Message Examples; C.8 Message Examples - YASKAWA D1000 Series Instruction Manual

C.8 Message Examples

Below are some examples of command and response messages.
◆ Reading Converter MEMOBUS/Modbus Register Contents
Using the function code 03H (Read), a maximum of 16 MEMOBUS/Modbus registers can be read out at a time.
The following table shows message examples when reading error details and data link status from the slave 2 converters.
Command Message
Slave Address
Function Code
Starting No.
Data Quantity
CRC-16
◆ Loopback Test
Function code 08H performs a loopback test that returns a response message with exactly the same content as the
command message. The response message can be used to check communications between the master and slave.
User-defined test code and data values can also be set.
The following table shows a message example when performing a loopback test with the slave 1 converter.
Command Message
Slave Address
Function Code
Upper
Test Code
Lower
Upper
Data
Lower
Upper
CRC-16
Lower
YASKAWA ELECTRIC TOEP C710656 07A YASKAWA Power Regenerative Converter - D1000 Instruction Manual
02H
03H
Upper 00H
Lower 21H
Upper 00H
Lower 02H
Upper 94H
Lower 32H
Response Message (normal)
01H Slave Address
08H Function Code
00H
Test Code
00H
A5H
Data
37H
DAH
CRC-16
8DH
Response Message (normal)
Slave Address
Function Code
Data Quantity
1st storage register
Next storage register
CRC-16
01H
08H
Upper 00H
Lower 00H
CRC-16
Upper A5H
Lower 37H
Upper DAH
Lower 8DH
C.8 Message Examples
02H
03H
04H
Upper 00H
Lower 00H
Upper 00H
Lower 00H
Upper C9H
Lower 33H
Response Message (fault)
Slave Address
Function Code
Error Code
Upper
Lower
01H
88H
01H
86H
50H
C
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