HBZMXSIB/10/16SD-PR-1
Page 20
Vext Input
The Vext input (camera switch input) is for connection from the VCR to your
multiplexer. The VCR uses it to tell the multiplexer each time it has recorded an
image. The multiplexer then transmits the next image on its VCR record output
(video-in on the VCR). By this mechanism the VCR can control the multiplexers
recording speed.
Connect the Vext input (pin 24) and one of the ground pins to your VCR.
This facility is often referred to as a camera switch output, or similar, (see your VCR
instructions.) It is especially useful on VCRs with dual recording speeds (alarm and
normal) because the multiplexer will automatically follow.
Note
Some VCRs do not transmit a Vext in 3 hour mode. To ensure that this does not
affect you, set the recording speeds for alarms and normal operation to be the
same in the RECORD menu.
The Vext input accepts:
•
TTL, field-synchronised, negative going pulse, duration 2-5 ms
•
HIGH level, +4.5V to +5.5V
•
LOW level, 0V
The multiplexer can be set to trigger off the negative or positive going edge (Vext
Pulse Edge in the Record menu). There is also an option to allow compatibility with
some older types of VCR (VCR type A and type B compatibility, also in the Record
menu).
Check this against your VCR specification before using it.
Power
The multiplexer is supplied with a 12V DC class 2 output, auto-ranging: 110/230V AC
±
10%, 50Hz, input, external power supply. Its maximum power consumption is 20W.
Do not use any other power supply.
Do not connect the power until you have read the section Power-Up and Tests.
Following the wiring instructions on the label attached to the mains lead, attach a
suitable three pin plug.
Note
The manufacturer accepts no responsibility for any damage caused by the use of
any other power supply.
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