dooch Q-Drive NQ-0075-S, User Manual, Page: 76 / 80

[CHAPTER 8 Appendix]
8-1 |
DOOCHPUMP
RS-485
- Communication Specification
Article Specification
Communication Speed Choose among 1200/2400/4800/9600/19200bps
Control Proceedure asynchronous communication
Communication System Half duplex system
Letter 8 bit
Stop bit 1 bit
Error Check(CRC16) 1 byte
Parity Check None
* Communication Protocol (ModBus - using RTU protocol)
Code Name
0 X 03 Read Hold Register
0 X 06 Preset Single Register
READ
-Query(Example of reading set pressure)
Start END
3.5byte
Time
X X 0 3 4 0 9 8 0 0 0 1 0 0 0 0
3.5 byte
Time Hex
-Response
Start
3.5byte
Time
x x 0 3 0 2 0 0 3 7 x x x x
-Query(Example of writing the set pressure 5.5bar)
Start END
3.5byte
Time
X X 0 6 4 0 9 8 0 0 0 1 x x x x
3.5 byte
Time Hex
-Response
Start END
3.5byte
Time
X X 0 6 4 0 9 8 0 0 3 7 x x x x
3.5 byte
Time Hex
CRC
Single Write
Slave ID Function Add Hi Add Lo Data Hi Data Lo
3.5 byte
Time Hex
Slave ID Function Add Hi Add Lo Data Hi Data Lo CRC
CRC
Slave ID Function Byte Count Data Hi Data Lo CRC END
Slave ID Function
Start Add
Hi
Start Add
Lo
No Hi No Lo