Delta Electronics VFD-M Series User Manual page 95

Chapter 4 Parameters|
Each drive has a built-in RS-485 serial interface, marked (RJ-11 Jack) on the control terminal
block, whose pins are defined as shown:
Either ASCII or RTU Modbus protocols are used for communication. Users can select the
desired mode along through parameters Pr.92 and Pr.113.
Each VFD-M AC drive has a pre-assigned communication address specified by Pr.88. The
master controller communicates with each AC drive according to its particular address.
Code Meaning:
ASCII mode:
Each 8-bit data is the combination of two ASCII characters. For example, a 1-byte data: 64 Hex,
shown as '64' in ASCII, consists of '6' (36Hex) and '4' (34Hex).
Character
ASCII code
Character
ASCII code
RTU mode:
Each 8-bit data is the combination of two 4-bit hexadecimal characters. For example, 64 Hex.
2. Data Format
2.1 10-bit character frame (For 7-bit character):
4-60
1
6
'0' '1'
30H 31H 32H
'8' '9'
38H 39H 41H
( 7.N.2 : Pr.92=0)
Start
0 1 2
bit
7-bit character
10-bit character frame
( 7.E.1: Pr.92=1)
Start
0
1 2
bit
7-bit character
10-bit character frame
( 7.O.1:Pr.92=2)
Start
0 1 2
bit
7-bit character
10-bit character frame
1: +15V
2: GND
3: SG-
4: SG+
5: NC
6: for communication
'2' '3' '4'
33H 34H
'A' 'B' 'C'
42H 43H
3 4 5 6
3 4 5 6
3 4 5
'5' '6'
35H 36H
'D' 'E'
44H 45H
Stop
Stop
bit
bit
Even
Stop
parity
bit
Odd
Stop
6
parity
bit
Revision May 2008, ME14, SW V3.04
'7'
37H
'F'
46H