HNC Electric HRS Series, Operation Manual

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Slave-station
address
Function code
Starting address
High byte
starting address
Low byte
Number of
registers
High volume
Number of
registers
Low volume
CRC Check
0x01 0x04 0x01 0x80 0x00 0x07
04 function code register address is wrong, so the slave station responds:
Slave-station address Function code Abnormal code CRC check
0x01 0x84 0x02
7.3.3 Illegal data value 03
Inquiry message format of master station:
Slave-station
address
Function code
Starting address
High byte
starting address
Low byte
Number of
registers
High volume
Number of
registers
Low volume
CRC Check
0x01 0x04 0x01 0x80 0x01 0x80
04 function code register address is wrong, so the slave station responds:
Function code Abnormal code CRC check
0x84 0x03
7.4 Precautions for use
(1) The communication address, communication speed, and inspection mode of the soft starter must be the same as the
communication settings of the controller.
(2) If the response data cannot be received, check the above parameter settings, whether the connection to the 485
terminal is correct, and whether the CRC validation is correct.
(3) When communicating with multiple HRS units, a 120 ohm resistor should be connected to both ends of AB on the last
unit.
(4) When connecting with other Modbus devices, it should be connected as follows: