Memobus Rtu Mode - YASKAWA MP920 User Manual

List of MEMOBUS Commands
The commands that make up the MEMOBUS messages are identified by a function code,
and have the functions shown in the following table.
Function Code
01H
02H
03H
04H
05H
06H
08H
0FH
10H
B.2.2

MEMOBUS RTU Mode

Coil Status Read
Command
7
Slave address
Function code: 01H
Start No.
No. of colis
CRC-16
Response
7
Slave address
Function code: 01H
No. of data items
Status of first 8 coils
Status of next 8 coils
Status of next 8 coils
CRC-16
Function
Coil status read
Input relay status read
Holding register write
Input register read
Single coil status change
Single holding register write
Loopback test
Multiple coil status change
Multiple holding register write
0
The function code is 01H when the coil status is read.
(H)
Set the leading address of the coils to be read.
(L)
(H)
Set the number of coils to read.
(L)
(H) Error check
(L)
0
The function code is 01H when the coil status is read.
The byte length of the read data is returned.
The read data contents are returned.
(H)
Error check
(L)
B-19
B.2 MEMOBUS Messages
MEMOBUS MEMOBUS
(RTU) (ASCII)
2,000 points 976 points
2,000 points 976 points
125 words 61 words
125 words 61 words
1 point 1 point
1 word 1 word
− −
800 points 800 points
100 words 59 words
B