ViewSonic VS12417 User Manual page 64

Requesting projector status (Get command)
(1) Send the following request code from the PC to the projector.
Header + Command data ('02H' + '00H' + type (2 bytes) + '00H' + '00H')
(2) The projector returns the response code '1DH' + data (2 bytes) to the PC.
Changing the projector settings (Set command)
(1) Send the following setting code from the PC to the projector.
Header + Command data ('01H' + '00H' + type (2 bytes) + setting code (2
bytes))
(2) The projector changes the setting based on the above setting code.
(3) The projector returns the response code '06H' to the PC.
Using the projector default settings (Reset Command)
() The PC sends the followng default settng code to the projector.
Header + Command data ('06H' + '00H' + type (2 bytes) + '00H' + '00H')
(2) The projector changes the specified setting to the default value.
(3) The projector returns the response code '06H' to the PC.
Increasing the projector setting value (Increment command)
() The PC sends the followng ncrement code to the projector.
Header + Command data ('04H' + '00H' + type (2 bytes) + '00H' + '00H')
(2) The projector increases the setting value on the above setting code.
(3) The projector returns the response code '06H' to the PC.
Decreasing the projector setting value (Decrement command)
() The PC sends the followng decrement code to the projector.
Header + Command data ('05H' + '00H' + type (2 bytes) + '00H' + '00H')
(2) The projector decreases the setting value on the above setting code.
(3) The projector returns the response code '06H' to the PC.
When the projector cannot understand the received command
When the projector cannot understand the received command, the error code '15H'
is sent back to the PC.
Sometimes the projector cannot properly receive the command. In such a case,
the command is not executed and the error code '15H' is sent back to the PC. If
ths error code s returned, send the same command agan.
When the projector cannot execute the received command
When the projector cannot execute the received command, the error code '1CH' +
'xxxxH' is sent back to the PC.
When the data length is greater than indicated by the data length code, the
projector ignore the excess data code. Conversely when the data length is shorter
than indicated by the data length code, an error code will be returned to the PC.
NOTE • Operation cannot be guaranteed when the projector receives an undefined
command or data.
• Provide an interval of at least 40ms between the response code and any other code.
• The projector outputs test data when the power supply is switched ON, and when the
lamp s lt. Ignore ths data.
• Commands are not accepted durng warm-up.
ViewSonic
RS-232C Communication (continued)
59
PJL32