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PAGE 20 of 68 VX2200 TECHNICAL MANUAL VER1.5

VX123 VIDEO SWITCHING PCB

The VX123 is used on multiple door video systems to switch the

video from a single door to the bus. Each PCB can control up to

four video panels. Multiple PCB’s can be used to expand the

system. A green LED indicates when a panel is connected to the

bus.

CONNECTION FUNCTION

GND 0V

+12 12Vdc from PSU to power the PCB

+20 20Vdc switched to the relevant door when triggered

V1 + Sync video signal switched to relevant door when triggered

V2 - Sync video signal switched to relevant door when triggered

SL Trigger input to activate a channel (Switched 0V)

4 WAY ISOLATION PCB (2204N)

The 2204N will protect against shorts or faults on all connections to an apartment. Plug in connections are

used for easy maintenance. The 2204N can also be connected as a bus in a prewired cabinet and is

addressed using a 6 way dip-switch bank. For video systems there is an additional video isolation card (316I

for non-coax or 894I for coax) which piggy backs this board and includes all the additional connections for

video. There are 10 LED’s on each card which can be used to identify when a channel is in use (Green

channel LED on) and to indicate a variety of faults such as shorts on +12V out, short on bus and S1

permanently active.

 Six way connectors – Main bus in/out

 Five way connectors – Four outputs to

apartments.

Connection

Function

Bus connection

12V

+12Vdc

Door open LED (Switched 12V)

Spare service button on telephone

(Switched 0V)

LED

Function

Bus fault output 1

Bus fault output 2

D14

Bus fault output 3

D19

Bus fault output 4

Output 1 active

Output 2 active

Output 3 active

Output 4 active

D21

S1 service switch active

12V out fault on one of the outputs

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