sepam 20 user manual - Schneider Electric

PE80120
Use SFT2841 setting and operating
software
Configuration of a Sepam network
Configuration window for the communication network via
telephone modem.
PCRED301005EN - 06/2008
Link via telephone modem
The Sepams are connected to an RS 485 multidrop network using an industrial STN
modem.
This modem is the "called modem". It must first be configured, either via AT
commands from a PC using HyperTerminal or the configuration tool that may have
been supplied with the modem, or by setting switches
(see the modem manufacturer’s manual).
The PC can use an internal or an external modem. This modem on the PC side is
always the calling modem. It must be installed and configured in accordance with the
Windows modem installation procedure.
Configuration of the calling modem in SFT2841
When configuring a Sepam network, SFT2841 displays the list of all the modems
installed on the PC.
The communication parameters to be defined are:
b modem: select one of the modems listed by SFT2841
b telephone no.: no. of the remote modem to be called
b speed: 4800, 9600, 19200 or 38400 bauds
b parity: none (not adjustable)
b handshake: none, RTS or RTS-CTS
b time-out: from 100 to 3000 ms.
Communication via modem and telephone network is slowed considerably because
of the transit time through the modems. A time-out of between 800 ms and 1000 ms
is sufficient in most 38400 baud installations. In some cases, the poor quality of the
telephone network may require a slower speed (9600 or 4800 bauds). The time-out
value should then be increased (2 to 3 seconds).
b number of retries: from 1 to 3.
Note: The speed and parity of the calling modem must be configured in Windows with the same
values as for SFT2841.
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