AR2700
User’s Manual
13
3.1.6
Alarm Outputs Q1 and Q2 (Brown, Black)
The Brown wire is the Alarm Output 1 (Q1). The Black wire is Alarm Output 2 (Q2).
See Alarm Output Operation (section 6) for operation options and details.
The Alarm Output is an open collector PNP transistor switch to the Ground for Power
(Blue). When the Alarm Output is not active, its output will be high impedance and no
current will flow through it. When the Alarm Output is active (On) it can source up to
500mA of current.
The voltage on the Alarm wire must not exceed the limits of the Power Supply
connection voltages (Red and Blue wires), or excessive current may flow into the
sensor and cause damage. A load resistor of > 150 Ohms/6 W (max. operating voltage
of 30 V; max. load current of 0.2 A) must be switched against Ground (Blue) at the
switching output. A
typical
resistance is 1 kOhm against ground.
Figure 5 Wiring diagram for Alarm Output
3.1.7
Trigger Input and Output (Violet)
The Violet wire can be used as a trigger signal input OR output. The trigger function
can be set with the parameters TI (Trigger Input - See Section 8.7) and TO (Trigger
Output
– See Section 8.8)
Voltage levels for the trigger signals
LOW
0-1.5V
HIGH
3-30V
Threshold
2.25V
Hysteresis
0.1V
Note: The violet wire can only be used as
EITHER
a trigger signal input
OR
output
at any one time. This is determined by the value of the y parameter of the TI
command (See section 8.7)
