Access Specific Inputs; Flow Control - Christie Matrix StIM-WQ User Manual

Serial Communication

Access Specific Inputs

For several commands (for example, BGC, Base Gamma Curve) you can direct the message to
particular input or image. To do this, include a subcode after the function code.
Example:
(BGC 1) Select 2.22 gamma curve for main input.
(BGC+MAIN 1) Select 2.22 gamma curve for main input.
It is only possible to set parameters from a specific input if that parameter is stored separately for
each input. This function cannot be used for parameters that are specified for the projector as a
whole such as projector address. The serial commands listed in the document specify which subcodes
are applicable to each function.

Flow Control

Xon and Xoff controls apply to both directions of communication. The projector will not send
more than 3 characters after it has received a 13h (Xoff) code.
Normally messages can be sent to the projector before processing of earlier messages is complete—
the projector will just store messages in a buffer until ready to process. However, if a series of
messages is sent it is possible that the projector may not be able to process them as fast as they
arrive and the buffer will become full. If this happens, the projector will send the 13h (Xoff) code to
instruct the controller (or any devices preparing to transmit) to cease transmission. At this point, the
controller must respond immediately and send no more than 10 extra characters or they may be lost
(i.e., the projector is able to accommodate the receipt of up to 10 more bytes after it sends 13h
(Xoff). When the buffer is once again available, the projector will send a 11h (Xon) command to
resume transmission.
84 Matrix StIM™ WQ/SIM WQ User Manual
020-100883-01 Rev. 2 (06-2013)