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Chapter 4 Parameter Settings|DD Series
4-67
14: 8E1 (RTU)
15: 8O1 (RTU)
16: 8E2 (RTU)
17: 8O2 (RTU)
1. Control by PC or PLC
A VFD-VL can be set up to communicate on Modbus networks using one of the following modes: ASCII
(American Standard Code for Information Interchange) or RTU (Remote Terminal Unit). Users can select the
desired mode along with the serial port communication protocol in Pr.09-04.
Code Description:
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
‘0’ ‘1’ ‘2’ ‘3’ ‘4’ ‘5’ ‘6’ ‘7’
ASCII code
30H 31H 32H 33H 34H 35H 36H 37H
Character
‘8’ ‘9’ ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ ‘F’
ASCII code
38H 39H 41H 42H 43H 44H 45H 46H
2. Data Format
10-bit character frame (For ASCII):
( 7.N.2)
( 7.E.1)
Start
bit
0123456
Stop
bit
10-bit character frame
( 7.O.1)
Odd
parity
Start
bit
0
12
3456
Stop
bit
10-bit character frame
Even
parity
Start
bit
01234
5
6
Stop
bit
7-bit character
10-bit character frame
Stop
bit
7-bit character
7-bit character