Protocol Error Return Code 01
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1. The request is successfully processed by the slave and a valid response is sent. 2. The request is not received by the slave therefore no response is sent. http://www.simplymodbus.ca/exceptions.htm 3. The request is received by the slave with a parity, CRC or LRC error. The slave ignores the request and sends no response. 4. The request is received without an error, but cannot be processed by the slave for another reason. The slave replies with an exception response. In a normal response, the slave echoes the function code. The first sign of an protocol error exception response is that the function code is shown in the echo with its highest bit set. All function codes have 0 for their most significant bit. Therefore, setting this bit to 1 is the signal that the slave cannot process the request. Function Code in Request Function Code in Exception Response 01 (01 hex) 0000 0001 129 (81 hex) 1000 0001 02 (02 hex) 0000 0010 130 protocol error return (82 hex) 1000 0010 03 (03 hex) 0000 0011 131 (83 hex) 1000 0011 04 (04 hex) 0000 0100 132 (84 hex) 1000 0100 05 (05 hex) 0000 0101 133 (85 hex) 1000 0101 06 (06 hex) 0000 0110 134 (86 hex) 1000 0110 15 (0F hex) 0000 1111 143 (8F hex) 1000 1111 16 (10 hex) 0001 0000 144 (90 hex) 1001 0000 Here is an example of a request with an Exception Response: Request This command is requesting the ON/OFF status of discrete coil #1186from the slave device with address 10. 0A 01 04A1 0001 AC63
0A: The Slave Address (0A hex = address10 ) 01: The Function Code 1 (read Coil Status) 04A1: The Data Address of the first coil to read ( 04A1 hex = 1185 , + 1 offset = coil #1186 ) 0001: The total number of coils requested. AC63: The CRC (cyclic redundancy check) for error checking. Response 0A 81 02 B053 0A: The Slave Address (0A hex = address10 ) 81: The Function Code 1 (read Coil Status - with the highest bit set) 02: The Exception Code B053: The CRC (cyclic redundancy check). Following the Function Code is the