Modbus Serial - Connecting PLC Via RS232
I am trying to connect Telemecanique PLC to the Mango M2M system.
I have connected the PLC using RS232 Cable and able to see the /dev/ttyS* devices from Mango M2M, however when I am trying to scan for Modbus Hardware, I can not see any results. I have read the post about the same problem which "mlohbihler" advice to check that the PLC able to answer to ReadExceptionStatus request (in other word to check that the PLC monitor mode is activated) and verified it as well.
is there any additional information i need to know about Telemecanique PLC hardware, is anybody succeed with connecting Mango M2M to PLC using 'Modbus Serial' Module and RS232 Cable?
any answer will be appreciate,
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