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

>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.

Typically, this is because you have the serial port set up to strip
parity bits from the received bytes.  The man page for termios has all
the details you need.  You probably want to turn off ISTRIP in c_iflag,
and make sure you are using CS8 in c_flag.

( I usually memset the termios struct to 0, then explicitly set only
the bits that I want. )

Mark S.


 
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