Technical Bulletin

Modbus RTU On-Board Communications
12 PowerXL DG1 Series VFD MN040010EN—May 2014 www.eaton.com
Example of the request to write single register 2000 from
Slave device 18, the output value is 5.
Table 16. Request to Write Single Register
Example of Write coils 19–28 from Slave device 18.
Table 17. Write Coils 19–28
Note: The binary bits correspond to the outputs in the
following way.
Table 18. Binary Bits and Corresponding Outputs
Example of write Holding registers 2000-2001 from Slave
device 18.
Table 19. Request to Write Holding Registers
Item Code Description
Slave address 0x12
Function code 0x06
Output address High 0x07 Starting address 0x07D0 hex (= 2000)
Output address Low 0xD0
Output value High 0x00 Output value 0x0005 hex (= 5)
Output value Low 0x05
CRC High 0x4B
CRC Low 0xE7
Item Code Description
Slave Address 0x12
Function code 0x0F
Starting Address High 0x00 Starting Address 0x0013 (=19)
Starting Address Low 0x13
Quantity of Outputs
High
0x00 Quantity of Outputs 0x000A (= 10)
Quantity of Outputs
Low
0x0A
Bye Count 0x02
Outputs Value High 0xCD
Outputs Value Low 0x01
CRC High 0xAB
CRC Low 0xFB
Bit 1100110100000001
Output 2625242322212019——————2827
Item Code Description
Slave Address 0x12
Function code 0x10
Starting Address High 0x07 Starting Address 0x07D0 (= 2000)
Starting Address Low 0xD0
Quantity of Outputs
High
0x00 Quantity of Outputs 0x0002 (= 2)
Quantity of Outputs
Low
0x02
Bye Count 0x04
Outputs Value High 0x00
Outputs Value Low 0x01
Outputs Value High 0x00
Outputs Value Low 0x02
CRC High 0x53
CRC Low 0x46