User's Manual

Versus Technology, Inc.
28 Versus Information System
4.5.2 Terminating the Last Collector
The Collectors on the Versus Information System are connected by wires run from unit to unit in a
daisy-chain fashion and carry high speed digital data to the Concentrators. It is critical that the
electrical energy running through the Collector wires is absorbed at the end and does not “bounce
back” down the wire and cause interference with other data coming through. To absorb the energy,
the wire must be ended with a resistor on the last Collector in the chain, terminating the
transmission of data.
Two models of the Collector exist, each with a different method of termination. The old style
collectors are equipped with a switch that must be turned to the Terminated position on the last
Collector in the daisy-chain, as shown below.
Terminated Unterminated
It is very important that the collectors which are NOT at the end of the line have this switch set to
the UNTERMINATED position, and that the collector which is at the end of the line has this
switch set to the TERMINATED position.
The new style Collectors are considered unterminated until a termination shunt is placed in one of
the two jacks on the unit. A termination shunt is shipped with each Collector, but only those at the
end of the daisy-chain will need to be terminated.
4.5.3 Testing Sensor Voltage
Collectors are included with a 24V power supply that must be used for each collector, providing
local operating power. No other power supply is adequate to power collectors. To ensure the
power supplies do not pull out by their own weight, either mount the power strip outlet side up or
use wire ties to hold the power supply in place.
Power supply
may become
disconnected if
power strip is
mounted
sideways.
Use wire ties to hold the
power supply in place.
Termination Shunt
Unterminated Collector Terminated Collector