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Pelco Manual C523M-H (6/05) 15
7 CONNECT AUXILIARIES
The SCU provides three auxiliary (AUX) outputs for controlling VCRs and other devices.
These outputs can be activated directly from a keyboard by using the F1, F2, and F3 func-
tion keys, or they can be activated by an alarm (determined by programming). Both relay
contacts and TTL outputs are used.
a. AUX 1 is a dry contact relay output. Refer to Figure 15 for wiring details. Terminal
connections are provided for both normally open (N.O.) and normally closed (N.C.)
contacts. Do not exceed the voltage and current ratings for the relay contacts. You will
need to provide an external power source to operate your device. In most cases you
will also need an external current limiting resistor. The formula for calculating the resis-
tor value is given in Figure 15.
b. AUX 2 and 3 are TTL open collector outputs. These outputs provide a path to ground
to control the low voltage trigger inputs on many devices. They can control higher volt-
age control inputs via isolation relays. Refer to Figure 16 for wiring details. Do not ex-
ceed the voltage and current ratings for the TTL outputs. An external pull-up resistor is
usually necessary. The formula for calculating the resistor value is given in Figure 16.
Figure 15. Wiring the AUX 1 (Relay) Output
VIDEO INPUTS
1 3 5 7 9 1 13 15
2 4 6 8 10 12 14 16
VIDEO OUTPUTS
1
2
3
4
LOCAL
KEYBOARD
00048
PIN 1
12-PIN PLUG-IN
CONNECTOR
CONTROL
OUTPUTS
12-PIN TERMINAL STRIP
ON REAR OF SCU
NOT USED
I
o
= OPERATING CURRENT OF THE EXTERNAL DEVICE.
V
o
= RATED OPERATING VOLTAGE OF THE EXTERNAL DEVICE.
R = CURRENT LIMITING RESISTOR.
+VPS = VOLTAGE OF THE EXTERNAL POWER SOURCE.
-VPS = NEGATIVE, COMMON OR GROUND TERMINAL OF EXTERNAL
POWER SOURCE.
NOTE: I
o
MUST NOT EXCEED
FI CURRENT RATING. +VPS
MUST NOT EXCEED FI VOLTAGE
RATING FOR THE ASSOCIATED
FI CURRENT. VPS CAN BE AC OR DC.
FORMULAS FOR R VALUES
R (OHMS) = VPS - Vo
I
o
P (WATTS) = (I
o)
2
X R
*WIRING FOR NORMALLY OPEN TYPE CONTACTS SHOWN. FOR
NORMALLY CLOSED TYPE CONTACT, MOVE WIRE FROM
THE NO TERMINAL TO THE NC TERMINAL.
EXTERNAL
DEVICE
CURRENT VOLTAGE
1 A 30 VDC
0.3 A 11 VDC
0.5 A 125 VAC
R
+VPS -VPS
I
o
V
o
F1 RELAY
CONTACT RATINGS