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JVC SW-D8000U Instruction Manual
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SW-D8000U, 16CH. COLOR VIDEO MULTIPLEXERJVC PROFESSIONAL, IMAGING PRODUCTS 172.9 VEXT INPUTThe VEXT input (camera switch input) is for connecting from the VCR to your multiplexer. The VCRuses it to tell the multiplexer each time it has recorded an image. The multiplexer then transmits thenext image on its VCR record output (VIDEO IN on the VCR). This way the VCR controls themultiplexer’s recording speed. Connect the VEXT input (Pin 24) and one of the grounds pins to yourVCR.This facility is often referred to as a camera switch output, Rec trigger output, or similar, (see yourVCR instructions). It is especially useful on VCRs with dual recording speeds (alarm and normal)because the multiplexer will automatically follow.NOTE: Some time-lapse VCR’s do not transmit a VEXT signal in real time mode (2 hour NTSC).In these cases, if you are using the VEXT input, select the same recording speeds inboth the Alarm Record Speed and Normal Record Speed menu settings in the RECORDOPTION in the MAIN MENU.The VEXT input accepts:q TTL, field synchronized, negative going pulse, duration 2-5msq HIGH level, +4.5V to +5.5Vq LOW level, 0VThe multiplexer can be set to trigger off the negative or positive going edge (VEXT Pulse Edge in theRECORD menu).NOTE: On power up, the auto-detection circuit will wait about 15 seconds to check if the VCRstarts to output a switch pulse. The period of 15 seconds is approximately the periodbetween switch pulses when the VCR is running in 960-hour mode. During this brieftime the multiplexer will not switch cameras at all unless a switch pulse is detected. Ifthe switch pulse ceases, the multiplexer will also take about 15 seconds to determinethat it has in fact stopped and not just changed to 960-hour mode.2.10 POWERThe multiplexer is supplied with a DC 12V class 2 output; AC 240 or 110V ±10%, 50 or 60Hz, input,external power supply. Its maximum power consumption is 40W.DO NOT use any other power supply.DO NOT connect the power until you have read the section Power Up and Tests in Section 4.1.NOTE: The manufacturer accepts no responsibility for any damage caused by the use of anyother power supply. |
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