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NXC-VOL4 Volume Control Card
39 NetLinx Cardframe, Control Cards, and NetModules
NXC-VOL4 Channel Assignments
The NXC- VOL4 channel assignments are listed in the following table. This card has 2 ports with 2 audio
"channels" in each port. The two audio "channels", which can be used as right and left, should not be confused
with the
channel assignments , which are sent to and from the card.
Ramping a volume channel while the mute channel is on will not automatically turn off the mute channel but
the ramping will still occur; the volume change will be noticed when the mute channel is turned off. For setting
ramp rates and presets, refer to the
Programming Information section on page 40.
NXC-VOL4 Levels
Volume (audio) channels 1 and 2 use levels 1 and 2 respectively. For reading current volume levels and
displaying bargraphs see
CREATE_LEVEL and SEND_LEVEL . The two levels associated with each port of the
NXC-VOL4 Control Card are listed in the table below:
CREATE_LEVEL
This keyword creates an association between a specified level of a device and a variable that will contain the
value of the level.
This can only appear in the DEFINE_START section of the program.
CREATE_LEVEL DEV, Level, Value
Parameters:

DEV: The device from which to read the level.

Level: The level of the device to read.

Value: Variable in which to store the level value.

DevLev: A DEVLEV structure.

Value: Variable in which to store the level value CREATE_LEVEL DevLev, Value.
During execution of the program, NetLinx continuously updates the variable to match the level that it
represents.
NXC-VOL4 Channel Assignments (per port)
Port 1
Channel:
Port 2
Channel:
Description
1 1 While channel is on, ramps the volume on audio channels 1 and 2 up (increase).
2 2 While channel is on, ramps the volume on audio channels 1 and 2 down (decrease).
3 3 While channel is on, the volume on audio channels 1 and 2 are muted (lowest
volume); when channel is off, the volume levels are restored to their previous levels.
4 4 While channel is on, ramps the volume on audio channel 1 up (increase).
5 5 While channel is on, ramps the volume on audio channel 1 down (decrease).
6 6 While channel is on, the volume on audio channel 1 is muted (lowest volume); when
channel is off, the volume level is restored.
7 7 While channel is on, ramps the volume for audio channel 2 up (increase).
8 8 While channel is on, ramps the volume for audio channel 2 down (decrease).
9 9 While channel is on, volume for audio channel 2 is muted (lowest volume); when
channel is off, the volume level is restored.
NXC-VOL4 Levels
Port 1 Port 2
Level Description Level Description
1 Output #1 1 Output #3
2 Output #2 2 Output #4