DPX16: Instructions for Basic Operation and Installation
Page 25
In some installations, the alarm output is used to activate or deactivate high voltage and/or high current
circuitry (110 VAC lights, siren, etc. ) which cannot be controlled directly by the DPX16. In other cases, the
alarm output needs to control multiple circuits of different types (mixed DC and AC equipment) or the
“sense” of the control logic is different (alarm needs to be “high” instead of “low”).
The easiest method to address the above cases is to use a relay that has the number of contacts and
rating sufficient for the alarm output. Shown below are two methods to control a high current or high
voltage device using a relay with a single, normally open contact. An internal, current limiting resistor for
the pin 9 +5V supply will limit the usable relay current to something less than 10 mA (depending on the coil
impedance). If a higher voltage, or higher current relay is used, an external supply is required. Under
these conditions the open circuit voltage (no alarm) on pin 9 must not exceed 30 Vdc and the closed
circuit current (alarm active) into pin 9 must be less than 50 mA.
The breakout adapter board is numbered compatibly with the DB-15 connector so the following table is
applicable to either. Note: Pin 16 is only present on the Breakout Adapter and is connected to
chassis ground.
High Current/Voltage Alarm Output
To be used when output current exceeds 50 mA
or when, non-alarm voltage exceeds 30 Vdc.
Voltage/Current limited by contacts of the
relay being used.
Less than 10 mA
5 Vdc Relay
CLOSED = Alarm activated
OPEN = No alarm
Vout Relay
CLOSED = Alarm activated
OPEN = No alarm
CLOSED = No alarm
OPEN = Alarm activated
1
16
1
16
Vout
-
+
+30 Vdc, 50 mA max.
ALARM CONNECTOR PINS (1-9)
1 Alarm 1
9
Alarm Out (< 50 mA)
2 Alarm 2
10
Freeze/Master Enable
3 Alarm 3
11
Alarm 9
4 Alarm 4
12
Camera Switch Input
5 Alarm 5
13
+5V ( < 10 mA)
6 Alarm 6
14
(reserved for future use)
7 Alarm 7
15
Signal ground (< 10 mA)
8 Alarm 8
16
Chassis ground
ALARM CONNECTOR PINS (9-16)
1 Alarm 9
9
Alarm Out (< 50 mA)
2 Alarm 10
10
Freeze/Master Enable
3 Alarm 11
11
Not Used
4 Alarm 12
12
Camera Switch Input
5 Alarm 13
13
+5V ( < 10 mA)
6 Alarm 14
14
(reserved for future use)
7 Alarm 15
15
Signal ground (< 10 mA)
8 Alarm 16
16
Chassis ground
