NORD Drivesystems BU0050 - Manual (Page 67)

2.5 Modbus RTU: Function codes
BU 0050 GB-3111 Subject to technical amendments 67
Example 1:
Parameter P613 [0] is written with the value 0x00123456.
Query (Master

Slave) Response (Slave

Master)
Address 0x08 Address 0x08
Function Code 0x10 Function Code 0x10
Start address High 0x99 Start address High 0x99
Start address Low 0x40 Start address Low 0x40
Number of parameters High 0x00 Number of parameters High 0x00
Number of parameters Low 0x02 Number of parameters Low 0x02
Number of bytes 0x04 CRC High 0x6E
Parameter value 1 High 0x00 CRC Low 0x19
Parameter value 1 Low 0x12
Parameter value 2 High 0x34
Parameter value 2 Low 0x56
CRC High 0x29
CRC Low 0xAE
Example 2:
Parameters P050[1] to P050[3], i.e. setpoint values 1 to 3 are written.
Control word1 = 1000 // SW2 = 2000 // SW3 = 3000.
Query (Master

Slave) Response (Slave

Master)
Address 0x08 Address 0x08
Function Code 0x10 Function Code 0x10
Start address High 0x0C Start address High 0x0C
Start address Low 0x81 Start address Low 0x81
Number of parameters High 0x00 Number of parameters High 0x00
Number of parameters Low 0x03 Number of parameters Low 0x03
Number of bytes 0x06 CRC High 0xD3
Parameter value 1 High 0x03 CRC Low 0xE9
Parameter value 1 Low 0xE8
Parameter value 2 High 0x07
Parameter value 2 Low 0xD0
Parameter value 3 High 0x0B
Parameter value 3 Low 0xB8
CRC High 0xF5
CRC Low 0xDF