Delta Electronics AFE075A43A User Manual page 88

Chapter 11 Description of Parameter SettingsAFE2000 Series
 Control by PC or PLC (Computer Link)
 An AFE2000 unit 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 RS-485 serial port communication protocol in Pr.09-00.
 MODBUS ASCII （American Standard Code for Information Interchange） : Each byte 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).
1. Code Description
Communication protocol is in hexdecimal, ASCII: "0", "9", "A", "F", every 16 hexdecimal represent
ASCII code. For example:
Character
ASCII code
Character
ASCII code
 Data Format
10-bit character frame (For ASCII):
（7, N , 2）
Start
bit
（7 , E , 1）
5：7，O，2 for ASCII
6：8，N，1 for ASCII
7：8，N，2 for ASCII
8：8，E，1 for ASCII
9：8，O，1 for ASCII
10：8，E，2 for ASCII
11：8，O，2 for ASCII
12：8，N，1 for RTU
13：8，N，2 for RTU
14：8，E，1 for RTU
15：8，O，1 for RTU
16： 8，E，2 for RTU
17：8，O，2 for RTU
'0' '1'
30H 31H
'8' '9'
38H 39H
0 1 3
2
7-data bits
10-bits character frame
'2' '3' '4'
32H 33H 34H
'A' 'B' 'C'
41H 42H 43H
4 5 6
11-86
'5' '6'
35H 36H 37H
'D' 'E'
44H 45H 46H
Stop
Stop
bit
bit
'7'
'F'