Westermo TD-32 B - Manuel (Page 2)

3 6178-2010
Introduction
The Westermo TD-32 B is an industrialised dial and leased line modem.This modem has been
developed to be used in industrial applications and has some features you would not expect to find
on a normal modem.Terminal data rates of up to 57.6 kbit/sec can be handled using data compress-
sion and error correction.The maximum line modulation speed is 14 400 bit/sec (V.32bis). Leased
line connections can be made on 2 or 4 wires.The modem can also be used on ordinary twisted
pair cables to provide long distance asynchronous communications. A watchdog facility continually
monitors the power supply and internal hardware as well as the operational software. In the event
of a problem the modem automatically resets.This feature has been included to make the unit more
suitable for use in unmanned locations.The TD-32 B is available in two standard versions for power
supply by 230 V AC or 12–36 V DC. Special 115 V AC and 36–60 V DC models are also available on
request.Westermo have implemented commands often left out of standard modems.Two examples
of these Westermo specific AT-commands are &D and &A (see AT-command description for further
information).The TD-32 B can handle 11 data bits and has a special 2 stop bit mode to allow the
unit to be used in applications many modems can’t handle.The TD-32 B has been designed with the
engineer in mind, hence the extensive information on the command set, S registers, DIP switched
and error codes.We have endeavoured to include all necessary information however if you need
more please do not hesitate to call us.
Safety
This equipment should only be installed by professional service personnel. If the unit is intended
for permanent connection to mains supply, there should be a readily accessible disconnect device
(circuit breaker) incorporated into the fixed wiring. Line connections on this equipment are designed
for connection to TNV circuits.The mains connection is classified as excessive voltage. Description
of the above classifications are given in EN60950:1992.
The TD-32 B DC shall only be installed to a power supply of the type SELV.
Installation
The modem should be connected in the following way:
Power connection is made through screwblock at bottom right corner
➅. For 115 V AC or 230 V AC
it is a 3-pole connector, and for 12–36 or 36–60 V DC a 2-pole connector. Computers or other
equipment are connected through an RS-232/V.24 connection.This connection can be made either
to the 25-pole D-sub
➄ or the 9-pole screw connector ➃. Do not use ribbon cable for RS-232
connections.The LED:s
➀ show the status of the serial DTE-side and general modem status.
Line connection
The telephone line is connected to the 6-pole RJ-12 connector ➁ or to the 4-pole screw block ➂ in
the bottom left side.When using the screw-block a strap plug supplied must be placed in the RJ-12
connector
➁. If this is not done the outgoing signal will not be connected to the screw-block ➂.
2-wire lines are connected to the two middle pins (3 & 4) in the RJ-12 plug ➁ or the TX screws ➂
(1 & 2).
4-wire lines are connected to the screw terminal
➂, transmitter to TX (1 & 2) and receiver to RX
(3 & 4).The pin numbers of the line connectors are described in picture.
DIP-switches
Disconnect power before changing DIP-switches!
Use ESD-protection when changing switches.The DIP-Switches are underneath the top lid of the
modem. Please refer to picture for placement of DIP-switches. Non defined switches will be in off
position. X-marked switches is “don’t care” for the described function.
Handshaking
The TD-32 B is delivered with a factory setting for “hardware handshake” with RTS-CTS which
means that if only TX, RX and GND are connected no data will be sent on the receiving modem’s
RS-232 connection unless RTS is high.The problem can be solved by placing a jumper between RTS
(screw terminal no 6) and for example DSR (screw terminal no 2) or by disabling the handshake
with the command AT&K0, or with switch 3:2 (switch settings).
A
B
C
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