Westermo TD-23 User manual

TD-23
Leased Line V.23 Modem
Multidrop applications
www.westermo.com

26600-2204

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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 www.westermo.com

46600-2204
Safety and Regulations
Warning signs are provided to prevent personal injury and/or damages to the product.
The following levels are used:
Level of warning Description Consequence
personal injury
Consequence
material damage
WARNING
Indicates a potentially
hazardous situation
Possible death or
major injury
Major damage to the
product
CAUTION
Indicates a potentially
hazardous situation
Minor or moderate
injury
Moderate damage to
the product
NOTICE
Provides information
in order to avoid
misuse of the
product, confusion or
misunderstanding
No personal injury Minor damage to the
product
NOTE
Used for highlighting
general, but important
information
No personal injury Minor damage to the
product

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Before installation:
Read this manual completely and gather all information on the product. Make sure that
you understand it fully. Check that your application does not exceed the safe operating
specifications for this product.
WARNING - SAFETY DURING INSTALLATION
The product must be installed by qualified service personnel
and built in to an apparatus cabinet or similar, where access is
restricted to service personnel only.
Upon removal of the product, ensure that the protective earthing
conductor is disconnected last.
WARNING - HAZARDOUS VOLTAGE
Do not open an energized product. Hazardous voltage may occur
when connected to a power supply.
WARNING - PROTECTIVE FUSE
The power supply wiring must be sufficiently fused.
It must be possible to disconnect manually from the power supply.
Ensure compliance to national installation regulations.
This product has no internal fuse and should be connected via an
external fuse for protection.
CAUTION - ELECTROSTATIC DISCHARGE (ESD)
Prevent electrostatic discharge damages to internal electronic
parts by discharging your body to a grounding point (e.g. use a
wrist strap).

66600-2204
Care recommendations
Follow the care recommendations below to maintain full operation of product and to
fulfill the warranty obligations:
• Do not drop, knock or shake the product. Rough handling above the specification
may cause damage to internal circuit boards.
• Use a dry or slightly water-damp cloth to clean the product. Do not use harsh
chemicals, cleaning solvents or strong detergents.
• Do not paint the product. Paint can clog the product and prevent proper operation.
If the product is used in a manner not according to specification, the protection provided
by the equipment may be impaired.
If the product is not working properly, contact the place of purchase, nearest Westermo
distributor office or Westermo technical support.
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.

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Agency approvals and standards compliance
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.
Type Approval / Compliance
EMC 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
Declaration of Conformity
Hereby, Westermo declares that this product is in compliance with applicable EU
directives and UK legislations. The full declaration of conformity and other detailed
information is available at www.westermo.com/support/product-support.

86600-2204
Electromagnetic Compatibility
Phenomena Test Description Test levels
ESD EN 61000-4-2 Enclosure contact ± 6 kV
Enclosure air ± 8 kV
RF field AM
modulated
IEC 61000-4-3 Enclosure 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
RF field 900 MHz ENV 50204 Enclosure 20 V/m pulse modulated 200 Hz, 900 ± 5 MHz
Fast transient EN 61000-4-4 Signal ports ± 2 kV
Power ports ± 2 kV
Surge EN 61000-4-5 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 ± 2 kV line to earth, ± 2 kV line to line
RF conducted EN 61000-4-6 Signal ports 10 V 80% AM (1 kHz), 0.15 – 80 MHz
Power ports 10 V 80% AM (1 kHz), 0.15 – 80 MHz
Power frequency
magnetic field
EN 61000-4-8 Enclosure 100 A/m, 50 Hz, 16.7 Hz & 0 Hz
Pulse magnetic field EN 61000-4-9 Enclosure 300 A/m, 6.4 / 16 µs pulse
Voltage dips
and interruption
EN 61000-4-11 AC power ports 10, 20, 5000 ms interruption
10 & 500 ms, 30% reduction
200 ms, 60% reduction
Mains freq. 50 Hz EN 61000-4-16 Signal ports 100 V 50 Hz line to earth
Mains freq. 50 Hz SS 436 15 03 Signal ports 250 V 50 Hz line to line
Voltage dips
and interruption
EN 61000-4-29 DC power ports 10 & 100 ms, interruption
500 ms, 30% reduction
10 ms, 60% reduction
+20% above & –20% below rated voltage
Radiated emission CISPR 16-2-3
ANSI C63.4
(FCC part 15)
Enclosure Class B
Class B
Conducted emission CISPR 16-2-1
ANSI C63.4
(FCC part 15b)
AC power ports Class B
AC power ports Class B
DC power ports Class B
Dielectric strength EN 60950 Signal port to other
isolated ports
2 kVrms 50 Hz 1 min
Power port to other
isolated ports
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
Operating –25 to +70°C
Storage & Transport –30 to +70°C
Humidity EN 60068-2-30 Operating 5 to 95% relative humidity
Storage & Transport 5 to 95% relative humidity
Altitude Operating 2 000 m / 70 kPa
Service life Operating 10 year
Vibration IEC 60068-2-6 Operating 7.5 mm, 5 – 8 Hz
2 g, 8 – 500 Hz
Shock IEC 60068-2-27 Operating 15 g, 11 ms
Packaging
Enclosure UL 94 PC / ABS Flammability class V-1
Dimension W x H x D 55 x 100 x 132 mm
Weight 0.25 kg
Degree of protection IEC 529 Enclosure IP 20
Cooling Convection
Mounting Horizontal on 35 mm DIN-rail
Type tests and environmental conditions

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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

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Functional description
Modem
chip
control
Analog filter
Frequency
modulation
Selectable
output level
Selectable
input sensitivity
Line relay
Data
buffer
DSR
GND
VCC
GND
2 or
4-wire
GND
RTS CTS DCD RD TD TD RD
Relay
output
DIP-switches
RS-232 RS-422/485
Data
buffer
Frequency
demodulation
Modem
Processor
Modulated data
OR
Block diagram

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Interface specifications
Power
Rated voltage 12 to 48VDC 12 to 27 VAC
Operating voltage 10 to 60VDC 10 to 30 VAC
Rated current 125 mA @ 12VDC
50 mA @ 24VDC
28 mA @ 48VDC
125 mA @ 12VAC
50 mA @ 24VAC
25 mA @ 32VAC
Rated frequency DC /AC 48 – 62 Hz
Inrush current I²t 0.09 A²s
Startup current* 0.35 A peak
Polarity Polarity independent
Isolation to RS-232 / RS-422/485 / Leased Line
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm² (AWG 24-12)
Shielded cable Not required

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RS-422/485
Electrical specification EIA RS-485
2-wire or 4-wire twisted pair
Data rate 300 bit/s – 1200 bit/s
Data format 7 or 8 data bits, Odd, even or none parity, 1 or 2 stop bits;
Σ9-12 bits
Protocol Transparent
Retiming No
Turn around time 4.2 ms (half duplex)
Transmission range ≤ 1200 m, depending on data rate and cable type (EIA RS-485)
Settings 120 Ωtermination and failsafe biasing 680 Ω
Protection Installation Fault Tolerant (up to ±60 V)
Isolation to Power / Leased Line
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
Shielded cable Not required*
RS-232
lectrical specification EIA RS-232
Data rate 300 bit/s – 1200 bit/s
Data format 7 or 8 data bits, Odd, even or none parity, 1 or 2 stop bits;
Σ9-12 bits
Protocol Transparent
Retiming No
Transmission range 15 m
Isolation to Power / Leased Line
Connection 9-pin D-sub female (DCE)
or Detachable screw terminal (DCE)
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
Shielded cable Not required*
Conductive housing 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.

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Relay (optional)
Rated voltage Up to 48 VDC
Operating voltage Up to 60 VDC
Contact rating 50 mA @ 48 VDC
Contact resistance 8 Ω
Transmission range ≤ 3 m, depending on data rate and cable type
Function The output follows the transmit carrier, I.e. output shorted
when carrier is ON.
Isolation to Power, Leased Line, RS-232, RS-485/422
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
Shielded cable Not required
Leased Line
Electrical specification 2- or 4-wire Leased Line
Data rate 300 bit/s – 1200 bit/s
Transmission level +3, –3, –6, –9, –10, –12, –13, –15 dBm
Transmision levels above –9 dBm are not allowed on
PTT networks only on private wires
Sensitivity reseption –45, –33, –27, –23 dBm
Protocol V23hdx, V23fdx
Turn around time 33 ms (half duplex)
Transmission range / Budget 30dB
Protection Installation Fault Tolerant (up to ±60 V)
Isolation to Power / RS-232 / RS-422/485
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
Shielded cable Not required

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Leased Line
Pos. Direction* Description Product
marking
No. 1 Out 4-wire Transmit
TX
In/Out 2-/4-wire
Receive/ Transmit
No. 2 Out 4-wire Transmit
In/Out 2-/4-wire
Receive/ Transmit
No. 3 In 4-wire Receive RX
No. 4 In 4-wire Receive
Location of interface ports, LEDs and DIP-switches
* Direction relative this unit. NC = Not Connected
RS-422/485
9-pos. Direction* Description Product
marking
No 9 In R+ (A’) Receive
RS-422/485 4-wire R+
No 8 In R– (B’) Receive
RS-422/485 4-wire R–
No 7
Out T+ (A) Transmit
RS-422/485 4-wire T+
In/Out T+/R+ (A/A’) Transmit/Receive
RS-422/485 2-wire
No 6
Out T– (B) Transmit
RS-422/485 4-wire T–
In/Out T–/R– (B/B’) Transmit/Receive
RS-422/485 2-wire
Relay (optional)
Position Direction* Description
No.1 Out Normal open
No.2 Out Common
RS-232 (DTE)
Position
D-sub Screw
terminal Direction* Description D-sub description
No.1 Out Data Carrier Detect (DCD)
1
2
3
4
5
6
7
8
9
No.2 No. 4 Out Received Data (RD)
No.3 No. 3 In Transmitted Data (TD)
No.4 NC Data Terminal Ready (DTR)
No.5 No. 5 –Signal Ground (SG)
No.6 Out Data Set Ready (DSR)
No.7 In Request To Send (RTS)
No.8 Out Clear To Send (CTS)
No.9 NC Ring Indicator (RI)
RS-232 (DTE)
For details, se below
Power connection LV
For details, se below
Leased Line
For details,
se below
Power connection
Pos. Direction* Description Product
marking
No. 1 In AC: Neutral
DC: –Voltage
No. 2 In AC: Line
DC: +Voltage

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LED Indicators
LED Status Description
DCD
CTS
RTS
TD
RD
PWR
PWR
Power ON In service
OFF Out of service
RD
Receive data ON Data transmitted on the RS-232 or RS-485 port
OFF No data transmitted on the RS-232 or RS-485 port
TD
Transmit data ON Data received on the RS-232 or RS-485 port
OFF No data received on the RS-232 or RS-485 port
RTS
Request
to send
ON RTS signal active on the RS-232 port
OFF RTS signal inactive on the RS-232 port
CTS
Clear to send ON CTS signal active on the RS-232 port
OFF CTS signal inactive on the RS-232 port
DCD
Data carrier
detect
ON DCD signal active on the RS-232 port
OFF DCD signal inactive on the RS-232 port

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NOTE - DIP-SWITCH ALTERATIONS
DIP-switch alterations are only effective after a power on.
S1 DIP-switch
Selection of transmission level
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
–9 dBm
ON
1 2 3 4 5 6 7 8
–13 dBm
ON
1 2 3 4 5 6 7 8
–15 dBm
DIP-switch settings
Before DIP-switch settings:
ON
1 2 3 4 5 6 7 8
3 dBm
ON
1 2 3 4 5 6 7 8
–3 dBm
ON
1 2 3 4 5 6 7 8
–6 dBm
S1 S2 S3
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!
CAUTION - ELECTROSTATIC DISCHARGE (ESD)
Prevent electrostatic discharge damages to internal electronic
parts by discharging your body to a grounding point (e.g. use a
wrist strap).

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S1 DIP-switch
Carrier active using RTS or incoming data
ON
1 2 3 4 5 6 7 8
Incoming data
ON
1 2 3 4 5 6 7 8
Permanent carrier
ON
1 2 3 4 5 6 7 8
RTS
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
–33 dBm
ON
1 2 3 4 5 6 7 8
–27 dBm
ON
1 2 3 4 5 6 7 8
–23 dBm
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
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.
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.

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S2 DIP-switch
Selection of 2/4 wire RS-422/485 side
ON
1 2 3 4 5 6 7 8
4-wire
ON
1 2 3 4 5 6 7 8
Deactivate
RS-422/485
ON
1 2 3 4 5 6 7 8
2-wire
S2 DIP-switch
RTS-CTS delay, 23 or 60 ms
ON
1 2 3 4 5 6 7 8
23 ms
ON
1 2 3 4 5 6 7 8
60 ms
S2 DIP-switch
Termination of the line
ON
1 2 3 4 5 6 7 8
Termination
ON
1 2 3 4 5 6 7 8
No
termination
S2 DIP-switch
Activity timer
ON
1 2 3 4 5 6 7 8
On 1 min
ON
1 2 3 4 5 6 7 8
Off
S2 DIP-switch
Filtering of DCD and RXD
ON
1 2 3 4 5 6 7 8
On
ON
1 2 3 4 5 6 7 8
Off
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.
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.
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.
The line should be terminated at the end-points.
S2:6 Not used.
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.

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S3 DIP-switch
RS-422/485 termination
2-wire termination with
failsafe; T+/R+ and T– /R–
4-wire termination with failsafe;
R+ and R–
No termination
or failsafe
Factory settings
ON
1 2 3 4 5 6 7 8
S2
ON
1 2 3 4 5 6 7 8
S1
ON
1 2 3 4
S3
ON
1 2 3 4
ON
1 2 3 4
ON
1 2 3 4

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=Termination
T
D-23
Slave unit Slave unit Slave unit
T
D-23
Slave unit Slave unit Slave unit
Max 0.3 metre
=Termination
T+
T–
T+T- T+T- AB
R+
R–
T+
T–
R– R+ R+T– T– B’ A’ BAT+T+ R–
2-wire termination
4-wire termination
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.
RS-422/485 general advice