Extron electronic FOX 2G Tx Configuration, cont’d RS-232 Control of Tx and Rx Units, Receiver

Configuration, cont’d

RS-232 Control of Tx and Rx Units

When the FOX 2G Tx/Rx AV is configured by RS-232 commands, some commands are processed by the transmitter and others are processed by the receiver. The SIS commands do not distinguish between the two units. The system routes the commands based on where they are processed.

A system block diagram showing which functions are processed by the transmitter and which are processed by the receiver is shown below:

Transmitter

Fiber Link 1

Fiber Link 2

(optional)

Receiver

Process

Input configuration Audio gain

Process Color Tint Brightness Contrast Video mute

Output configuration Daisy chain/

loop out mode Audio mute Audio output level

Figure 3-4 — System block diagram

For full functionality, both fiber optic links must be enabled. If only Link 1 is enabled, the ability to configure the system through SIS commands is limited by the lack of return communication from the receiver to the transmitter:

•All configuration carried out using the transmitter will be processed normally because only fiber Link 1 is required.

•Queries from the transmitter about the status of receiver settings will not be processed correctly because fiber Link 2 is required to carry the return signal.

•The receiver cannot be used to configure the transmitter because fiber Link 2 is required.

The lack of communication between the transmitter and the receiver can result in mismatches in the value settings of the two units, which may cause confusion with control systems or software applications. To avoid this confusion, within four seconds of Link 2 becoming active, the receiver settings are automatically copied to the transmitter to ensure settings for both units match.

NWhen the receiver settings are copied to the transmitter, existing transmitter settings are overwritten and it may be necessary to update those values.

3-4 FOX 2G Tx/Rx AV • Configuration