Technical data

Accessing Remote Plants (Remote Maintenance)
TeleService V6.1 Service Software for SIMATIC S7 and C7
A5E00921336-01
7-5
7.6 Checklist for Troubleshooting the Modem
The following list should help if you experience problems with the modem by
identifying potential causes. The settings that need to made and the dialog boxes
where they are made are described in the help topics below.
Cannot make a modem connection:
Check the cable and the connectors.
Have you set the correct dialing mode (tone/pulse)?
If your modem no longer responds after a few unsuccessful dialing attempts, a
dialing blocker may be activated. Inform yourself about how dial blocking is
implemented in your modem.
Are you operating your modem on a main phone line or on an extension line?
Configure the properties and dialing parameters of the modem accordingly.
Enable the log file option in the advanced properties. The next attempt to
establish a connection will then be recorded in a file in the Windows directory.
Ensure that the employed ISDN-TAs are working with the same B and D
channel protocols.
The modem connection breaks:
Metering pulses can have a negative affect on a connection. Have the pulse
deactivated by your phone company.
Set fixed monitoring times.
Deactivate the option that disconnects an existing connection automatically
after a specified time without data transfer (idle).
Ensure that you have activated the RTS/CTS protocol for data flow control.