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10-1
Chapter: 10 Description for Computer Link Operation
When connected to a host computer with a network module that is compatible with the ME-NET
specifications, the JW-21MN can transfer data.
10-1 Computer link function
The host computer communicates with each station number one by one. On the computer link, the
host computer can communicate with any required station regardless of whether it is the master or
slave station.
(1) The host computer instructs station number/communication contents/memory address/data etc. of
the communicating station as a "command."
(2) The "command" receiving station processes this data and returns the result as "response."
In order to use the computer link function above, the host computer needs program application
software. For programming this software, see the instruction manual attached with the network
module.
Computer link commands of the ME-NET can be roughly classified into basic commands and
optional commands.
[1] Basic commands
Commands mainly used with PCs.
These commands are the functions used to read and write relays and registers. The JW-21MN
supports all of the basic commands (for both the 47 and 57 family). See the next page.
Reference
The 47 and 57 family: ME-NET computer link commands are divided into the 47 and 57 families of
commands, which use different communication formats. However, you do not
need to be concerned about the differences in these families when using the
computer link function.
[2] Optional commands
Commands other than the basic commands. These are individual commands specific to each device.
See page 10-3.
Master station (00) Slave station 01(8)
Command
Response
Host computer
Slave station 02(8) Slave station 03(8)
System example