Best E5 Series User Manual page 195

E5 User Manual
Address
01
Response frame of #1 machine is as below:
Address
01
ASCII:
1） Frame header is "0x3A" while the default frame end is "0x0D" "0x0A"; also, frame
end can be configured and defined by user;
2） In ASCII mode, all data bytes other than frame header and end are sent in the form
of ASCII code; high-4-bit byte and low-4-bit byte are sent successively;
3） In ASCII mode, the data is 7-bit long. For 'A'~'F', their uppercase ASCII codes are
used;
4） Data is subjected to LRC check which covers the information portion from slave
address to data;
5） Check sum is equal to the complement of sum of characters that participate in data
check (abort the feed bit).
In ASCII mode, data frame format is as follows:
Start: "0 x
起始:
3A
"0x3A"
Examples of Modbus data frame in ASCII mode are as follows.
The writing of 4000 (0xFA0) into internal register 002 of #1 slave is shown in the table
below.
LRC check = complement of (01+06+00+02+0x0F+0xA0) = 0x48
Hea
Address
der
Character : 0
Table 7-1
Function code
03
Function code
03
ASCII data frame format
Slave
Parameter
从机地址 address 功能码
Table 7-3
Paramet
Register address
er
1 0 6 0
Register
Read words
address
00 02
Table 7-2
Register
Read words
address
02
ASCII数据帧格式
Modbus message
Modbus报文
Data
数据
Write-in content
0 0 2 0
- 191 -
Chapter 7 Modbus Maintenance
Check sum
00 01
Check sum
13 88
Check
校验
LRC
check
F A 0 4 8
25 CA
B5 12
End: 0xD,
结束:
0xA
"0xD,0xA"
End
CR LF