User's Manual

Versus Technology, Inc.
Hardware and Wiring Installation Guide 29
When the collector wiring and isolation have been verified, and the cable connection between the
concentrator and the collector has been tested and found correct, the next step is to apply power to
the collector and check the sensor connections for the correct voltages.
► 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.
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.)
When the voltmeter is applied to a sensor pair, a slight drop in voltage can be observed when
the sensor is receiving a transmitting ID badge.
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 Connecting Collectors and Concentrators
There are two parallel RJ receptacles on each collector. This allows collectors to be chained
together from the concentrator to the last collector in the chain.
With each Collector, Versus provides a silver satin cable with an RJ-12 modular jack (6 wire) to
daisy chain Collectors and connect the last Collector to the Concentrator. If longer distance is
needed between Collectors, or if Collectors are in proximity to high electrical interference, CAT 5
cable is needed.