C.8 Message Examples
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 557
MEMOBUS/Modbus
Communications
C
C.8 Message Examples
Below are some examples of command and response messages.
Reading Drive 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 status
signals, error details, data link status, and frequency
references from the slave 2 drive.
Loopback Test
Function code 08H performs a loopback test. This test returns a response message with exactly the same content as the
command message and can be used to check communications between the master and slave. User-defined test code and
data values can be set.
The following table shows a message example when
performing a loopback test with the slave 1 drive.
Command Message Response Message (normal) Response Message (fault)
Slave Address 02H Slave Address 02H Slave Address 02H
Function Code 03H Function Code 03H Function Code 83H
Starting No.
Upper 00H Data Quantity 08H Error Code 03H
Lower 20H
1st storage register
Upper 00H
CRC-16
Upper F1H
Data Quantity
Upper 00H Lower 65H Lower 31H
Lower 04H
Next storage
register
Upper 00H
CRC-16
Upper 45H Lower 00H
Lower F0H
Next storage
register
Upper 00H
Lower 00H
Next storage
register
Upper 01H
Lower F4H
CRC-16
Upper AFH
Lower 82H
Command Message Response Message
Slave Address 01H Slave Address 01H
Function Code 08H Function Code 08H
Test Code
Upper 00H
Test Code
Upper 00H
Lower 00H Lower 00H
Data
Upper A5H
Data
Upper A5H
Lower 37H Lower 37H
CRC-16
Upper DAH
CRC-16
Upper DAH
Lower 8DH Lower 8DH
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