NEC V321-2 Communications Manual page 28

'0'-'4'(30h, 34h): Enable, once
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 "Check code" for a BCC calculation.
Delimiter
CR (0Dh): End of packet
The controller requests the monitor to write Enable/Disable Schedule.
3)
Header
SOH-'0'-Monitor ID-'0'-'A'-'0'-'A'
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID of which you want to change a setting.
'0' (30h): Message sender is the controller.
'A' (41h): Message type is "Command".
'0'-'A'(30h, 41h): Message length
Message
STX (02h): Start of Message
'C'-'2'-'1'-'5' (43h, 32h, 31h, 35h): Enable/Disable Schedule writes command
PG-EN: Enable/Disable Schedule data
PG: Program No.
'0'-'0'(30h, 30h): Program No.1
'0'-'6'(30h, 36h): Program No.7
EN: Enable /Disable
'0'-'0'(30h, 30h): Disable
'0'-'1'(30h, 31h): Enable
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 "Check code" for a BCC calculation.
Delimiter
CR (0Dh): End of packet
4) The monitor replies a data for confirmation.
Header
SOH-'0'-'0'-Monitor ID-'B'-'0'-'C'
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'0' (30h): Message receiver is the controller.
Monitor ID: Indicate a replying Monitor ID.
'B' (42h): Message type is "Command reply".
'0'-'C' (30h, 43h): Message length
Message
STX (02h): Start of Message
'C'-'2'-'1'-'5' (43h, 32h, 31h, 35h): Enable/Disable Schedule writes reply command
ST: Enable/Disable Schedule Status command
'0'(30h): No error
'1'(31h): Error
PG-EN: Enable/Disable Schedule data
PG: Program No.
Ex.) If Monitor ID is '1', specify 'A'.
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STX-'C'-'2'-'1'-'5'-ST-PG-EN-ETX
Ex.) When this byte is set to 'A', the replying Monitor ID is '1'.
Message
STX-'C'-'2'-'1'-'5'-PG-EN-ETX
Message
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Check code Delimiter
BCC CR
Check code Delimiter
BCC CR