Delta MS300 Series User Manual page 791

Appendix A. Modbus ProtocolMS300
 This appendix helps users to control by computers and monitor drive parameters and status
through Modbus by using RS-485 serial communication interface
 When using the communication interface, the diagram on the
right shows the communication port pin definitions. It is
recommended that you connect the AC motor drive to your PC
by using Delta IFD6530 or IFD6500 as a communication
converter.
 The default communication formats for communication port:
Modbus ASCII mode
1.
9600 bps serial communication baud rates
2.
7-bit data character
3.
No calibration
4.
2 stop bit
5.
 Modbus ASCII (American Standard Code for Information Interchange): Each byte of data is the
combination of two ASCII characters. For example, one byte of data: 64 Hex, shown as '64' in
ASCII, consists of '6' (36Hex) and '4' (34Hex)
A-1 Code Description
The communication protocol is in hexadecimal, ASCII: "0"..."9", "A"..."F", every hexadecimal value
represents an ASCII code. The following table shows some examples.
Character
ASCII code
Character
ASCII code
A-2 Data Format
10-bit character frame (For ASCII):
(7, N, 2)
Start
0
bit
(7, E, 1)
Start
0
bit
'0' '1'
30H 31H 32H
'8' '9'
38H 39H 41H
1 3
2
7-data bits
10-bits character frame
1 3
2
7-data bits
10-bits character frame
'2' '3' '4'
33H 34H
'A' 'B' 'C'
42H 43H
Stop
4 5 6
bit
4 5 6
782
'5' '6'
35H 36H
'D' 'E'
44H 45H
Stop
bit
Even
Stop
parity
bit
'7'
37H
'F'
46H