YASKAWA VS-606V7 Series Instruction Manual page 97

• Read out holding register contents [03H]
Reads out the contents of the holding registers with the continuous numbers for the
specified quantity. The contents of holding register is divided into the upper 8 bits
and the lower 8 bits. They become the data items in response message in the order
of numbers.
Example: Reads out status signal, fault contents, data link status and frequency
reference from the VS-606V7 (slave 2).
Reference message
(at normal operation)
Slave address
Function code
Upper
Start
number
Lower
Upper
Quantity
Lower
Upper
CRC-16
Lower
(For error code 03H, refer to
page 99.)
* Twice as much as the number of reference message.
• Example of loop-back test [08H]
Command message is returned as a response message without being changed. This
function is used to check transmission between the master and the slave. Any
arbitrary values can be used for test codes or data.
Example: Loop-back test of slave 1 and VS-606V7
Reference message
(at normal operation)
Slave address 01H
Function code 08H
Upper 00H
Start
number
Lower 00H
Upper A5H
Quantity
Lower 37H
Upper DAH
CRC-16
Lower 8DH
96
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Response message
(at normal operation)
02H Slave address 02H
03H Function code 03H
00H Number of data* 08H
First
20H Upper 00H
CRC-16
holding
00H
Lower 65H
resistor
04H
Next
Upper 00H
holding
45H
Lower 00H
resistor
F0H
Next
Upper 00H
holding
Lower 00H
resistor
Next
Upper 1H
holding
Lower F4H
resistor
Upper AFH
CRC-16
Lower 82H
Response message
(at normal operation)
Slave address 01H
Function code 08H
Upper 00H
Start
number
Lower 00H
CRC-16
Upper A5H
Quantity
Lower 37H
Upper DAH
CRC-16
Lower 8DH
Reference message
(at fault occurrence)
Slave address 02H
Function code 83H
Error code 03H
Upper F1H
Lower 31H
Reference message
(at fault occurrence)
Slave address 01H
Function code 89H
Error code 01H
Upper 86H
Lower 50H