Installation guide

BBV_1-2-1 _Protocol_converter_manual_V41_November_2013 Page 30 / 40
PHOTOSCAN FIXED SPEED PAN/TILT from BBV and Pelco D/P telemetry only
The following functionality is provided:
Fixed speed Pan/Tilt
Zoom/Focus/Iris
WIPE drives the WI aux output
WASH drives the WA aux output
AUTOPAN drives the A2 output
LIGHTS has not been tested due to faulty receiver.
Photoscan receivers are driven using current loop
telemetry.
The output of the 1-2-1 converter must have a diode
fitted to each output as shown in the diagram on the
left to allow control of the Photoscan units.
It is possible for the receivers to function without the
diode but it is recommended that the diode is fitted to
reduce the reverse voltage on the receiver’s opto
isolator input.
It is possible to connect multiple receivers to each
star output this is not recommended.
NOTES:
1. PLEASE READ THIS CAREFULLY FIRST.
Controlling more than one camera at the same time will cause intermittent telemetry control.
This is because the BBV1-2-1 converter repeats commands to moving cameras. Receivers
with a different address will stop moving until their command is repeated.
Switching SW4/8 ON will disable the command repeats, but could cause control problems
with Photo Scan domes.
2. Ensure that switches SW1/3&4 must be OFF. This disables the RS422 termination. Poor
telemetry control can result if these switches are not off.
3. The 1-2-1 converter does NOT send a power up message when Photoscan protocol is selected
because this will cause the telemetry receivers to move the camera as the protocol does not use
checksums.
SW4
R
B
R
A
T
R
B
T
R
A
G
N
D
Star output
D+
D-
1N4001 or similar diode