NEC UN552S External Controls - Page 21

NULL Message

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5.5.3 NULL Message Command code STX ETX 'B' 'E' The NULL message returned from the monitor is used in the following cases;  To tell the controller that the monitor does not have any answer to give to the host (not ready or not expected)  A null message will be returned by the monitor if the "Start Proof of Play" command is sent and the monitor has already started Proof of Play.  A null message will be returned by the monitor if the "Stop Proof of Play" command is sent and the monitor has not started Proof of Play.  Complete "NULL Message" command packet as follows; 01h-30h-30h-41h-42h-30h-34h-02h-42h-45h-03h-CHK-0Dh SOH-'0'-'0'-'A'-'B'-'0'-'4'-STX-'B'-'E'-ETX-CHK- CR (21/145)

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5.5.3 NULL Message
The NULL message returned from the monitor is used in the following cases;
To tell the controller that the monitor does not have any answer to give to the host (not
ready or not expected)
A null message will be returned by the monitor if the
“
Start Proof of Play
”
command is
sent and the monitor has already started Proof of Play.
A null message will be returned by the monitor if the
“
Stop Proof of Play
”
command is sent
and the monitor has not started Proof of Play.
Complete "NULL Message" command packet as follows;
01h-30h-30h-41h-42h-30h-34h-02h-42h-45h-03h-CHK-0Dh
SOH-'0'-'0'-'A'-'B'-'0'-'4'-STX-'B'-'E'-ETX-CHK- CR
STX
Command code
ETX
'B'
'E'