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Connection By General-purpose Communication - Mitsubishi Electric F930GOT-BWD-E User Manual

Graphic operation terminal.
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Graphic Operation Terminal F930GOT
1.12

Connection by general-purpose communication

The GOT can be connected to a general controller such as a micro computer board.
(The connected 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. Inside the GOT, there is a data area to hold
word data and bit data. The host unit can read from and write to the data area using com-
munication 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.
GOT
Screen data
Display/Input
Internal data
Host unit
(micro computer board)
RS-422 or
RS-232C
Introduction 1
1-27

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