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C1528M-F (6/05) 33
LOCAL AUXILIARIES
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.
96 x 16 System Auxiliary Capacity
Connecting Relay Contacts – AUX 1 and 2
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
O
PERATIN
G
V
O
LTA
G
E
O
F THE EXTERNAL DEVI
C
E
.
= CURRENT LIMITING RESISTOR.
= VOLTAGE OF THE EXTERNAL POWER SOURCE
(
MUST NOT EXCEED VOLTAGE RATING FOR TH
E
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
+VP
S
-VPS
FORMULAS FOR R VALUE
S
R
(
OHMS
)
= VPS-
V
I
P (WATTS) = (I ) X R
EXTERNAL
DEVI
CE
-VP
S
+VP
S
R
C
O
N
TR
O
L