Appendix A • RS-232 Programmer’s Guide

System 4xi -Initiated Messages

When AC power is initially applied to the System 4xi, the following System 4xi- initiated messages (underlined) are sent to the Host:

¿(C)COPYRIGHT 1997, EXTRON ELECTRONICS SYSTEM4LQxi, V4.0¿ * ¿SYS 1¿ System 4xi power is ON

¿Ax¿ x = the Audio channel number selected

¿Vx¿ x = the Video channel number selected

* This message will vary depending on the System 4xi model.

When the Main power from the front panel is applied to the System 4xi, the following System 4xi-initiated messages are sent to the Host:

¿SYS x¿ (as described above)

¿Ax¿ (as described above)

¿Vx¿ (as described above)

When audio and/or video settings are changed using the front panel, the following messages or message combinations are sent to the Host:

¿Ax¿ (as described above)

¿Vx¿ (as described above)

¿Cx¿ Both video and audio settings for channel number x have been changed

When there is a change in the audio gain setting from the front panel, the following message is sent to the Host:

¿RECONFIG¿

Extron • System 4xi Switcher Series • User’s Manual

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Extron electronic 4LQXI, 4LDXI System 4xi -Initiated Messages, This message will vary depending on the System 4xi model