Issues with serial communication between STEP7 200 and a computer

2015-06-06View Original

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I’m having trouble establishing a connection between the CPU 224XP and a PC using an RS232-RS485 converter and serial cables. I’ve tried different converters, serial cables, and computers; it’s possible to rule out faults with the computer’s serial port, the serial cables, or the converter. Additionally, both devices can communicate with each other using USB-PPI cables, so PLC interface issues can also be ruled out. Which expert has encountered this and how did they solve it?

Reply #22015-07-31

It might be that your communication address and frequency haven’t been set properly.

Reply #32015-07-31

You’re not using a Siemens serial cable, are you? If that’s the case, then it’s a problem with your serial cable. They all look like serial ports, but the wiring is different?

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Issues with serial communication between STEP7 200 and a computer

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