[ts-7000] TS-7200 talking to Siemens S7-200

["sergio_dellasantina" <>]

I managed setting up an half duplex RS-485 (/dev/ttyAM1) data transfer
between an TS-7200 and a PLC Siemens S7-200, via modbus protocol.

The modbus messages sent by the TS-7200 are correctly received by the
S7, but the answers sent back from the S7 to the TS-7200 device have
the most significant bit of their bytes set to zero, regardless of
their real value.

For example, if the S7 sends me the byte 0xA5, I get the value 0x25,
and this happens for each byte sent.

I am sure that the S7 works correctly, maybe a wrong RS-485 setting of
the TS-7200?

Thank you very much

Sergio



 
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