Article 2.0.1V : Modbus - Sample query format

Article 2.0.1V : Modbus - Sample query format

01 : Device ID
03 : Modbus read function 
00 64 : Starting Address
00 02 : No. of registers
85 D4 : CRC

RESPONSE MESSAGE received will be 01 03 04 DD DD DD DD CRC, Here DD DD DD DD is the 4 bytes of data.


For example to read Amps total, Amps R, Amps Y and Amps B (4 Parameters) form the device with ID 1, the QUERY MESSAGE sent is : 01 03 00 94 00 08 05 E0

Here,     

01 : Device ID
03 : Modbus read function
00 94 : Starting Address
00 08 : No. of registers
05 E0 : CRC


RESPONSE MESSAGE received will be 01 03 10 DD DD ....... DD DD  CRC, Here DD DD ....... DD DD is the 16 bytes of data.