remainder bit of last data byte (until to the high bit of the byte). The byte count
field specifies all byte num. of the data.
Request Packet
(Master→SPM33)
Response Packet
（SPM33→Master）
Unit ID/ Slave
address
1 byte Unit ID/ Slave
address
1 byte
01H (Function
Code)
1 byte 01H (Function
Code)
1 byte
Starting address 2 bytes Byte num. (N) 1 byte
Relay num. 2 bytes Relay status N bytes
CRC check code 2 bytes CRC check code 2 bytes
N = output num.÷ 8, if remainder ≠0, then N=N+1.
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