Protocol, Protocol -1, Message functions supported – Yaskawa F7 Modbus User Manual
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Message Formats 2-1
Protocol
The parameter access method supported by the Yaskawa F7 drive is a subset of the MODBUS
®
communication protocol. The F7 drive supports
functions 3, 6, 8 and 10h. The message format varies depending upon the function code of the message. For each function code, there is a
command message from the master and a response message from the slave. The following sections review the format of the command and
response messages for each function.
►
Message Functions Supported
The following table lists the function codes available and their minimum and maximum lengths.
Table 2.1 - Supported Function Codes
Command Message
Response Message (Normal)
Function Code
Function
min. (bytes)
max. (bytes)
min. (bytes)
max. (bytes)
3h (3 dec)
Read Multiple Registers
8
8
7
21
6h (6 dec)
Write Single Register
8
8
8
8
8h (8 dec)
Loop-Back test
8
8
8
8
10h (16 dec)
Write Multiple Registers
11
25
8
8