Proxima PL-300E User's Guide download pdf (Page 24)

Connecting to a Control Signal (continued)

Procedure for checking projector status.

1. The computer sends the command ’20H’ + ‘yyH’ to the projector.

2. The projector replies with the command ‘1xH’ + ‘yyH’ + data bytes.

Procedure for setting projector status

1. The computer sends the command ‘3xH’ + ‘yyH’ + data bytes.

2. The projector changes its status.

3. The projector replies with the command ‘1xH’ + ‘yyH’ + data bytes to indicate its newstatus.

Caution

Data bytes in step 3 are not always same as data bytes in step 1.

If the projector cannot accept the status of the step 1 data bytes, the projector will set the proper

status and reply with this new data bytes setting to the computer, or the projector will reply

with the error reply ‘0xH’ + ‘yyH’ + data bytes that are the same as those sent in step 1.

Resetting the defaults

1. The computer sends the command ’40H’ + ‘yyH’

2. The projector changes its status to the default setting.

3. The projector replies with the command ‘1xH’ + ‘yyH’ + data bytes to the computer to indicate a return to

default settings.

NOTE: If the projector sends a ‘4Dh’ before the command code, the computer will ignore the ‘4Dh’.

Sample of command error

1. The computer sends the command ‘2xH’, ‘3xH’ or ‘4xH’ + ‘yyH’ + data bytes.

2. The projector doesn’t understand this code.

3. The projector replies with the command ‘00H’ + ‘yyH’

Sample of data error

1. The computer sends the command ‘2xH’, ‘3xH’ or ‘4xH’ + ‘yyH’ + data bytes.

2. The projector doesn’t understand these data bytes.

3. The projector replies with the command ‘0xH’ + ‘yyH’ + data bytes (same as step 1).

Sample of framing error

1. The projector detects a framing error.

2. The projector changes to 1200bps 7N1 if not currently set at 1200bps 7N1.

3. The projector replies with ’70H’ + ’70H’ 10 times, every 1 second.

4. When projector receives ’70H’ + ’70H’, it replies ’12H’ + ’03H’ + ’01H’ + ’00H’.

Command byte and data byte interval error

1. If the interval of bytes exceeds 500mS, the projector replies with ’70H’ + ’70H’.

2. Projector waits 1 second for a return command from the computer.

3. If there is no command from the computer, the projector treats it as a framing error.

NOTE: The interval of command bytes and data bytes must be over 1mS and under 500mS.

If it is under 1mS, it may be treated as a framing error. The interval between reply codes and other

codes must be over 40mS.

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Proxima PL-300E User's Guide Page 24