indicates that the master received a response, but it was shorter than what the protocol expected for that specific request
Do not assume the software is wrong. Assume the communication channel is imperfect. Work backwards from the raw hex dump, through the timing settings, to the RS-485 voltage levels. In 90% of cases, the fix is one of three things: matching baud rates, adjusting the response timeout, or adding a termination resistor.
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indicates that the master received a response, but it was shorter than what the protocol expected for that specific request
Do not assume the software is wrong. Assume the communication channel is imperfect. Work backwards from the raw hex dump, through the timing settings, to the RS-485 voltage levels. In 90% of cases, the fix is one of three things: matching baud rates, adjusting the response timeout, or adding a termination resistor. modbus poll bytes missing error