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In servermode, the following settings are possible:
Transparent (RS-232 connected)
If a device is connected to the SVM via RS-232 and modem emulation is switched off, the servermode
connection structure is transparent.
The server application can take the initiative to establish a connection and is transparent as soon as the
local and external connections have been established. Therefore, no modem is emulated in this mode, but
the connection immediately becomes transparent.
In this mode, too, a configurable start string can be sent to the server application (SCADA) to inform it that
the PLC is ready. Status changes at the contact inputs can also be reported in this mode.
Modem emulation (RS-232 connected)
In servermode, the external server application can take the initiative to establish a connection. Depending
upon the auto-answer command ATS0, the connection will become transparent either automatically
or not until the application has sent the answer command ATA. For the server application (SCADA), the
connection (with the SVM) is ready immediately, whilst the local connection between SVM and PLCE does
not yet need to be transparent. A configurable start string can be sent to inform the server application
(SCADA) when the connection has been fully established (is transparent).
A CONNECT is thus sent to the serial port. The various RS-232 signals, such as DCD, DTR, RI, etc., are also
supported. Status changes at the contact inputs can also be reported in this mode.
In this mode, the IP address obtained can be requested with the ATI4 command. This is particularly handy
if the set IP address is unknown, but this information is needed by the installer on site.
3.5.3. Server/clientmode
If the server/clientmode is switched on, the SVM waits in idle mode until a connection is established from
outside. If, however, the status of the contact inputs changes, or if data is sent to the RS-232 port/Ethernet
port, the SVM switches to clientmode and takes the initiative for the connection.
3.6.
Advanced connection settings
3.6.1. Connection string upon initial connection
A string has to be set up for sending to the server application as soon as the connection is transparent.
This informs the server which device is connected and that it is possible to communicate. This string is
sent to the server application when a connection is established in the following situations:
• RS-232 connected, servermode;
• RS-232 connected, clientmode autologon.
3.6.2. Time-outs
Various time-outs have been implemented to prevent the modem from getting stuck in a particular state
due to unforeseen events. These ensure that the modem is reset and will then return to idle mode.
Data time-out
This time-out occurs if there is a connection to the server, but data is no longer coming in via the 4G
network.
• Time configurable between 1 and 10800 minutes (7 days).
• If the value 0 is entered, this time-out is not active.
Connect time-out
This time-out occurs if the connection with the server takes longer than the set period of time.
• Time configurable between 1 and 168 hours (7 days).
• If the value 0 is entered, this time-out is not active.
No activity time-out
This time-out occurs if there has been no connection with the server for a set period of time.
• Time configurable between 1 and 168 hours (7 days).
• If the value 0 is entered, this time-out is not active.
3.6.3. Terminate connection in the event of alarm
If an alarm occurs whilst the SVM is sending data, in this option it is possible to choose whether the data
connection can be terminated so that the alarm notification can be sent.
Manual SVM 4G modem | Back to
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