Оценок - 4, средний балл: 4
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Фрагмент инструкции
For detailed information on the cards, refer to the NetLinx CardFrame, Control Cards, and NetModules Instruction Manual found on-line at NXC-VOL4 Volume Control Card The NXC-VOL4 Volume Control Card provides four discrete volume control channels with LED feedback. The volume control channels can be programmed for mono or stereo operation, and balanced or unbalanced audio connections. It supports programmable audio levels, audio mute, variable ramp speeds and preset levels. Use the on-board jumpers to set the gain/attenuation (Unity, Pro level (+4dBu) to Consumer level (-10dBu) conversion, or Consumer level to Pro level on each channel). I/O Jumpers (CH1-CH4) FIG. 1 NXC-VOL4 Volume Control card Specifications: NXC-VOL4 Specifications Power Requirements 197 mA @ 12 VDC Volume 1-4 Four volume channels Status 1-4 (3 LEDs per channel) Yellow LED shows level-up/down activity. Red LED shows mute mode: • LED 1: Channel 1 RAISE (yellow) • LED 2: Channel 1 LOWER (yellow) • LED 3: Channel 1 MUTE (red) • LED 4: Channel 2 RAISE (yellow) • LED 5: Channel 2 LOWER (yellow) • LED 6: Channel 2 MUTE (red) • LED 7: Channel 3 RAISE (yellow) • LED 8: Channel 3 LOWER (yellow) • LED 9: Channel 3 MUTE (red) • LED 10: Channel 4 RAISE (yellow) • LED 11: Channel 4 LOWER (yellow) • LED 12: Channel 4 MUTE (red) Gain jumpers 1-4 • Unity Maximum Input Level: +10dBm • Pro level to Consumer level conversion (attenuation of +4dBu IN to -10dBu OUT) Maximum Input Level: +10dBm • Consumer level to Pro level conversion (gain of -10dBu IN to +4dBu OUT) Maximum Input Level: +6dBm Connections/wiring Two 10-pin 3.5 mm captive-screw terminals Audio Specifications • Frequency response of 15 Hz - 25 KHz • THD less than.005% at nominal output level • S/N ratio greater than 100 dB (IHF A) • Crosstalk less than 80 dB • Logarithmic attenuation range of 95 dB Models • NXC-VOL4 Volume Card • NXM-VOL4 Volume NetModule Pinouts, Signals, and Functions: NXC-VOL4 Connections/Wiring: The NXC-VOL4 card contains four audio volume control channels. Each line- level channel is isolated from system ground and can be configured for balanced or unbalanced line operation. It supports programmable audio levels, audio mute, variable ramp speeds, and preset levels. Each audio channel's input to output gain ratio is adjustable via the on-board jumpers shown below. NXC VOL4 Pinouts, Signals, and Functions Pin Signal Balanced Function Unbalanced Function Channel 1 1 GND Audio GND Audio GND 2 Input 1+ Audio IN Audio IN 3 Input 1-Audio IN Audio GND 4 Output 1+ Audio OUT Audio OUT 5 Output 1-Audio OUT no connection Channel 2 6 GND Audio GND Audio GND 7 Input 2+ Audio IN Audio IN 8 Input 2-Audio IN Audio GND 9 Output 2+ Audio OUT Audio OUT 10 Output 2-Audio OUT no connection Channel 3 11 GND Audio GND Audio GND 12 Input 3+ Audio IN Audio IN 13 Input 3-Audio IN Audio GND 14 Output 3+ Audio OUT Audio OUT 15 Output 3-Audio OUT no connection Channel 4 16 GND Audio GND Audio GND 17 Input 4+ Audio IN Audio IN 18 Input 4-Audio IN Audio GND 19 Output 4+ Audio OUT Audio OUT 20 Output 4-Audio OUT no connection (jumper) (jumper) (jumper) (jumper) Unity (jumper not installed) Gain (-10 dB Input level/+4 dB Output level setting on pins 1 and 2) Attenuate (+4 dB Input level/-10 dB Output level setting on pins 2 and 3) FIG. 2 NXC-VOL4 Volume Control card NXC-VOL4 Channel Assignments: The NXC- VOL4 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 channels, which are sent to and from the card. 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, 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), and when channel is turned 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), and when channel is turned 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), and when channel is turned off the volume level is restored. Ramping a volume channel while the mute channel is on will not automatically turn off the mute channel but the ramping will still occur, and the volume change will be noticed when the mute channel is turned off. For setting ramp rates and presets, refer to the Send_Commands. For reading current volume levels and displaying bargraphs see CREATE_LEVEL and SEND_LEVEL programming instructi...