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Message Block Format - NEC V321-2 Communications Manual

V321-2 : rs232 codes for v321, v421, v461
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ASCII 'B' (42h): Command reply.
ASCII 'C' (43h): Get current parameter from a monitor.
ASCII 'D' (44h): "Get parameter" reply.
ASCII 'E' (45h): Set parameter.
ASCII 'F' (46h): "Set parameter" reply.
th
th
6
-7
bytes) Message Length:
Specify the length of the message (that follows the header) from STX to ETX.
This length includes STX and ETX.
The byte data must be encoded to ASCII characters.
Ex.) The byte data 3Ah must be encoded to ASCII characters '3' and 'A' (33h and 41h).
The byte data 0Bh must be encoded to ASCII characters '0' and 'B' (30h and 42h).

4.2 Message block format

"Message block format" is allied to the "Message Type" in the "Header".
Refer to the section 6 "Message format" for more detail.
1 ÿ Get current parameter
The controller sends this message when you want to get the status of the monitor.
For the status that you want to get, specify the "OP code page" and "OP code",
refer to "Appendix A. Operation code table".
"Message format" of the "Get current parameter" is as follows,
STX
Refer to section 5.1 "Get current parameter from a monitor." for more details.
2 ÿ Get Parameter reply
The monitor will reply with the status of the requested item specified by the controller
in the "Get parameter message".
"Message format" of the "Get parameter reply" is as follows,
Result
STX
Hi
Lo
Refer to section 5.2 "Get parameter reply" for more details.
3 ÿ Set parameter
The controller sends this message to change a setting of the monitor.
Message format of the "Set parameter" is as follows,
OP code
STX
page
Hi
Lo
Refer to section 5.3 "Set parameter" for more details.
Header
OP code page
OP code
Hi
Lo
Hi
OP code
OP code
page
Hi
Lo
Hi
Lo
OP code
Set Value
Hi
Lo
MSB
Message
Check code
ETX
Lo
Type
Max value
Hi
Lo
MSB
ETX
LSB
(4/37)
Delimiter
Current Value
LSB
MSB
LSB
ETX

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