CV-A2
6.2. Input-output of HD/VD Signals
In the default setting the camera will accept external HD/VD signals on pin 6 and 7 of the 12 pin
Hirose connector. If external HD/VD is applied, the camera will synchronize to it. If no external
sync signals are applied, the camera will operate with its internal x-tal controlled sync. The
input is TTL level as factory setting. It can be 75 Ohm terminated by the internal switch on the
PK8486A board. SW502-3 for HD and SW502-4 for VD. On for 75 Ohm termination.
To output the internal HD/VD signals on pin 6 and 7 the internal switch SW501-1 and 1-2 on the
PK8486A board should be set ON. The output is TTL level from a 75-Ohm source.
To use this mode:
Set function:
SW 501 on PK8486A to
IN for ext. VD/HD input. (Factory default.)
SW 502 on PK8486A to 75
Ω
for termination of VD/HD.
SW 502 on PK8486A to
TTL for TTL level for VD/HD. (Factory default.)
SW 501 on PK8486A to OUT for internal VD/HD output.
Input:
Ext. VD in or int. VD out on pin 7 on 12-pin connector.
Ext. HD in or int. HD out on pin 6 on 12-pin connector.
Important notes on using this mode
•
External sync system should follow the camera scanning and binning system.
•
In trigger modes there are no continuous VD out, only after each trigger input.
•
With external HD/VD synchronizing in continuous partial scanning modes, a few pixel
jitter can be expected in the first few lines. It can be avoided if a trigger mode is used.
±1 /8 L
9 to 12 L
Ext. VD
Ext. HD
Int. VD
Int. HD
Fig. 12. Ext. HD and ext. VD phase conditions.
48 to 166 CLK
46 ±4 CLK
±４CLK
Ext. H = 18.828 kHz
±
2%
L = 1H = 53.1
µ
s
1 CLK = 27.66 ns
(CLK = 36.15MHz)
Ext. HD
Int. Sync
Int. HD
Fig. 13. Ext. Int. HD timing details.
SW501-1. HD in/out
SW501-2. VD in/out
SW502-3. HD TTL/75
SW502-4. VD TTL/75
Fig. 14. Switch positions for int./ext. sync and termination.
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