4 Modbus Communications Procedure
4 - 14
E5
C-T Digital Temperature Controllers Programmable Type Communications Manual (H186)
Command Frame
Response Frame
Note: When the command is executed normally, the response returns the same data sent in the command.
(1) Test Data
Enter any 2-byte hexadecimal data.
(2) Response Code
(3) Example Command and Response
The following example shows the command/response for an Echoback Test command.
(In this case, the test data is H'1234.)
(In this case, the slave address is H'01.)
4-4-4 Echoback Test
Function code
Error
code
Name
Description
H
'
88
H
'
03
Variable data error
A different value (not H
'
00, H
'
00) was
returned.
H
'
08
---
Normal completion
No errors were found.
CRC-16
1
2
2
1
H
'
0
8
H
'
00
H
'
00
Test data
2
b
ytes
Sla
v
e
address
F
u
nction
code
Fixed data
CRC-16
1
2
2
1
H
'
0
8
H
'
00
H
'
00
Test data
2
b
ytes
Sla
v
e
address
F
u
nction
code
Fixed data
01
0
8
00 00
01
0
8
00 00
12 34
12 34
ED 7C(CRC-16)
ED 7C(CRC-16)
Command:
Response:
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