User's Manual

22 Versus Technology, Inc.
? To test sensor voltage
Once power has been applied to the collector, a voltmeter check should be made of the sensors on
the punch-down block to verify that they are connected correctly.
1. Set the voltmeter or multimeter to a 20-volt range.
2. Apply the probes to each sensor connection on the punch-down block.
When voltmeter is applied to a sensor pair, a slight drop in voltage can be observed when the
sensor is receiving a transmitting ID badge. This can be used to identify sensors in lieu of
complete system operation.
3. Check RF interference by switching the meter to the AC scale and reading the voltage. With
no badge transmitting over the sensor there should be < 0.1 VAC on a sensor pair.
Caution!
A shorted sensor pair will not cause immediate damage to the collector. However, if allowed
to remain, some heating of collector components will occur, which is undesirable. If shorted
pairs are found in the sensor voltage test, remove the collector power and resolve the short
as soon as possible. If the system must be powered with the short unresolved, remove the
punch-down block bridging clips to disable the disruptive sensor until the wiring can be
repaired.
4.5.4 Collector Network Wiring Connections
4.5.4.1 Concentrator End Connections
The 2-pair collector network connects to the concentrator unit using a modular connection with an RJ-
12 modular jack (6 wire). This provides a means to easily disconnect the collector network for testing
of the 2-pair wires or for service of the collector unit.
4.5.4.2 Collector End Connections
The 2-pair collector network connects to the collector module via a modular connector with an RJ-12
modular jack (6 wire). A modular-to-modular jumper is then used from one collector unit to the next
collector unit. This provides a means to easily disconnect the collector unit for testing of the 2-pair
wires or for service of the collector unit.
If the reading is:
For: (Sensor type)
Then:
Approximately 16
volts
IR The sensor is wired correctly.
Approximately 18
volts
RF The sensor is wired correctly.
<14 volts IR and RF
There is radio frequency or electromagnetic
interference.
Approximately 20
volts
IR and RF
There is no sensor connected to this pair or the
wiring to the sensor is open.
Very low or zero IR and RF
The sensor pair is shorted. (The 25th pair on the
punch-down block is unused and will read zero
volts.)