Extron Electronics VN-COMMANDER - Manual (Page 134)

Appendix B: Serial Commands VN-COMMANDER User Guide
124 I456GB issue 8
Control of External Devices
Enabling Serial Control To enable external devices to be controlled they will need
to be connected to the ‘Data TX’ output of one of the
computer’s serial (RS-232) ports.
These ports are usually identified as COM x , where x is a
number from 1 to 4 ( e.g. COM2). You must ensure that the
appropriate serial port is configured correctly, by
following the instructions on pages 36 and 40.
Control Options Serial data strings can be included within scenes (see
page 71). In a scene, three strings can be transmitted:
• •• • Pre
(as soon as the scene is selected but not yet fully
displayed);
• •• • Post
(when the scene display is fully complete);
• •• • Exit
(when another scene is selected but before the Pre
commands of the new scene).
These commands can be used to control external source
switchers or other RS-232 controllable devices.