YOKOGAWA F3SP71-4S, User Manual

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3-3
IM 34M06P15-03E 2nd Edition: Jan. 31, 2012-00
3.3 Read Holding Registers ($03)
Reads the value(s) of a single or multiple holding registers.
The amount of devices that can be accessed with a single request is 1 to 125 points.
Request Format (Master => Slave)
F030103.VSD
Function Code Data
$03
1-byte 2-byte 2-byte
Starting Holding Register Nos.
($0000 to $FFFF)
Read Points
($0001 to $007D)
Response Format (Slave => Master)
(At Normal Completion)
Function Code
Data
$03
1-byte
Read Length
nx2
($02 to $FA)
1-byte 2-byte
Device Data
1
Device Data
n
2-byte
···
(At Faulty Completion)
Function Code
Data
$83
1-byte
Error Code
1-byte