Pilot Communications SPM33 User Manual

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
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Pilot Communications SPM33 Specifications

General

Brand	Pilot Communications
Model	SPM33
Category	Measuring Instruments
Language	English