Westermo TD-23 LV Multidrop modem User guide
Westermo TD-23 LV is a reliable and functional leased line V.23 modem designed for industrial environments. It supports point-to-point or multidrop applications with up to 16 units over distances of up to 25 km. The modem features adjustable output signal level, reception sensitivity, and transient protection on the line side. It has a wide power input range (10-60 VDC or 10-30 VAC) and provides galvanic isolation between the line and supply. Additionally, it offers an optional relay output reflecting the transmitter carrier for monitoring purposes.
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TD-23
Leased Line
V.23 Modem
Multidrop applications
www.westermo.com
2 6600-2204
General information
Legal information
The contents of this document are provided “as is”. Except as required by applicable law, no warranties of any kind, either express or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose, are made in relation to the accuracy and reliability or contents of this document. Westermo reserves the right to revise this document or withdraw it at any time without prior notice.
Under no circumstances shall Westermo be responsible for any loss of data or income or any special, incidental, and consequential or indirect damages howsoever caused.
More information about Westermo can be found at the following Internet address: www.westermo.com
6600-2204 3
4
Safety
!
!
Before installation:
This modem is for restricted access area use only.
Read this manual completely and gather all information on the unit. Make sure that you understand it fully. Check that your application does not exceed the safe operating specifications for this unit.
This unit should only be installed by qualified personnel.
This unit should be built-in to an apparatus cabinet, or similar, where access is restricted to service personnel only.
The power supply wiring must be sufficiently fused, and if necessary it must be possible to disconnect manually from the power supply. Ensure compliance to national installation regulations.
This unit uses convection cooling. To avoid obstructing the airflow around the unit, follow the spacing recommendations (see Cooling section).
Before mounting, using or removing this unit:
Prevent access to hazardous voltage by disconnecting the unit from power supply.
Warning! Do not open connected unit. Hazardous voltage may occur within this unit when connected to power supply.
Care recommendations
Follow the care recommendations below to maintain full operation of unit and to fulfil the warranty obligations.
This unit must not be operating with removed covers or lids.
Do not attempt to disassemble the unit. There are no user serviceable parts inside.
Do not drop, knock or shake the unit, rough handling above the specification may cause damage to internal circuit boards.
Do not use harsh chemicals, cleaning solvents or strong detergents to clean the unit.
Do not paint the unit. Paint can clog the unit and prevent proper operation.
Do not expose the unit to any kind of liquids (rain, beverages, etc). The unit is not waterproof. Keep the unit within the specified humidity levels.
Do not use or store the unit in dusty, dirty areas, connectors as well as other mechanical part may be damaged.
If the unit is not working properly, contact the place of purchase, nearest Westermo distributor office or Westermo Tech support.
Maintenance
No maintenance is required, as long as the unit is used as intended within the specified conditions.
6600-2204
Product disposal
This symbol means that the product shall not be treated as unsorted municipal waste when disposing of it. It needs to be handed over to an applicable collection point for recycling electrical and electronic equipment.
By ensuring this product is disposed of correctly, you will help to reduce hazardous substances and prevent potential negative consequences to both environment and human health, which could be caused by inappropriate disposal.
6600-2204 5
Simplified EU declaration of conformity
Hereby, Westermo declares that the equipment is in compliance with EU directives. The full EU declaration of conformity and other detailed information are available at the respective product page at www.westermo.com.
Agency approvals and standards compliance
Type
EMC
Approval / Compliance
EN 61000-6-1, Immunity residential environments
EN 61000-6-2, Immunity industrial environments
EN 61000-6-3, Emission residential environments
EN 61000-6-4, Emission industrial environments
IEC 62236-4, Railway signalling and telecommunications apparatus
Safety EN 60950-1, IT equipment*
*Only applicable to article nr. 3600-2101
FCC Part 15.105 Notice: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against harmful interference in a residential 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 communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
… Reorient or relocate the receiving antenna
… Increase the separation between the equipment and receiver
… Connect the equipment into an outlet on a circuit different from that to which the receiver is connected
… Consult the dealer or an experienced radio/TV technician for help.
6 6600-2204
Type tests and environmental conditions
Electromagnetic Compatibility
Phenomena Test
ESD EN 61000-4-2
RF field AM modulated
RF field 900 MHz
Fast transient
Surge
RF conducted
IEC 61000-4-3
ENV 50204
EN 61000-4-4
EN 61000-4-5
EN 61000-4-6
EN 61000-4-8
Description
Enclosure contact
Test levels
± 6 kV
Enclosure air
Enclosure
± 8 kV
6 V/m 80% AM (1 kHz) 2000 – 2700 MHz
10 V/m 80% AM (1 kHz), 80 – 1000 MHz
20 V/m 80% AM (1 kHz), 80 – 2000 MHz
20 V/m pulse modulated 200 Hz, 900 ± 5 MHz Enclosure
Signal ports
Power ports
± 2 kV
± 2 kV
Signal ports unbalanced ± 2 kV line to earth, ± 2 kV line to line
Signal ports balanced ± 2 kV line to earth, ± 1 kV line to line
Power ports
Signal ports
Power ports
Enclosure
± 2 kV line to earth, ± 2 kV line to line
10 V 80% AM (1 kHz), 0.15 – 80 MHz
10 V 80% AM (1 kHz), 0.15 – 80 MHz
100 A/m, 50 Hz, 16.7 Hz & 0 Hz Power frequency magnetic field
Pulse magnetic field
Voltage dips and interruption
EN 61000-4-9
EN 61000-4-11
Enclosure
AC power ports
Mains freq. 50 Hz
Mains freq. 50 Hz
Voltage dips and interruption
Radiated emission
Conducted emission
Dielectric strength
EN 61000-4-16
SS 436 15 03
EN 61000-4-29
CISPR 16-2-3
ANSI C63.4
(FCC part 15)
CISPR 16-2-1
ANSI C63.4
(FCC part 15b)
EN 60950
Signal ports
Signal ports
DC power ports
Enclosure
AC power ports
AC power ports
DC power ports
Signal port to other isolated ports
Power port to other isolated ports
300 A/m, 6.4 / 16 µs pulse
10, 20, 5000 ms interruption
10 & 500 ms, 30% reduction
200 ms, 60% reduction
100 V 50 Hz line to earth
250 V 50 Hz line to line
10 & 100 ms, interruption
500 ms, 30% reduction
10 ms, 60% reduction
+20% above & –20% below rated voltage
Class B
Class B
Class B
Class B
Class B
2 kVrms 50 Hz 1 min
3 kVrms 50 Hz 1 min
2 kVrms 50 Hz 1 min (@ rated power <60 V)
Environmental
Temperature EN 60068-2-1
EN 60068-2-2
Humidity
Altitude
Service life
Vibration
EN 60068-2-30
IEC 60068-2-6
IEC 60068-2-27
Operating
Storage & Transport
Operating
Storage & Transport
Operating
Operating
Operating
Operating
–25 to +70°C
–30 to +70°C
5 to 95% relative humidity
5 to 95% relative humidity
2 000 m / 70 kPa
10 year
7.5 mm, 5 – 8 Hz
2 g, 8 – 500 Hz
15 g, 11 ms Shock
Packaging
Enclosure
Dimension W x H x D
Weight
Degree of protection
Cooling
Mounting
UL 94
IEC 529
PC / ABS
Enclosure
Flammability class V-1
55 x 100 x 132 mm
0.25 kg
IP 20
Convection
Horizontal on 35 mm DIN-rail
6600-2204 7
Description
TD-23 is designed to satisfy industry's demands on reliability and functionality in environments with high levels of interference.TD-23 communicates via a 2- or 4-wire leased line according to the V.23 standard. Equipment with an RS-232 or RS-422/485 interface can be connected and communicate point-to-point or in a multidrop application.The modem is equipped with DIP-switches to set specific functions in hardware, for example, reception sensitivity, output signal level, etc.
This is of particular importance as it allows each modem to be optimised according to the line quality. A general calculation allows 16 units over a distance of up to 25 km (15.5 miles).
TD-23 is intended for mounting on a 35 mm DIN-rail, where the modem is attached and locked in a single action.
… Data rate 1200 bit/s (V.23)
… 2-wire (half duplex), 4-wire (full duplex)
… Number of multidrop points, 16 (typical value)
… Transmission distance up to 25 km (15.5 miles)
… Adjustable output signal level
… Adjustable reception sensitivity
… Transient protection on the line side
… AC-/DC-supply
… Galvanic isolation (line/supply)
… Optional relay output reflecting the transmitter carrier
8 6600-2204
Functional description
Block diagram
Modulated data
GND
VCC
Line relay
GND
Selectable output level
Modem
2 or
4-wire
Analog filter
Selectable input sensitivity
Frequency modulation
Frequency demodulation
Processor
Data buffer
Data buffer
Modem chip control
OR
DSR RTS CTS DCD RD TD
RS-232
TD RD
RS-422/485
GND
DIP-switches
Relay output
6600-2204 9
Interface specifications
Power LV
Rated voltage
Operating voltage
Rated current
Rated frequency
Inrush current I²t
Startup current*
Polarity
Isolation to
Connection
Connector size
Shielded cable
12 to 48 VDC 12 to 27 VAC
10 to 60 VDC 10 to 30 VAC
125 mA @ 12 VDC
50 mA @ 24 VDC
28 mA @ 48 VDC
125 mA @ 12 VAC
50 mA @ 24 VAC
25 mA @ 32 VAC
DC / AC 48 – 62 Hz
0.09 A²s
0.35 A peak
Polarity independent
RS-232 / RS-422/485 / Leased Line
Detachable screw terminal
0.2 – 2.5 mm² (AWG 24-12)
Not required
Power HV
Rated voltage
Operating voltage
Rated current
Rated frequency
Inrush current I²t
Startup current
Polarity
Isolation to
Connection
Connector size
Shielded cable
110 to 250 VDC
95 to 240 VAC
88 to 300 VDC
85.5 to 264 VAC
10 mA @ 110 VDC
7 mA @ 250 VDC
30 mA @ 95 VAC
23 mA @ 240 VAC
DC / 48 – 62 Hz
0.05 A²s
0.03 A peak
Polarity independent
RS-232 / RS-422/485 / Leased Line
Detachable screw terminal
0.2 – 2.5 mm² (AWG 24-12)
Not required
10 6600-2204
RS-422/485
Electrical specification
Data rate
Data format
Protocol
Retiming
Turn around time
Transmission range
Settings
Protection
Isolation to
Connection
Connector size
Shielded cable
EIA RS-485
2-wire or 4-wire twisted pair
300 bit/s – 1200 bit/s
7 or 8 data bits, Odd, even or none parity, 1 or 2 stop bits;
Σ 9-12 bits
Transparent
No
4.2 ms (half duplex)
≤ 1200 m, depending on data rate and cable type (EIA RS-485)
120 Ω termination and failsafe biasing 680 Ω
Installation Fault Tolerant (up to ±60 V)
Power / Leased Line
Detachable screw terminal
0.2 – 2.5 mm² (AWG 24 – 12)
Not required*
RS-232 lectrical specification
Data rate
Data format
Protocol
Retiming
Transmission range
Isolation to
Connection
Connector size
Shielded cable
Conductive housing
EIA RS-232
300 bit/s – 1200 bit/s
7 or 8 data bits, Odd, even or none parity, 1 or 2 stop bits;
Σ 9-12 bits
Transparent
No
15 m
Power / Leased Line
9-pin D-sub female (DCE) or Detachable screw terminal (DCE)
0.2 – 2.5 mm² (AWG 24 – 12)
Not required*
Isolated to all other housings
* Railway installation close to the rails.
For a cable located inside 3 m boundary and connected to this port, the use of shielded cable is recommended, this is to minimise the risk of interference. The cable shield should be properly connected (360°) to an earthing point within 1 m from this port. This earthing point should have a low impedance connection to the conductive enclosure of the apparatus cabinet, or similar, where the unit is built-in. This conductive enclosure should be connected to the earthing system of an installation and may be directly connected to the protective earth.
6600-2204 11
Relay (optional)
Rated voltage
Operating voltage
Contact rating
Contact resistance
Transmission range
Function
Isolation to
Connection
Connector size
Shielded cable
Leased Line
Electrical specification
Data rate
Transmission level
Sensitivity reseption
Protocol
Turn around time
Transmission range / Budget
Protection
Isolation to
Connection
Connector size
Shielded cable
Up to 48 VDC
Up to 60 VDC
50 mA @ 48 VDC
8 Ω
≤ 3 m, depending on data rate and cable type
The output follows the transmit carrier, I.e. output shorted when carrier is ON.
Power, Leased Line, RS-232, RS-485/422
Detachable screw terminal
0.2 – 2.5 mm² (AWG 24 – 12)
Not required
2- or 4-wire Leased Line
300 bit/s – 1200 bit/s
+3, –3, –6, –9, –10, –12, –13, –15 dBm
Transmision levels above –9 dBm are not allowed on
PTT networks only on private wires
–45, –33, –27, –23 dBm
V23hdx, V23fdx
33 ms (half duplex)
30dB
Installation Fault Tolerant (up to ±60 V)
Power / RS-232 / RS-422/485
Detachable screw terminal
0.2 – 2.5 mm² (AWG 24 – 12)
Not required
12 6600-2204
Location of Interface ports, LED’s and DIP-switches
TD-23 HV
RS-422/485
9-pos. Direction* Description
No 9
No 8
No 7
No 6
In
In
Out
In/Out
Out
In/Out
R+ (A’) Receive
RS-422/485 4-wire
R– (B’) Receive
RS-422/485 4-wire
T+ (A) Transmit
RS-422/485 4-wire
T+/R+ (A/A’) Transmit/Receive
RS-422/485 2-wire
T– (B) Transmit
RS-422/485 4-wire
T–/R– (B/B’) Transmit/Receive
RS-422/485 2-wire
Product marking
R+
R–
T+
T–
Relay (optional)
Position Direction* Description
No. 1 Out Normal open
No. 2 Out Common
Leased Line
Fore details, se below
RS-232 (DTE)
Position
D-sub
Screw terminal
No. 1
No. 2
No. 3
No. 4
No. 4
No. 3
No. 5
No. 6
No. 7
No. 8
No. 9
No. 5
Direction* Description
–
Out
In
Out
NC
Out
Out
In
NC
Data Carrier Detect (DCD)
Received Data (RD)
Transmitted Data (TD)
Data Terminal Ready (DTR)
Signal Ground (SG)
Data Set Ready (DSR)
Request To Send (RTS)
Clear To Send (CTS)
Ring Indicator (RI)
D-sub description
3
4
1
2
5
8
9
6
7
Power connection HV
Pos.
Direction* Description
Product marking
L
N
In
In
–
AC: Live
DC: +Voltage
AC: Neutral
DC: –Voltage
Not used
Leased Line
RS-232 (DTE)
Fore details, se below
Power connection HV
Fore details, se below
Pos.
Direction* Description
No. 1
No. 2
No. 3
No. 4
Out
In/Out
Out
In/Out
In
In
4-wire Transmit
2-/4-wire
Receive/ Transmit
4-wire Transmit
2-/4-wire
Receive/ Transmit
4-wire Receive
4-wire Receive
Product marking
TX
RX
* Direction relative this unit. NC = Not Connected
6600-2204 13
Location of Interface ports, LED’s and DIP-switches
TD-23 LV
RS-422/485
9-pos. Direction* Description
No 9
No 8
No 7
No 6
In
In
Out
In/Out
Out
In/Out
R+ (A’) Receive
RS-422/485 4-wire
R– (B’) Receive
RS-422/485 4-wire
T+ (A) Transmit
RS-422/485 4-wire
T+/R+ (A/A’) Transmit/Receive
RS-422/485 2-wire
T– (B) Transmit
RS-422/485 4-wire
T–/R– (B/B’) Transmit/Receive
RS-422/485 2-wire
Product marking
R+
R–
T+
T–
Relay (optional)
Position Direction* Description
No. 1 Out Normal open
No. 2 Out Common
RS-232 (DTE)
Position
D-sub
Screw terminal
No. 1
No. 2
No. 3
No. 4
No. 4
No. 3
No. 5
No. 6
No. 7
No. 8
No. 9
No. 5
Direction* Description
–
Out
In
Out
NC
Out
Out
In
NC
Data Carrier Detect (DCD)
Received Data (RD)
Transmitted Data (TD)
Data Terminal Ready (DTR)
Signal Ground (SG)
Data Set Ready (DSR)
Request To Send (RTS)
Clear To Send (CTS)
Ring Indicator (RI)
3
4
1
2
5
8
9
6
7
Leased Line
Fore details, se below
D-sub description
Power connection LV
Pos.
Direction* Description
Product marking
No. 1
No. 2
In
In
AC: Neutral
DC: –Voltage
AC: Line
DC: +Voltage
Leased Line
RS-232 (DTE)
Fore details, se below
Power connection LV
Fore details, se below
Pos.
Direction* Description
No. 1
No. 2
No. 3
No. 4
Out
In/Out
Out
In/Out
In
In
4-wire Transmit
2-/4-wire
Receive/ Transmit
4-wire Transmit
2-/4-wire
Receive/ Transmit
4-wire Receive
4-wire Receive
Product marking
TX
RX
* Direction relative this unit. NC = Not Connected
14 6600-2204
LED Indicators
LED
PWR
Power
Status Description
ON In service
RD
Receive data
OFF
ON
Out of service
Data transmitted on the RS-232 or RS-485 port
TD
Transmit data
OFF
ON
No data transmitted on the RS-232 or RS-485 port
Data received on the RS-232 or RS-485 port
RTS
Request to send
OFF
ON
No data received on the RS-232 or RS-485 port
RTS signal active on the RS-232 port
CTS
Clear to send
OFF
ON
RTS signal inactive on the RS-232 port
CTS signal active on the RS-232 port
DCD
Data carrier detect
OFF
ON
OFF
CTS signal inactive on the RS-232 port
DCD signal active on the RS-232 port
DCD signal inactive on the RS-232 port
PWR
RD
TD
RTS
CTS
DCD
6600-2204 15
DIP-switch settings
!
Before DIP-switch settings:
Prevent damage to internal electronics from electrostatic discharges (ESD) by discharging your body to a grounding point (e.g. use of wrist strap).
NOTE DIP-switch alterations are only effective after a power on.
S1 S2 S3
S1 DIP-switch
Selection of transmission level
ON
1 2 3 4 5 6 7 8
3 dBm
ON
1 2 3 4 5 6 7 8
–9 dBm
ON
1 2 3 4 5 6 7 8
–3 dBm
ON
1 2 3 4 5 6 7 8
–6 dBm
ON
1 2 3 4 5 6 7 8
–10 dBm
ON
1 2 3 4 5 6 7 8
–12 dBm
ON
1 2 3 4 5 6 7 8
–13 dBm
ON
1 2 3 4 5 6 7 8
–15 dBm
Selection of transmission level specifies the maximum output power level. The maximum value is 3 dBm. By selecting the higher transmission levels communication over longer distances can be achieved, but the noise and disturbance levels will increase. We recommend that you try your system with the factory default setting first. If disturbances are detected (faulty characters or other errors) decrease the power level step by step.
If the transmission fails because of a weak signal the transmission level can be increased step by step until a satisfactory transmission quality is achieved. Please note that levels above –9 dBm are not allowed on PTT networks and can only be used on private wires!
16 6600-2204
S1 DIP-switch
Selection of minimum level detection DCD
ON
1 2 3 4 5 6 7 8
–45 dBm
ON
1 2 3 4 5 6 7 8
–27 dBm
ON
1 2 3 4 5 6 7 8
–33 dBm
ON
1 2 3 4 5 6 7 8
–23 dBm
Selection of minimum level, DCD detection specifies the minimum power level the receiver can handle. With the receiver having a dynamic range of 30 dBm, this means that with the level set to –15 dBm the TD-23 will pick up signals in the range –15 dBm to –45 dBm. We recommend that you try your network with the factory settings.
If disturbances are detected (faulty characters or other errors) decrease the level step by step. If there is no communication because of a weak signal the receiver sensitivity can be increased step by step until satisfactory transmission quality is achieved.
S1 DIP-switch
2 or 4 Wire Line side
ON
1 2 3 4 5 6 7 8
4-wire
ON
1 2 3 4 5 6 7 8
2-wire
S1 DIP-switch
Carrier active using RTS or incoming data
ON
1 2 3 4 5 6 7 8
RTS
ON
1 2 3 4 5 6 7 8
Incoming data
ON
1 2 3 4 5 6 7 8
Permanent carrier
If the DTE uses the control signal- (RTS) the RTS signal is used to activate the transmitter. If the DTE does not control RTS or if RS-485 is used then the transmitter is activated by incoming data. In this case the data is buffered in the TD-23 while the carrier is established. By setting RTS always active a permanent carrier will be established.
This is the typical setting for a full duplex 4-wire communication.
6600-2204 17
S2 DIP-switch
Selection of 2/4 wire RS-422/485 side
ON
1 2 3 4 5 6 7 8
2-wire
ON
1 2 3 4 5 6 7 8
4-wire
ON
1 2 3 4 5 6 7 8
Deactivate
RS-422/485
All RS-422/485 lines should be terminated at the end-points. The RS-422/485 interface also has a fail-sate circuit which forces a non-active line into idle state.
S2 DIP-switch
RTS-CTS delay, 23 or 60 ms
ON
1 2 3 4 5 6 7 8
60 ms
ON
1 2 3 4 5 6 7 8
23 ms
When a 23 ms delay is chosen, the modem can handle the normal RTS-CTS behavoiur as well as handle that TxD data is received before the 23 ms delay has elapsed. If TxD data is received before the modem has activated the
CTS signal, the data is buffered. The time the data is delayed depends on how long after the activation of the RTS the first data bit is received. If a delay of 60 ms is chosen , all data received from the DTE interface (TxD) before the modem has activated the CTS signal is ignored.
S2 DIP-switch
Termination of the line
ON
1 2 3 4 5 6 7 8
No termination
ON
1 2 3 4 5 6 7 8
Termination
The line should be terminated at the end-points.
S2:6 Not used.
S2 DIP-switch
Activity timer
ON
1 2 3 4 5 6 7 8
Off
ON
1 2 3 4 5 6 7 8
On 1 min
The use of the timer is a fail safe to ensure that a faulty unit connected to the modem will not block the line.
S2:6 Not used.
S2 DIP-switch
Filtering of DCD and RXD
ON
1 2 3 4 5 6 7 8
Off
ON
1 2 3 4 5 6 7 8
On
If this is enabled, RxD is delayed (buffered) 6 ms in order to avoid garbage characters when carrier is deactivated.
The turn around time for the modem from sending to receiving on the line is 10 ms if this filter is enabled.
18 6600-2204
S3 DIP-switch
RS-422/485 termination
ON
1 2 3 4
No termination or failsafe
ON
1 2 3 4
2-wire termination with failsafe; T+/R+ and T– /R–
ON
1 2 3 4
4-wire termination with failsafe;
R+ and R–
Factory settings
ON
1 2 3 4 5 6 7 8
S1
ON
1 2 3 4 5 6 7 8
S2
ON
1 2 3 4
S3
6600-2204 19
RS-422/485 general advice
R+
R–
T+
T–
TD-23
4-wire termination
R– R+ T– T+ R– R+ T– T+ B’ A’ B A
=Termination
Slave unit Slave unit
2-wire termination
Slave unit
T+
T–
TD-23
TT+ TT+
Max 0.3 metre
B A
=Termination
Slave unit Slave unit Slave unit
Termination recommendations
The RS-422/485 line must be terminated. In the TD-23 the termination is combined with fail-safe functionality. For that reason it is important that the termination is used not to get undefined states when the bus is in three state condition.
… At 2-wire RS-485 both ends shall be terminated at the other most units of the bus.
… At 4-wire RS-485 both pairs shall be terminated at both ends.
… At 4-wire RS-422 it is only necessary to terminate the receivers.
RS-422/485 connection pins can be differently named. For some brands the T+ corresponds to A, but other brands might use some other naming convention.
If a unit does not work it can help to swap A and B.
20 6600-2204
Mounting
This unit should be mounted on 35 mm DIN-rail, which is horizontally mounted inside an apparatus cabinet, or similar.
Snap on mounting, see figure.
10 mm *
(0.4 inches)
Cooling
This unit uses convection cooling. To avoid obstructing the airflow around the unit, use the following spacing rules. Minimum spacing 25 mm
(1.0 inch) above /below and 10 mm (0.4 inches) left /right the unit. Spacing is recommended for the use of unit in full operating temperature range and service life.
* Spacing (left/right) recommended for full operating temperature range
25 mm
25 mm
Removal
Press down the black support at the back of the unit using a screwdriver, see figure.
CLICK!
6600-2204 21
Application examples
RS-232, 2-wire connection
2-wire twisted pair
DIP-switch setting for both units
S1
ON
1 2 3 4 5 6 7 8
S2
ON
1 2 3 4 5 6 7 8
S3
ON
1 2 3 4
22 6600-2204
Multidrop application
Master
S1
ON
1 2 3 4 5 6 7 8
ON
S2
1 2 3 4 5 6 7 8
ON
S3
1 2 3 4
ON
S1
S2
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6
ON
S1
S2
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
S3
1 2 3 4
S1
ON
1 2 3 4 5 6 7 8
ON
S2
1 2 3 4 5 6 7 8
ON
S3
1 2 3 4
RS-232
RS-485
RS-422
S1
ON
1 2 3 4 5 6 7 8
ON
S2
1 2 3 4 5 6 7 8
ON
S3
1 2 3 4
RS-232
S1
ON
1 2 3 4 5 6 7 8
ON
S2
1 2 3 4 5 6 7 8
ON
S3
1 2 3 4
RS-232
ON
S1
S2
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
S3
1 2 3 4
6600-2204 23
Westermo • SE-640 40 Stora Sundby, Sweden
Tel +46 16 42 80 00 Fax +46 16 42 80 01
E-mail: [email protected] www.westermo.com
REV.H 6600-2204 2019-01 Westermo Network Technologies AB, Sweden
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