Bedienungsanleitung Polycom Vortex EF2280 (Seite 6 von 105) (Englisch)

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values and then send commands to the Vortexes to set them to the same state. This approach has significant

disadvantages since initializing the host program could undo settings made by other host programs or by the

front panel controls of one of the linked Vortex devices. A better approach is to query the linked Vortex devices

for their status and set the host program controls based on the return values.

3.2. Wildcard Characters

The use of the wildcard character, '*', can make programming the host controller much easier. Be careful when

using wildcards, however, since they can generate a lot of traffic on the digital bus.

3.3. Using Acknowledgements

It is a good idea for the host program or control system to make sure that all connected Vortex devices have

acknowledgment mode enabled (see the

ACKMOD command). When acknowledgment mode is on, a Vortex

device will send an acknowledgment for each command it receives. Proper use of acknowledgments makes the

host program more robust and makes supporting multiple hosts effortless. The rest of this section describes how

to use acknowledgments to achieve these goals.

As a convenient example, let us imagine a host program with a graphical user interface (GUI). The user presses

buttons on the GUI to enable or disable features of various linked Vortex devices. The buttons on the GUI reflect

the current status of the corresponding feature.

When the user presses a button on the GUI to enable or disable a feature, the host program should send the

corresponding command to the selected Vortex device. It may be tempting to update the status of the GUI

button at this point, but this can cause problems if there are transmission errors or if there are multiple host

controllers. The proper way to handle this is to only update the GUI controls based on acknowledgments

received from the Vortex device.

To implement this, organize your code so that the functions that send commands are totally separate from the

functions that receive responses from the Vortex devices. This also enables your host program to support the

presence of multiple host controllers. For example, consider the following sequence of events.

1. Another host sends a command to a Vortex device.

2. The Vortex device responds with an acknowledgment that is broadcast to all of the other hosts.

3. Your host program receives the acknowledgment and updates the status of the corresponding control.

The result of this programming model is that all hosts and linked Vortex devices will always be synchronized.

For simple on/off features, your host program can make use of the toggle arguments to some commands (e.g.,

'SSEN2'). By sending a toggle command when a button is pressed, and updating the button based on

acknowledgments, your host program will not have to keep track of the status of the button.

In a similar fashion, many of the integer commands (such as gains) can be controlled by incrementing or

decrementing them by a specific amount. For example, the command 'GAINIA>1 ' increments the input gain on

channel A by 1 dB. The acknowledgment for this command will return the actual value that the gain was

incremented to. Thus, to implement a volume control, your control program can send a command to increment

the gain by 1 dB when the "up" button is pressed and decrement the gain by 1 dB when the "down" button is

pressed. The control can update its level indicator based on the acknowledgment that is received.

3.4. Macros and Presets

Although macros and presets are similar, there are times when using one is better than the other. Presets store

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