Westermo TD-29 AC Manuel D'installation page 8

Modem description
The TD-29 is designed for communication on 2-wire copper cable (twisted pair).
Multidrop or point to point is possible. The TD-29 will support half duplex at baud rates
up to 19 200 bit/s.
The TD-29 is easy to configure for different operating conditions with DIP-switches.
Character formats, baud rate, transmission level, DCD detection level and communica-
tion interface are possible to select. DTE-equipment can be connected through an
RS-232 or an RS-485/422 interface. The RS-232 connection can be made through either
the DB-9 connector or screw terminal on the front of the unit. There are four-baud
rate settings.
When using the RS-232 interface the direction of communication can be controlled by
RTS handshake signal or incoming data.
When connecting in multidrop configurations the maximum number of units that can be
connected on the bus and the maximum bus length depends on the line quality. At 9 600
bit/s a typical value is 10 units 10 km apart*.
The TD-29 is designed to be used on dedicated lines and is not approved
to European standard CTR-15 (2-wire leased line).
* The bus length and number of units are calculated with 123 Ohm and 42 nF / km cable.
8 6611-2001
AUDIN - 8, avenue de la malle - 51370 Saint Brice Courcelles
Tel : 03.26.04.20.21 - Fax : 03.26.04.28.20 - Web : http: www.audin.fr - Email : info@audin.fr