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6-33

Cabling and Wiring the System

SIMATIC 545/555/575 System Manual

Use these procedures to establish communication between modems in a

dedicated line configuration.

1. Connect the modem configuration.

2. Ensure that the CPU and modem baud rates are set to the same value.

NOTE: If the modems are auto-bauding, ensure that the CPU baud rate is

set within the baud rate range of the modems.

3. Power up the modems and verify that they are connected, usually by

consulting an indicator on the modems.

4. Start TISOFT; TISOFT auto-bauds to the system’s baud rate (CPU and

modem).

Use these procedures to establish communication between modems in a

dial-up phone line configuration.

1. Connect the modem configuration.

2. Ensure that the CPU and modem baud rates are set to the same value.

3. Depending on the type of modems being used, the following are three

ways to establish communication between the modems.

• Manually call from one modem station to the other modem station

and then switch on both modems.

• Manually call from one modem station to an auto-answer modem

at the other station.

• Use TIDIAL dialing software installed with TISOFT Release 5.0 to

call an auto-answer modem at the CPU modem station.

4. Start TISOFT; TISOFT auto-bauds to the system (CPU and modems)

baud rate.

Dedicated Line

Operation

Dial-up Phone Line

Operation

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