Mitsubishi F940GOT-LWD-E, Руководство по эксплуатации

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Graphic Operation Terminal F940GOT Introduction 1
1-20
1.6.5 Connection by general-purpose communication
The GOT can be connected to a general controller such as a micro computer board. (The con-
nected controller is hereafter referred to as "host (unit)".)
• Outline
In general-purpose communication, the host unit is connected to the GOT via the RS-422/
RS-232C and functions as the parent station in communication. Inside the GOT, there is a
data area to hold word data and bit data. The host unit can read and write the data area
using communication commands.
The contents of display and control in the GOT are determined by the screen data created
using the screen creation software in the personal computer. The screen data specifies the
layout of objects displayed on the screen, and specifies actions to be performed by pressing
of touch keys.
The GOT is equipped with the function to display the word data in the form of numerics and
bar graphs, the function to access the data for changing the status of the bit data using
switches, etc. The target of access at this time is the data area inside the GOT. The data
location to be accessed is specified by the screen data.
Accordingly, to display the data stored in the host unit on the screen, the host unit should
transfer the data to the data area inside the GOT using write commands. The transfer desti-
nation is a location specified by the screen data. The data change result by manipulation of
keys can be transferred from the data area inside the GOT to the host unit if the host unit
gives read commands. In general-purpose communication, interrupt codes can be sent as
change triggers.
Screen data
Display/Input Internal data
RS-422
or
RS-232C
Host unit
(micro computer board, etc.)
GOT