0 selected (Default.)
1 = &D1 selected
2 = &D2 selected
3 = &D3 selected
MDM-TEL User Manual
Page 22
Rev 3
Bit 5 - RLSD (DCD) behavior (&Cn)
0 = &C0 selected (Default.)
1 = &C1 selected
Bit 6 - DSR behavior (&Sn)
0 = &S0 selected (Default.)
1 = &S1 selected
Bit 7 - Long space disconnect (Yn)
0 = Y0 (Default.)
1 = Y1
S22 Speaker/results bit mapped options indicates the status of the following options: speaker
control(Ln), volume(Mn), results codes(Xn)
Bits 0-1 Speaker volume (Ln)
0=
Off (L0)
1=
Low (L1) (Default.)
2=
Medium (L2)
3=
High (L3)
Bits 2-3 Speaker control (Mn)
0=
Disabled (M0)
1=
Off on carrier (M1) (Default.)
2=
Always on (M2)
3=
On during handshake (M3)
Bits 4-6 Limit result codes (Xn)
0=
X0
4=
X1
5=
X2
6=
X3
7=
X4 (Default.)
Bit 7- Reserved
S23 General Bit Mapped Options
Bit 0- Grant RDL
0=
RDL not allowed (&T5) (Default.)
1=
RDL allowed (&T4)
Bits 1-3 DTE Rate
0=
0 - 300 bps
1=
600 bps
2=
1200 bps
3=
2400 bps
4=
4800 bps
5=
9600 bps (Default.)
6=
19200 bps
7=
38400 bps or higher
Bits 4-5 Assumed DTE parity
0=
even
1=
not used
2=
odd
3=
none (Default.)
MDM-TEL User Manual
Page 23
Rev 3
Bit 6-7 0=
1=
2=
Guard tone (&Gn)
None (&G0) (Default)
None (&G1)
1800 Hz (&G2)
S27 General Bit Mapped Options for sync/async control(&Mn/&Qn), leased line control(&Ln),
clock select(&Xn), Bell/CCITT mode(Bn)
Bits 0,1,3 Synchronous/asynchronous selection (&Mn/&Qn)
3
1
0
0
0
0
=
&M0 or &Q0
0
0
1
=
&M1 or &Q1
0
1
0
=
&M2 or &Q2
0
1
1
=
&M3 or &Q3
1
0
0
=
&Q4
1
0
1
=
&Q5 (Default.)
1
1
0
=
&Q6
Bit 2 - Leased line control (&Ln)
0=
Dial up line (&L0) (Default.)
1=
Leased line (&L1)
Bits 4,5 Internal clock select (&Xn)
0=
Internal clock (&X0) (Default.)
1=
External clock (&X1)
2=
Slave clock (&X2)
Bit 6 - CCITT/Bell mode select (Bn)
0=
CCITT mode (B0) (Default.)
1=
Bell mode (B1)
Bit 7 – Reserved
S28 General Bit Mapped Options indicates options for pulse dialing(&Pn), MNP Link negotiation
speed(*Hn)
Bits 0-1 Reserved
Bit 2 Reserved (always 0).
Bits 3 -4 Pulse dialing (&Pn)
0=
39%-61% make/break ratio at 10 pulses per second (&P0) (Default.)
1=
33%-67% make/break ratio at 10 pulses per second (&P1)
2=
39%-61% make/break ratio at 20 pulses per second (&P2)
3=
33%-67% make/break ratio at 20 pulses per second (&P3)
Bit 5 Reserved
Bits 6-7 MNP Link Negotiation Speed (*Hn)
0=
Link negotiation at highest speed (*H0) (Default.)
1=
Link negotiation at 1200 bps (*H1)
2=
Link negotiation at 4800 bps (*H2)
s31 General Bit Mapped Options
Bit 0 - Single Line Connect Message Enable/Disable (\Vn)
0=
Messages controlled by S95, Wn, and Vn (\V0) (Default)
1=
Single Line Connect Message (\V1)
MDM-TEL User Manual
Page 24
Rev 3
Bit 1 - Controls auto line speed detection (Nn)
0=
Disabled (N0)
1=
Enabled (N1) (Default.)
Bits 2-3 Controls error correction progress messages (Wn)
0=
DTE speed only (W0) (Default.)
1=
Full reporting (W1)
2=
DCE speed only (W2)
Bit 4-5 Caller ID (#CID)
0=
1=
2=
Bits 6-7 -
Caller ID Disabled (#CID=0) (Default).
Short (formatted) Caller ID enabled (#CID=1).
Long (unformatted) Caller ID enabled (#CID=2).
Reserved(default =11b).
S36 LAPM Failure Control used when register S48=128
Bits 0-2 This value indicates what should happen upon a LAPM failure. These fallback options are
initiated immediately upon connection if S48=128. If an invalid number is entered, the number is accepted
into the register, but S36 will act as if the default value has been entered.
0=
Modem disconnects.
1=
Modem stays on-line and a Direct mode connection is established.
2=
Reserved.
3=
Modem stays on-line and a Normal mode connection is established.
4=
5=
6=
7=
(Default.)
Bits 3-7 -
An MNP connection is attempted and if it fails, the modem disconnects.
An MNP connection is attempted and if it fails, a Direct mode connection is established.
Reserved.
An MNP connection is attempted and if it fails, a Normal mode connection is established.
Reserved
S37 Desired Line Connection Speed (when N1 is set)
Bits 0-4 Desired line connection speed. If an invalid number is entered, the number is accepted into
the register, but S37 will act as if the default value has been entered.
0=
Attempt auto mode connection. If N0 is active, connection is attempted at the most recently
sensed DTE speed (+MS command settings are updated to the appropriate values. If N1 is active,
connection is attempted at the highest possible speed (+MS settings are updated to 11, 1, 300,2880 to
reflect V.34, automode, 300 bps minimum speed, and 28800 bps maximum speed). (Default.)
1-3 = Attempt to connect at 300 bps.
4=
Reserved.
5=
Attempt to connect at V.22 1200 bps.
6=
Attempt to connect at V.22 bis 2400 bps.
7=
Attempt to connect at V.23.
8=
Attempt to connect at V.32 bis/V.32 4800 bps.
9=
Attempt to connect at V.32 bis/V.32 9600 bps.
10 = Attempt to connect at V.32 bis 12000 bps.
11 = Attempt to connect at V.32 bis 14400 bps.
12 = Attempt to connect at V.32 bis 7200 bps.
Bits 5-7 Reserved
MDM-TEL User Manual
Page 25
Rev 3
S39 Flow control bit mapped options
Bits 0-2 Status of command options
0=
No flow control
3=
RTS/CTS (&K3) (Default.)
4=
XON/XOFF (&K4)
5=
Transparent XON (&K5)
6=
Both methods (&K6)
Bits 3-7 Reserved
S40 General Bit Mapped Options Status
Bit 0 - 1MNP Extended Services (-Kn)
0=
Disable extended services (-K0) (Default for non-MNP 10 models.)
1=
Enable extended services (-K1) (Default for MNP 10 models.)
2=
Enable extended services (-K2)
Bit 2- Power Level Adjustment for Cellular Use ()Mn)
0=
Auto-adjustment ()M0) (Default.)
1=
Force adjustment ()M1)
Bits 3-5 Break Handling (\Kn)
0=
\K0
1=
\K1
2=
\K2
3=
\K3
4=
\K4
5=
\K5 (Default.)
Bits 6-7 MNP block size (\An)
0=
64 chars (\A0)
1=
128 chars (\A1) (Default.)
2=
192 chars (\A2)
3=
256 chars (\A3)
S41 General Bit Mapped Options Status
Bits 0 -1 -Compression selection (%Cn)
0=
Disabled (%C0)
1=
MNP 5 (%C1)
2=
V.42 bis (%C2)
3=
MNP 5 and V.42 bis (%C3) (Default.)
Bit 2, 6Auto retrain and fallback/fall forward (%En)
Bit 6 Bit 2
0
0
=
Retrain and fallback/fall forward disabled (%E0) (Default.)
0
1
=
Retrain enabled (%E1)
1
0
=
Fallback/fall forward enabled (%E2)
Bit 3 - Modem-to-modem flow control
0=
Disabled (\G0) (Default.)
1=
Enabled (\G1)
Bit 4 - Block mode control (\Ln)
0=
Stream mode (\L0) (Default.)
1=
Block mode (\L1)
Bit 5 - Reserved
Bit 7 - Enable fallback to V.22bis/V.22 (-Qn)
MDM-TEL User Manual
Page 26
Rev 3
0=
1=
Disabled (-Q0)
Enabled (-Q1) (Default.)
S46 Data Compression Control
S46=136
Execute error correction protocol with no compression.
S46=138
Execute error correction protocol with compression. (Default.)
S48 V.42 Negotiation Control
S48=0 Disable negotiation; bypass the detection and negotiation phases; and proceed with LAPM.
S48=7 Enable negotiation. (Default.)
S48=128 Disable negotiation; bypass the detection and negotiation phases; and proceed at once with the
fallback action specified in S36. Can be used to force MNP.
The following table lists the S36 and S48 configuration settings for certain types of connections.
S86 Call Failure Reason Code
S86=0 Normal disconnect, no error occurred.
S86=4 Loss of carrier.
S86=5 V.42 negotiation failed to detect an error-correction modem at the other end.
S86=9 The modems could not find a common protocol.
S86=12 Normal disconnect initiated by the remote modem.
S86=13 Remote modem does not respond after 10 re-transmissions of the same message.
S86=14 Protocol violation.
S95 Extended Result Codes
Bit 0 - CONNECT result code indicates DCE speed instead of DTE speed.
Bit 1 - Append/ARQ to CONNECT XXXX result code in error-correction mode (XXXX = rate; see Table 1).
Bit 2 - Enable CARRIER XXXX result code (XXXX = rate; see Table 1).
Bit 3 - Enable PROTOCOL XXXX result code (XXXX = protocol identifier; see Table 1).
Bit 4 - Reserved.
Bit 5 - Enable COMPRESSION result code (XXXX = compression type; see Table 1).
Bit 6 - Reserved.
Bit 7 - Reserved.
Section 8
Maintenance Information
Troubleshooting Tips
Default LED Indications
The Industrial Modem has the following LEDs.
MDM-TEL User Manual
Page 27
Rev 3
LED
Default Indication
Carrier Detect
This LED will come ON once a phone line connection has been established,
and will remain on for as long as the connection is maintained.
Data Terminal Ready
This LED should be ON at all times.
Receive Data
This LED will come ON whenever characters are received through the phone
line.
Transmit Data
This LED will come ON whenever the modem sends characters out the phone
line.
Power LED
Normal Indication: This LED will be ON when power is applied to the
modem.
Additional States: A “Slow” blink indicates an invalid configuration. A
“Fast” blink indicates that a self-dial is in process or that the modem is in
“Configure Self-dialing Parameters’ mode.
Note: The RD and TD LEDs indicate the flow of characters in and out of the phone line interface of the modem,
and are not directly connected to the RS232 port.
Reconnecting Serial Cables
It is important to cycle (remove and then reapply) DC power to a modem each time the RS232 cable is disconnected
and then reconnected. The serial port of the modem may not function properly if power is not cycled.
Resetting the modem
If it ever becomes necessary to completely reset the modem including both user profiles to the basic factory default
settings, the following command can be issued:
AT&F&W&W1 [CR]
This command string will load the factory defaults into the active configuration (&F) and then save those settings
into both user profile 0 (&W) and user profile 1 (&W1).
Note that after the modem is reset completely to the factory defaults, it will no longer be set to auto-answer, which is
often necessary for the modem to work when connected to a remote device. Use the Setup Wizard to adjust these
settings appropriately.
MDM-TEL User Manual
Page 28
Rev 3
Section 9
Product Support and Additional Documents
FCC Requirements for Consumer Products
The Federal Communications Commission (FCC) has established rules which permit this device to be
directly connected to the telephone network. Standardized jacks are used for these connections. This
equipment should not be used on party lines or coin lines.
If this device is malfunctioning, it may also be causing harm to the telephone network; this device should
be disconnected until the source of the problem can be determined and until repair has been made. If this
is not done, the telephone company may temporarily disconnect service.
If you have problems with your telephone equipment after installing this device, disconnect the device
from the line to see if it is causing the problem. If it is, contact your supplier or an authorized agent.
The telephone company may make changes in its technical operations and procedures; if such changes
affect the compatibility or use of this device, the telephone company is required to give adequate notice of
the changes.
If the telephone company requests information on what equipment is connected to their lines, inform them
of:
A) The telephone number that it is connected to,
B) The Ringer Equivalence Number 0.3
C) The USOC jack required RJ11, and
D) The FCC Registration Number 34579-MD-E
Items (b) and (d) are indicated on the label. The ringer equivalence number (REN) is used to determine
how many devices can be connected to your telephone line, In most areas, the sum of the RENs of all
devices on any one line should not exceed five (5.0). If too many devices are attached, they may not ring
properly.
In the event of equipment malfunction, all repairs should be performed by our Company or authorized
agent. It is the responsibility of users requiring service to report the need for service to our company or
one of our authorized agents.
AutomationDirect.com
3505 Hutchinson Road
Cumming, GA 30040
Phone: (770) 889-2858
MDM-TEL User Manual
Page 29
Rev 3
Certification Notice for Equipment Used in Canada
The Canadian Department of Communications label identifies certified equipment. This certification means the
equipment meats certain telecommunications-network protective, operation, and safety requirements. The
Department does not guarantee the equipment will operate to the users satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the
local telecommunications company. The equipment must also be installed using an acceptable method of connection.
In some cases, the company’s inside wiring associated with single-line individual service may be extended by means
of a certified connector assembly (extension cord). The customer should be aware that compliance with the above
conditions may not prevent degradation of service in some situations.
Repairs to certified equipment should be made by an authorized Canadian maintenance facility – in this case, your
supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the
telecommunications company cause to request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections of the power utility, telephone
lines, and internal metallic water pipe system, if present, are connected together. The precaution may be particularly
important in rural areas.
Caution:
Users should not attempt to make such connections themselves, but should contact the appropriate electric
inspection authority, or electrician as appropriate.
The LOAD NUMBER (LN) assigned to each terminal device denotes the percentage of the total load to be
connected to a telephone loop which is used by the device, to prevent overloading. The termination on a loop may
consist of any combination of devices, subject only to the requirement that the total of the load numbers of all the
devices does not exceed 100.
MDM-TEL User Manual
Page 30
Rev 3
Federal Communications Commission And Canadian Department of
Communications Radio Frequency Interference Statement
Class b Digital Device. This equipment has been tested and found to comply with the limits for a Class B computing
device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. However, there is no guarantee that interference will not occur in a
particular installation. This equipment generates, uses, and can radiate radio frequency energy, and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio or telephone reception, which
can be determined by turning the equipment on and off. The user is encouraged to try and correct the interference by
one of the following measures:

Reorient or relocate the receiving antenna.

Increase the separation between the equipment and the receiver.

Connect the equipment into an outlet on a different circuit from which the receiver is connected.

Consult an experienced radio/TV technician for help.
Caution:
Changes or modifications not expressly approved by the party responsible for compliance could void the
users authority to operate the equipment.
To meet FCC requirements, shielded cables and power cords are required to connect this device to a personal
computer or other Class B device.
This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in
the Radio Interference Regulation of the Canadian Department of Communications.
MDM-TEL User Manual
Page 31
Rev 3
Regulatory Notices
Any European Country:
The Industrial Modem is in conformity with relevant regulatory standards following the provisions of European Council
Directives: 73/23/EEC (Low Voltage Directive) and 89/336/EEC amended by 92/31/EEC (EMC Directive).
The Industrial Modem has been approved in accordance with Council Decision 98/482/EC for pan-European single terminal
connection to the public switched telephone network (PSTN). However, due to differences between the individual PSTNs
provided in different countries, the approval does not, of itself, give an unconditional assurance of successful operation on every
PSTN network termination point.
Australia:
The Industrial Modem shall be connected to the Telecommunication Network through a line cord, which
meets the requirements of Australian Communications Authority (ACA) Technical Standard TS008. An
Australian Approved Power Supply or AC Adapter shall be utilized with the product.
AS/NZS3548:1995WARNING: This is a Class A product. In a domestic environment, this product may cause radio interference, in which case
the user may be required to take adequate action.
Germany:
Diese als Endeinrichtung vorgesehen und muss an ein TAE mit F-Kodierung angeschlossen werden.
are terminal equipment, which must be connected to the PSTN using an F-coded connector/plug.
IEC950:1991The Industrial Modem shall be connected to Telecommunications Network through a line cord approved by the necessary
authorities of the country. The Industrial Modem shall be utilized with a power supply approved by the necessary authorities of
the country.
United Kingdom:
The Industrial Modem is intended for direct connection to the analogue Public Switched Telecommunications Network and is
approved for use within the United Kingdom with following features:
-Modem facility
-Auto calling facility
-Auto answering facility
-DTMF signaling
CAUTION: The analogue telecommunications interface of the modem is intended to be connected to Telecommunication
Network Voltage (TNV) circuits, which may carry dangerous voltages. If it is subsequently desired to open the host equipment
for any reason, the telephone cord must be disconnected prior to effecting access to any internal parts, which may carry
telecommunication network voltages.
Service can be facilitated through our office at:
AutomationDirect.com
3505 Hutchinson Road
Cumming, GA 30040
Phone: (770) 889-2858
MDM-TEL User Manual
Page 32
Rev 3
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