Westermo TD-32 - Manual (Page 4)

4 6178-2203
Introduction
The Westermo TD-32 is an industrialised dial and leased line modem. This modem has been devel-
oped 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 compression and error correc-
tion. 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 twist-
ed pair cables to provide long distance asynchronous communications.
A watchdog facility continually monitors the power supply and internal hardware as well as the oper-
ational 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 is available in two standard versions for power supply by 230V AC or 12–36VDC.
Special 115V AC and 36–60V 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 informa-
tion).
The TD-32 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 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-32DC shall only be installed to a power supply of the type SELV.