Mitsubishi Electric F920GOT-BBD-K-E, Hardware Manual

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GOT-F900 SERIES (CONNECTION) Connection of Microcomputer 14
14-6
14.3 Outline of Communication and Specifications
When the GOT-F900 is connected to the microcomputer, the outline of data transfer and the
communication specifications should be set as described below.
14.3.1 Outline of Communication
1) Outline
In microcomputer connection, the microcomputer functions as the master station, and the GOT-F900
functions as the slave station. The GOT-F900 is equipped with the built-in data area in which word
data and bit data are stored. The microcomputer executes read and write to this internal data area
using communication commands.
2) Screen display and outline of control
The display and the contents of control in the GOT-F900 are determined by the screen data created
by the screen creation software installed in the personal computer. The screen data specifies the
layout of objects displayed on the screen or actions to be executed when touch keys are pressed.
Some functions access the data such as the function to display word devices in the "numeric value"
or "bar graph" format and the function to change the bit data status by "switches" access the data in
the internal data area. The access target in such cases is the internal data area. The location of the
data to be accessed is specified by the screen data.
3) Write command and read command
When the data stored in the microcomputer is to be displayed on the screen, the microcomputer
should transfer it to the internal data area of the GOT-F900 using the write command. The transfer
destination is specified by the screen data. The result of data change by the key operation can be
transferred from the internal data area of the GOT to the microcomputer if the microcomputer gives
the read command. As the trigger of change, the interrupt code can be transmitted.
GOT-F900
Screen data
Display
Input
Internal data
memory
Write/read command
Microcomputer
Screen display
RS-422 or
RS-232C
Interrupt output
Microcomputer
Screen display
1234
GOT-F900
Internal data memory
D0(H), D0(L)
D1(H), D2(L)
D3(H), D3(L)
D4(H), D4(L)
D5(H), D5(L)
0000, 0001
0002, 0003
0004, 0005
0006, 0007
0008, 0009
Address
specified by the
microcomputer