BEWATOR COTAG 4101-2, Руководство по установке, Страница: 78 / 158

4101-2 Controller Installation Handbook
8-10
Using one or more dial-up modems to communicate with
Controllers at remote sites
Computer Computer
Modem Modem Modem
RS232 RS232 RS232
Controller Controller
u/s
RS232 d/s
RS485
Modem
Controller
4232 (type F)
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Normal dial-up
telephone line
connected when
required - modem at
remote site can be dialled
by the software in the host
computer - any of the
modems at the host site
can be dialled by the type F
Comms module at the
remote site
In this layout, the host computer, and any other computer on a local
area network, is connected to one or more modems. Each modem is
connected to a normal dial-up telephone line.
At the remote site, the modem is connected to a normal dial-up
telephone line and to the upstream connections of a 4232 Comms
module whose address switch is set to F. The upstream DIR/DIAL
jumper JU2 on the Comms module at the remote site must be set to
DIAL. This enables the Comms module to dial out to the host
computer via the modem.
The Comms module can communicate downstream with Controllers,
and more Comms modules to give any size system.
The system is configured from software running on the host
computer. This specifies when the host computer dials out to the
remote site, and when the Comms module dials in to the host.