Pelco C1528M-F User Manual

C1528M-F (6/05)

33

The CM6800E provides three local auxiliary (AUX) outputs on the rear panel for controlling VCRs, printers, and other devices. These outputs can 
be activated directly from a keyboard by using the F1, F2, and F3 function keys, or they can be activated by an alarm (determined by 
programming). Both relay contacts and TTL outputs are used.

In addition, you can connect up to four REL2064 Relay Interface Units to the CM6800E. Note that since operation of the three internal auxiliary 
relays on the CM6800E will also operate the first three relays on the external unit, the maximum capacity of the system may be limited to 256 
auxiliaries (depending on how you number the external relays). Refer to the Connecting a Single REL2064 Relay Interface Unit section for 
connection instructions.

AUX 1 and 2 are dry contact relay outputs. Terminal connections are provided for both normally open (N.O.) and normally closed (N.C.) contacts. 

Refer to Figure 26 for wiring details. Note that this figure shows the wiring for a normally open contact. For a normally closed contact, move the 
wire from the N.O terminal to the N.C. terminal.

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 resistor value is given in Figure 26. 

Figure 26.  Wiring the AUX 1 and 2 (Relay) Outputs

Main unit:

AUX 1-3

Expansion Unit:

AUX 4-6

=  OPERATING CURRENT OF THE EXTERNAL DEVICE (MUST NOT EXCEED AUX 1 CURRENT RATING.)
=  RATED OPERATING VOLTAGE OF THE EXTERNAL DEVICE.
=  CURRENT LIMITING RESISTOR.
=  VOLTAGE OF THE EXTERNAL POWER SOURCE (MUST NOT EXCEED VOLTAGE RATING FOR THE
    ASSOCIATED CURRENT). VPS CAN BE AC OR DC.
=  NEGATIVE, COMMON OR GROUND TERMINAL OF EXTERNAL POWER SOURCE (AC OR DC).

12-PIN PLUG-IN 
CONNECTOR

AUX 1 RELAY

CONTACT RATINGS

CURRENT @ VOLTAGE

1A
0.3A
0.5A

30 VDC
110 VDC
125 VDC

I
V

V
R
+VPS

-VPS

FORMULAS FOR R VALUES

R (OHMS)    =    VPS-V

I

P (WATTS)    =    (I  )  X R

 

EXTERNAL

DEVICE

-VPS

+VPS

R