4 Command control
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PJ04030102B
4
Command control
4.1
NULL command
In using CEDIA commands, it is used in order to confirm whether transmission is possible.
It is used to confirm whether the external controller and the projector are properly connected.
Command code
Table 4-1 NULL CMD
HEX
ASCII
Function
Operation
Reference
0x00
0x00
NULL
NULL
NULL command
-
Parameter
None
4.1.1
Operation
Use the command as shown in the following examples.
Purpose: To confirm whether the external controller and the projector are properly
connected.
(1) Data is transmitted from the external controller to the projector as follows.
1: External controller →
0x21
0x89
0x01
0x00
0x00
0x0A
'!'(Operation)
PJ
Individual:1
NULL
NULL
End
(2) If the external controller and the projector are connected and the projector is operating normally, the projector returns an ACK to
the external controller as a NULL command response.
2: ← Projector
0x06
0x89
0x01
0x00
0x00
0x0A
ACK
PJ
Individual : 1
NULL
NULL
End
By the above exchange, it can be confirmed whether the connection and communication are normal or abnormal.
4.1.2
Reference
N/A