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current master requests to read one word, set read byte number transmitted from
the slave to 02H.
Note: The count unit of the length of the read data is different from that of request
message.
4) Read data: Data corresponding to the communication address in the request
message.
Note: Read data firstly sends high byte then low byte in an opposite direction to
CRC code.
3. Slave error response message
Table A.5 Slave error response message of Command code 03H
Slave address
Command
code
Error code CRC code
2 bytes
1 byte 1 byte 1 byte
Low byte High byte
83H
1) Slave address and CRC code: See “A2.2”.
2) Command code: 83H. It is = 03H + 80H.
3) Error code. For detail see “A2.4 Error code”.
4) Example: Read upper limit frequency.
Master request message: 01 03 00 08 00 01 05 C8
Normal response message: 01 03 02 13 88 B5 12 (Suppose that current upper limit
frequency is 50 Hz)
Error response message: 01 83 03 01 31 (Suppose that read word number is altered
from 0001 to 0002)
A2.2.2 Write one word (2 bytes) — Command code 06H
1. Master request message
Table A.6 Format of master request message
Slave
address
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