East Coast Datacom SME-232 RS-232 Modem Eliminator Operations Manual

Below you will find brief information for RS-232 Modem Eliminator SME-232. This device allows two RS-232 DTE devices to communicate within proximity. Data is transmitted bi-directionally at data rates up to 128Kbps. The SME-232 provides an internal baud rate generator with user defined clock rates from 1200bps up to 128Kbps. It features two female DB-25-P connectors for easy connection.

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TABLE OF CONTENTS
CHAPTER 1 - INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 1
1.1
FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 1
CHAPTER 2 - BASIC OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
2.1
FRONT PANEL INDICATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
2.2
REAR PANEL CONNECTORS AND FUSES . . . . . . . . . . . . . . . . . . . . . . . . Page 2
2.3
CLOCKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
2.4
ELECTRICAL INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
2.5
CTS FOLLOWS RTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
2.5.1 RTS TO CTS DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
CHAPTER 3 - INSTALLATION
Page 3
3.1
VOLTAGE SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3
3.2
VOLTAGE SELECTION FUSES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3
3.3
POWER CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3
3.4
DEFAULT CONFIGURATION SWITCH SETTINGS . . . . . . . . . . . . . . . . . . Page 4
3.5
TERMINAL (DTE) CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
3.6
INTERNAL SWITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
3.6.1 DIP SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
3.6.2 SWITCH FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
4.0 - APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7
4.1
RS-232 INTERFACE CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7
OPERATIONS MANUAL
RS-232 SYNCHRONOUS MODEM ELIMINATOR
MODEL: SME-232
22 January, 2000
FOR TECHNICAL SUPPORT CALL:
East Coast Datacom, Inc.
245 Gus Hipp Blvd., STE 3
Rockledge, FL 32955
TEL: (800) 240-7948 or (321) 637-9922
FAX: (321) 637-9980
Email: [email protected]
Web Site: www.ecdata.com
Manufactured By:
East Coast Datacom, Inc.
PT # 719009-A
East Coast Datacom, Inc. SME-232 OPERATIONS MANUAL
SAFETY WARNING
Always observe standard safety precautions during installation, operation and
maintenance of this product. To avoid the possibility of electrical shock, be sure to
disconnect the power cord from the power source before you remove the IEC power
fuses or perform any repairs.
PROPRIETARY NOTICE
The information contained herein is proprietary to East Coast Datacom, Inc. Any
reproduction or redistribution of this publication, in whole or in part, is expressly
prohibited unless written authorization is provided by East Coast Datacom, Inc.
WARRANTY NOTICE
WARRANTIES: East Coast Datacom, Inc. (hereafter referred to as E.C.D.) warrants
that its equipment is free from any defects in materials and workmanship. The warranty
period shall be three (3) years from the date of shipment. E.C.D.'s sole obligation under
its warranty is limited to the repair or replacement of defective equipment, provided it is
returned to E.C.D., transportation prepaid, within a reasonable period. This warranty
will not extend to equipment subjected to accident, misuse, alterations or repair not
made by E.C.D. or authorized by E.C.D. in writing.
PUBLICATION NOTICE
This manual has been compiled and checked for accuracy. The information in this
manual does not constitute a warranty of performance. E.C.D. reserves the right to
revise this publication and make changes from time to time in the content thereof.
E.C.D. assumes no liability for losses incurred as a result of out-of-date or incorrect
information contained in this manual.
East Coast Datacom, Inc. SME-232 OPERATIONS MANUAL
CHAPTER 1 - INTRODUCTION
1.1
FUNCTIONAL DESCRIPTION
The SME-232 allows two RS-232 DTE devices to communicate within proximity of each
other. The SME-232 transmits data bi-directionally at data rates up to 128Kbps between
DTE devices. All clocking and signal crossover are provided within the SME-232. The
unit is equiped with two female DB-25-P connectors.
The SME-232 is an excellent choice for interconnecting your LAN or mainframe
equipment. Substantial cost savings are derived by eliminating the need for Modems or
Line Drivers.
Installation is fast and simple by setting the internal switches for Clocking and RTS to
CTS delay. The SME-232 has status LED's for each attached DTE device which allows
the user to visually confirm the presence of control signals.
The SME-232 utilizes state of the art digital CMOS technology to provide a feature filled
product at a very affordable price. Our Field Programmable Gate Array (FPGA) design
has allowed us to offer this product with a wide selection of user Baud Rates. This
design approach has also eliminated clock jitter for high speed 128Kbps transmissions.
The SME-232 is housed in a sturdy metal enclosure and operates on 110/220VAC.
Typical MTBF figures are in excess of 100,000 hours of operation.
RS-232 CABLES
MAINFRAME
OR ROUTER
SME-232
SPEEDS TO 128Kbps
TYPICAL APPLICATION
Figure 1.1
Page 1
MAINFRAME
OR ROUTER
East Coast Datacom, Inc. SME-232 OPERATIONS MANUAL
CHAPTER 2 - BASIC OPERATION
2.1
FRONT PANEL INDICATORS
A Green LED marked PWR illuminates when AC Power has been applied. Two
adjacent sets of Green LEDs illuminate in union with individual DTE port control signal
activity.
2.2
REAR PANEL CONNECTORS AND FUSES
Located on the back or rear of the product you will find an IEC Power receptacle. The
supplied power cord plugs into this receptacle. This receptacle also contains a fuse
drawer. Two (2) fuses are located in this compartment. For 110 VAC +/- 10%
operation the unit is equipped with slow blow 160ma Fuses, Part # 714000. For 220
VAC +/- 10% operation the unit is equipped with slow blow 80ma Fuses, Part # 714001.
Additionally, DB-25 female connectors, marked PORT A and PORT B.
2.3
CLOCKING
The SME-232 provides an internal baud rate generator with user defined clock rates
from 1200bps up to 128Kbps.
2.4
ELECTRICAL INTERFACE
The SME-232 is EIA RS-232-C compliant utilizing the international EIA specification.
The unit is equiped with female DB-25-P connectors. Refer to the interface chart in the
Appendix for detailed interface information.
2.5
CLEAR TO SEND (CTS) FOLLOWS REQUEST TO SEND (RTS)
The SME-232 has individual settings for each user port so that CTS follows RTS.
2.5.1 REQUEST TO SEND (RTS) DELAY
The SME-232 has individual user port settings for RTS delay. Options of no delay,
6ms, 12ms and 24ms are provided.
Page 2
East Coast Datacom, Inc. SME-232 OPERATIONS MANUAL
CHAPTER 3 - INSTALLATION
CAUTION: Disconnect Power Before Servicing
ATTENTION: Couper Le Courant Avant l' Entretien
VORSICHT: Befor Deckung Abnehmen Mach Strom Zu
3.1
VOLTAGE SELECTION
It is very important to check that the unit is set to the correct voltage setting for your
application before applying AC power. Located on the rear of the unit you will find a
rotary 110/220 VAC switch. Using a coin or small screwdriver, gently turn the switch to
the appropriate power position as required for your installation (110 or 220 VAC).
3.2
VOLTAGE SELECTION FUSES
Located on the back or rear of the product you will find an IEC Power receptacle. This
receptacle contains a fuse drawer. Two (2) fuses are located in this compartment. For
110 VAC +/- 10% operation the unit is equipped with slow blow 5 x 20mm 160ma
Fuses, E.C.D. Part # 714000. For 220 VAC +/- 10% operation the unit is equipped with
slow blow 5 x 20mm 80ma Fuses, E.C.D. Part # 714001. Spare fuses may be
purchased by calling East Coast Datacom or by calling the fuse manufacturer: Little
Fuse at (312) 824-3024 or Shurter, Inc. at (707) 778-6311
Little Fuse Part #'s are: 160ma = 218.160 and 80ma = 218.080
Shurter, Inc. Part #'s are: 160ma = 034.3109 and 80ma = 034.3106
3.3
POWER CONNECTION
Before connecting the SME-232 to an AC power source the top cover should be
installed with the supplied #4-40 screws. AC power is supplied to the unit through a
2.3m (6.6 ft) cord terminated by a grounded 3-prong plug. Select an appropriate
location accessible to and within four to five feet of an AC outlet. The AC Power source
MUST be grounded or the units Warranty will be void.
Power Connection
Figure 3-1
Page 3
East Coast Datacom, Inc. SME-232 OPERATIONS MANUAL
3.4
DEFAULT CONFIGURATION SWITCH SETTINGS
The SME-232 is configured prior to shipping with the Dip Switches set as follows:
1) Clock Rate - 1200bps
2) Port A / Port B RTS - Follows CTS
3) Port A / Port B CTS delay - No Delay
4) Chassis to Signal GND - Not Connected
If your system application requires one or more of the default setting to be changed, it
will be necessary to remove the top cover. Disconnect the AC Power source before
servicing the unit. Removal of the top cover is accomplished by using a small Philips
screwdriver and removing the four outside screws. After setting the switches, replace
the top cover before applying AC power.
3.5
TERMINAL (DTE) CONNECTION
Before applying AC Power to the unit, the DCE and DTE cabling should be connected.
Straight through Male to Male DB-25 shielded cables, no longer than 50 feet in any
direction should be used. If your cables are not shielded or over 50 feet long,
transmission errors may occur.
3.6
INTERNAL SWITCH SETTINGS
3.6.1 DIP SWITCHES
The SME-232 has two Dip Switch's that are accessible by removing the Top Cover.
Located safely inside the unit, you will find a 4 position Dip Switch marked S1 and a 10
position Dip Switch marked S2. To change the settings, you may use your finger tip or
a small nonconductive instrument. It is recommended NOT to use metal objects to
push on the Dip Switches, as you may slip and damage a component trace.
3.6.2 SWITCH FUNCTIONS
The following two pages provide a chart for the SME-232 switches and the function of
each switch. Please refer to this chart for all settings.
Page 4
East Coast Datacom, Inc. SME-232 OPERATIONS MANUAL
SME-232 STRAPPING CHART
BAUD RATE SELECTION
SME-232 STRAPPING CHART
Switch
S1
S4
S3
S2
BRG= Baud Rate Generator
S1
Internal
Baud Rate Generator
off
off
off
off
off
off
off
off
on
on
on
on
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
on
on
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
-
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Clock =
Page 5
1200Hz
2400Hz
4800Hz
7200Hz
9600Hz
14.4KHz
19.2KHz
28.8KHz
38.4KHz
48KHz
56KHz
57.6KHz
64KHz
72KHz
115.2KHz
128KHz
East Coast Datacom, Inc. SME-232 OPERATIONS MANUAL
Switch
S2
S10
S9
S8
Not
Port B
used
CTS Delay
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
V
off
off
on
on
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
V
off
on
off
on
S7
S6
Port B Port B
CTS
Clock
S5
S4
S2
S1
Not
Port A
S3
Port A
Port A
Used
CTS Delay
CTS
Clock
|
|
|
|
|
off - Port A clocks from BRG
|
|
|
|
|
on - Port A clocks from Port A external
|
|
|
|
V
|
|
|
|
off
- CTS follows RTS according to S4, S3
|
|
|
|
on
- CTS is forced on
|
|
V
V
|
|
off
off
- no delay from RTS
|
|
off
on
- 6 mS delay from RTS
|
|
on
off
- 12 mS delay from RTS
|
|
on
on
- 24 mS delay from RTS
|
V
|
off - Port B clocks from BRG
|
on - Port B clocks from Port A external
V
off - CTS follows RTS according to S9, S8
on - CTS is forced on
- no delay from RTS
- 6 mS delay from RTS
- 12 mS delay from RTS
- 24 mS delay from RTS
Port A straps
- Port A DSR follows Port B DTR
Jumper Pos 1
Pos 2
- Port A DSR forced on
J3
Jumper Pos 1
Pos 2
J4
- Port A DCD enabled follows Port B RTS
- Port A DCD forced on
Jumper Pos 1
Pos 2
J5
- Port A Ring Indicate follows Port A DCD (see J6)
- Port A Ring Indicate forced on
Port B Straps
- Port B DSR follows Port A DTR
Jumper Pos 1
Pos 2
- Port B DSR forced on
J6
Jumper Pos 1
Pos 2
J7
- Port B DCD enabled follows Port A RTS
- Port B DCD forced on
Jumper Pos 1
Pos 2
J8
- Port B Ring Indicate follows Port B DCD (see J9)
- Port B Ring Indicate forced on
General
Jumper Pos 1
Pos 2
J9
- Signal Ground connected to Frame Ground
- Signal Ground isolated from Frame Ground
Page 6
East Coast Datacom, Inc. SME-232 OPERATIONS MANUAL
4.0 - APPENDIX
4.1
RS-232 INTERFACE CHART
Pin No.
1
2
CCITT
Circuit Signal Description
Circuit
Name
No.
----Shield
103
BA
Send Data
To DTE
To DCE
---
--X
3
104
BB
Receive Data
4
105
CA
Request To Send
5
106
CB
Clear To Send
X
6
107
CC
DCE Ready
X
7
8
102
109
AB
CF
15
114
DB
Signal Ground
Receive Line
Detector
Send Timing
17
115
DD
Receive Timing
20
108.2
CD
Terminal Ready
22
125
CE
Ring Indication
24
113
DA
External Timing
Page 7
X
X
--X
---
X
X
X
X
X
5.0 - TECHNICAL SPECIFICATIONS
Application
Weight
Interconnection of two RS-232 DTE (Terminal)
devices located within proximity of each other
2 pounds (0.914Kg)
Capacity
Warranty
Two (2) RS-232 DTE's
Interface
RS-232 using EIA specification
Data Rates
1200bps to 128Kbps
Channel Interface
Two Female DB-25 Connectors
Surge Protection
Main power supply
Power Source
100-120 to 200-220VAC @10%, 50/60Hz,
0.16/0.08A, external 110/220 volt select
switch, IEC Power Inlet, (2) 5mm Fuses
Three Years, Return To Factory
ORDERING INFORMATION
Part Number: 120000
Model: SME-232
Description: RS-232 Modem Eliminator,
Speeds to 128kbps
INCLUDED WITH EACH UNIT:
1) Operations Manual
2) U.S.A. Grounded Power Cord, Part # 713015
3) Optional Power Cords
A) United Kingdom, Part # 713016
B) Continental Europe, Part # 713017
C) Other: Specify Country on Purchase Order
OPTIONAL ACCESSORIES
1) Spare Data Center Fuses
A) 160ma Fuse, Qty (2) Part # 714000
B) 80ma Fuse, Qty (2) Part # 714001
For further detailed technical information on this
product, contact East Coast Datacom Technical
Assistance toll free at (800) 240-7948
Environmental
OTHER EAST COAST DATACOM PRODUCTS
Operating Temperature....32&ordm; to 122&ordm; F (0&ordm;
to 50&ordm; C)
Relative Humidity.............5 to 95%
Non-Condensing
Altitude............................0 to 10,000 feet
MODEM AND PORT SHARING DEVICES
INTERFACE CONVERTERS
SIGNAL SPLITTERS
LINE DRIVERS
Dimensions
Height ....... 1.75 inches (4.44 cm)
Width ........ 7.90 inches (20.07 cm)
Length ....... 9.00 inches (22.86 cm)
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Key Features

Transmits data bi-directionally
Data rates up to 128Kbps
Internal baud rate generator
User defined clock rates
Two female DB-25-P connectors
Two (2) RS-232 DTE's
EIA RS-232-C compliant
LED's for visual confirmation
Housed in a sturdy metal enclosure
Operates on 110/220VAC

Frequently Answers and Questions

What is the purpose of the SME-232?

The SME-232 allows two RS-232 DTE (Terminal) devices to communicate within proximity of each other. It eliminates the need for Modems or Line Drivers.

What is the maximum data rate of the SME-232?

The SME-232 transmits data bi-directionally at data rates up to 128Kbps.

What voltage settings are available for the SME-232?

The SME-232 operates on 110/220VAC and has a rotary switch to select the appropriate voltage setting.

How do I configure the SME-232 for different baud rates and other settings?

The SME-232 has internal dip switches that allow you to configure the baud rate, RTS to CTS delay, and other settings. You can access these switches by removing the top cover.