2-5
cables are available. An extra set of connector pins is included in case it is necessary to
cut the cable for any reason.
Plug the Molex connector onto the CCD board in the Digital Soundhead before plugging
the male DB25connector onto the DA20.
Three ferrite blocks are shipped with the Cat. No.700. One of these should be installed
near each end of the video cable. If the cable is installed in conduit then place the blocks
at the DA20 end. If the cable is not in conduit then installation of these ferrite blocks is
essential to prevent excessive RF energy radiation, and should be placed near each end of
the cable.
Plug the Molex connector onto the CCD board in the Digital
Soundhead before plugging the male DB25connector onto the DA20.
2.3
Making a Custom Video Cable
The following information is included for use when a cable is being made up on site. The
cable should be Belden Datalene 8164, which contains four shielded twisted pairs of
computer-grade cable with the shields isolated from each other plus a 100% coverage
overall shield. Using other types of cable may result in unsatisfactory operation. The
overall shield is necessary to prevent RF interference signals from radiating from the
video cable, causing possible complaints and violating government EMI standards. A
metal shell MUST be used on the D-connector and the overall shield MUST be grounded
to the connector shell to ensure proper operation and compliance with EMI regulations.
Wiring table for DB25 end of video cable
25 pin
D-connector
pin no.
Molex
pin no.
Wire
Color
Signal
name
1
n.c.
2
n.c.
3
n.c.
4
7
Blue
TTC
5
9
Shield
TC GND
6
8
Black
FTC
7
1 0
White
TSC
8
1 1
Shield
SC GND
9
1 2
Black
FSC
1 0
n.c.
1 1
n.c.
1 2
n.c.
1 3
n.c.
1 4
1
Black
Video 0
1 5
2
Shield
GND
1 6
6
Red
+15V
1 7
3
Black
Video 1
1 8
5
Shield
GND
1 9
4
Green
–15V
20 through 25
n.c.
