77
Modbus RTU control (RS-485 communication)
z
Query
Field name Data Description
Slave address 04h Slave address 4
Function code 10h Writing to multiple holding registers
Data
Register address value (upper) 07h
Register address to start writing from
Register address value (lower) 00h
Number of registers (upper) 00h
Number of registers to be written from the starting register address
(8 registers=0008h)
Number of registers (lower) 08h
Number of data bytes 10h
Value of twice the number of registers in the query
(8 registers × 2 = 16 registers: 10h)
Value write to register address (upper) 00h
Value written to register address 0700h
Value write to register address (lower) 00h
Value write to register address +1 (upper) 00h
Value written to register address 0701h
Value write to register address +1 (lower) C8h
Value write to register address +2 (upper) 00h
Value written to register address 0702h
Value write to register address +2 (lower) 00h
Value write to register address +3 (upper) 00h
Value written to register address 0703h
Value write to register address +3 (lower) 64h
Value write to register address +4 (upper) 00h
Value written to register address 0704h
Value write to register address +4 (lower) 00h
Value write to register address +5 (upper) 00h
Value written to register address 0705h
Value write to register address +5 (lower) 14h
Value write to register address +6 (upper) 00h
Value written to register address 0706h
Value write to register address +6 (lower) 00h
Value write to register address +7 (upper) 00h
Value written to register address 0707h
Value write to register address +7 (lower) 32h
Error check (lower) A5h
Calculation result of CRC-16
Error check (upper) 48h
z
Response
Field name Data Description
Slave address 04h Same as query
Function code 10h Same as query
Data
Register address value (upper) 07h
Same as query
Register address value (lower) 00h
Number of registers (upper) 00h
Same as query
Number of registers (lower) 08h
Error check (lower) C0h
Calculation result of CRC-16
Error check (upper) EEh
To Next Page
Loading...
