Accessories
C.2 Modems and routers
CP 1243-8 IRC
204 Operating Instructions, 02/2018, C79000-G8976-C385-03
The MD720 supports the following functions:
●
The MD720 is set to one of the following two modes depending on the type of
communication required:
– OPC mode
– Terminal mode
●
In OPC mode, there is productive data exchange with the control center using GPRS.
●
In terminal mode, the MD720 uses CSD communication for the following functions:
– Sending and receiving SMS messages
– Diagnostics and maintenance functions
– Transfer of configuration data
●
Communication with a control center
In OPC mode, an MD720 connected to an S7 station communicates with a control center
via a TCP connection. For the data transfer, the GSM network is used with the GPRS
service. Either the MSC protocol or the MSCsec protocol is used (see below).
●
Sending and receiving SMS messages
The locally connected application (SIMATIC) can transfer data for an SMS message to
the MD720 using AT commands. The MD720 sends the SMS message to a subscriber in
the GSM network (mobile wireless telephone) or when using a gateway, to a remote fax
machine.
SMS messages received by the MD720 can be queried by the local application using AT
commands.
●
Service data calls via remote connections in CSD format are used for the following
purposes:
– Remote configuration of the MD720
– Diagnostics and maintenance functions using AT commands
– Process data connections between stations with TIM module or CP 1243-8 IRC
The partner for the remote connection can be an analog modem, an ISDN modem or a
GSM modem.
●
Controlling the MD720 using AT commands
You can control the MD720 from a locally connected application or manually with a
terminal program connected locally.
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