General
Communication between PLCs using an external modem
Introduction One of the stations is a PLC connected to the telephone network via an external modem.
The other station is a PLC connected to the telephone network via the TSX MDM 10 card.
Description of the hardware configuration:
Calling station
PLC with a TSX
SCP 111 card
Switched telephone network
External modem from COM1
Called station
PLC with a TSX
MDM 10 card
TSX MDM 10 card end
TSX SCP 111 card end
The TSX MDM 10 card is configured with the default values from the configuration screen in Uni-telway mode.
The TSX SCP 111 is configured with the default values from the configuration screen in Uni-telway master mode, where the number of slaves is equal to 2 and the wait timeout must be set to the default value (2 s).
l l l
The external modem from COM1 is configured with the following AT commands: l AT&F&K%C0 where: l &F: sends the default configuration, l &K: flow control deactivated, l %C0: data compression deactivated
ATS0=2 : sets 2 rings before automatic reply
AT&D0
AT&D2
: if the DTR signal has not been set to 1 in the TSX SCP 111 card
: if the DTR signal has been set to 1 in the TSX SCP 111 card
TLX DS COM PL7 xxE
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