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Connection to the control signal terminal (continued)
The procedure
of getting the Projector status
(1)Computer
sends the command '20H'+'yyH'
to Projector.
(2)Projector
reply the command
'lxH'+'yyH'+data
bytes.
The procedure
of setting the Projector status
(l)Computer
sends the command
'3xH'+'yyH'+data
bytes.
(2)Projector
changes it's status.
(3)Projector
reply the command
'lxH'+'yyH'+data
bytes which indicate status.
@9
. (3) data bytes is not always same as (1) data bytes. If projector cannot realize the status of(1)
data bytes, projector set the proper status and reply this new setting data bytes or projector
reply the error reply 'OxH'+'yyH+data
bytes same as (l).
When only power control (POWER COMMAND)
is performed,
it takes about 2-140
seconds
between sending set code and receiving
answering
code.
The procedure
of default setting the Projector status
(l)Comput.er
sends the command
'40H+'yyH
(2)Projector
changes it's status to default setting.
(3)Projector
reply the command 'lxH'+'yyH'+data
bytes which indicate default.
The example of command
error
When projector cannot accept command from PC, error code 'OOH+'YYH' is sent back.
(in a case when command code '2xH', '3xH' or '4xH'+'yyH'+data
is sent from PC to projector)
The example of data error
When projector cannot accept command from PC, error code with data 'OOH'+'yyH'+data
is sent back as it
is. (in a case when command code '2xH', '3xH' or '4xH'+'yyH+data
is sent from PC to projector)
When data is longer than required data code length, projector ignores excess data code.
When data is shorter than required data code length, projector sends back error code shown above.
The example of framing error
Projector sends error code '70H'+'70H'
up to 10 times at intervals of 1 second until any answer is received.
The interval of command
bytes and data bytes
After command code '2xH', '3xH' or '4xH' is sent from PC, if command or data is not sent within 500ms,
projector sends back error command
'70H+70H.
If no answer is sent within 1 second from that time,
framing error is assumed.
@i9
. The interval of command bytes and data bytes must be over 1mS and under 500mS.
If it is
under lmS, it may be treat as framing error.
. After projector has sent back answer code, when next command is to be sent from PC, allow
for an interval of 40ms or more between answer code and other code.
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