Mitsubishi F940GOT-SWD-E Operation Manual page 36

Graphic Operation Terminal F940GOT
• Communication procedure
In communication between the GOT and the host unit, the host unit sends a command, and
the GOT sends back a response. While the GOT is sending the response to the host unit,
the GOT cannot receive new commands.
Host unit
Command
GOT
When an error occurs, the GOT sends back a NAK code as a response. The contents of the
error can be checked by reading a special memory.
As an exception, when the GOT gives a notification for interrupt, the GOT sends an interrupt
code. However, while the GOT is sending a response, it does not sends an interrupt code. In
such a case, immediately after sending a response, the GOT sends an interrupt code. The
GOT may send an interrupt code while receiving a command.
Host unit
GOT
When an event such as change in the ON/OFF status of a specific bit and screen change
over has occurred, the GOT sends an interrupt code. The table below shows the correspon-
dence between the interrupt code and the event type.
Event type
M8000 is changed to ON.
M8000 is changed to OFF.
M8000 is changed to ON.
M8000 is changed to OFF.
M8000 is changed to ON.
M8000 is changed to OFF.
M8000 is changed to ON.
M8000 is changed to OFF.
The display screen is changed
over.
Input of a numeric is com-
pleted.
Transfer of a data file is com-
pleted.
Command
Response
Interrupt
Interrupt code
(hexadecimal)
.
.
.
.
.
.
Command
Response
50
51
52
53
7E
7F
B2
B3
20
21
22
Response
Introduction 1
1-22