Special Hardware Requirements:
- One PC/PPI cable
- One appropriate interface (depends on the outputs of the modem: for example, a 9-pin male to 25-pin male)
- One null modem for swapping the transmit and receive lines (lines 2 and 3)
- One Hayes modem
The Hayes modem should have a transmission rate of 9600 baud. However, you can use a slower modem.
This example demonstrates how to use a standard Hayes-compatible modem to transmit a message string. The modem connected to the S7-200 dials up another modem by means of the Freeport communication mode.
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Program Flowchart:
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