Section 5 – Gateways
5-5
Installing the PID Gateway
Installation Guidelines
The following guidelines should be considered when planning the installation:
Function Guideline
Minimizing Voltage
Drop
Where an appreciable number of system-powered devices are involved,
consider using a dual run of the quad trunk cable, with one cable run
connected to the Trunk 1A terminal strip and the other run connected to
the Trunk 1B terminal strip (see
Figure 5-1
). If a dual cable run is being
used, try to locate the gateway so that the sensor load will be evenly
distributed between the two runs.
Maximum RS-485
Length from Control
Unit to Gateway
4000 feet. This distance may be less to comply with the minimum
voltage to the PID gateway.
Maximum Cable
Length from PID to
Sensor
Must not exceed 100 feet.
Total Length of
Gateway Trunk Cable
Must not exceed 1000 feet. This length may be less to comply with
minimum voltage to farthest PID sensor. If using both gateway trunks,
limit applies to the sum of both runs.
Minimum Voltage to
PID Gateway
12.1VDC with a fully charged battery and AC power applied to the
control unit, or to an external power supply, if used.
Minimum Voltage to
Farthest PID Sensor
12.1VDC with a fully charged battery and AC power applied to the
control unit, or to an external power supply, if used.
Maximum Current
Draw from PID for
System Powered
Sensor
85mA.
Maximum Current
Draw from Gateway
Trunk
The current on each gateway trunk must not exceed:
•
0.5A if the gateway is receiving power from the control unit power
supply (remove jumpers E10 and E11)
•
1.6A if gateway is receiving power from 472372 Power Supply
module (leave jumpers E10 and E11 on)
Gateway Log Form
Complete the Gateway Log Form shown later in this section. When the
form has been completed, make a duplicate copy. Store one copy in the
control unit and file the other copy in the office.
Location
Considerations
Make sure the PID gateway is:
•
Protected from physical damage.
•
Not mounted on temporary walls or partitions.
•
Mounted in an area free from excessive vibrations, corrosive
atmospheres, high temperatures.
•
Mounted within the protected area.
•
Never exposed to the outside elements.
PID Housing Unit
The Housing provides combination cable entry ports with built-in strain
relief and a snap lock-hinged cover with a writing surface on its exterior
for the PID address. It can be mounted on walls, ceilings, and building
structures in any position. The PID modules snap into the housing unit
and are held in place with a locking catch. Modules are easily removed
by depressing the locking catch.
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