Pilot Communications SPM33 - Read Holding Registers (Function Code 03 H)

8.3.2. Read Holding Registers (Function Code 03H)
This command packet requests that the SPM33 responds all valid registers.
The value of reserved registers is 0.
Request Packet
(Master→SPM33)
Response Packet
(SPM33→Master)
Unit ID/ Slave
address
1 byte Unit ID/ Slave address 1 byte
03 H (Function
Code)
1 byte 03 H (Function Code) 1 byte
Start register
address
2 bytes Byte num.
(2 * register num.)
1 byte
Registers num. 2 bytes First register data 2 bytes
CRC check code 2 bytes Second register data 2 bytes
... ...
CRC check code 2 bytes
35