Section 5 – Gateways
5-3
Commandable Output Point Interface Devices (COPIDs)
The Commandable Output Point Interface Device:
•
Is a listening-type device and is not interrogated by the control unit.
•
Awaits a command from the control unit to operate its output relays, A and B, in response to a
change in a function being monitored.
•
Provides Form C dry contacts on the relays.
•
Can be assigned to the same address as another COPID on the gateway trunk.
•
Can be assigned to the same point as the sensor that it will follow, and its relay will then operate
when the point alarms, and will remain activated until the point restores.
•
Is not supervised and cannot be used where point supervision is required.
PID Gateway Physical Description
The gateway consists of a printed wiring board that is installed in a separately ordered housing unit.
The following are important items on the board (see
Figure 5-1)
:
Part Purpose
Terminal Strip TB1 Used for making connections to the RS-485 bus.
Terminal Strip TB2 Used for connecting gateway quad Trunk 1A.
Terminal Strip TB3 Used for connecting gateway Trunk 1B. This second trunk is used in
instances where there would ordinarily be one long cable run that would
result in an excessive voltage drop on the power lines. By locating the
gateway near the center of this run and using two gateway trunks, the
voltage drop of each trunk can be kept to an acceptable level.
Jumpers E10 (for TB2)
and E11 (for TB3)
Used to accommodate an increase current level, with a rating greater than
0.5A, when the gateway is connected to a separate power supply, Inserting
the jumpers serves to connect a larger internal fuse (1.6A per trunk).
Otherwise, remove jumpers if the gateway is not connected to a separate
power supply.
Jumpers E2 through E9 Used for setting the gateway communication address on the RS-485 bus.
Terminating jumper E1 Insert only if the gateway is located at one end of the RS-485 bus.
TXD and RXD LEDs
Indicates the gateway communication status as follows:
•
TXD LED - flashing when the gateway is transmitting
•
RXD LED - flashing when the gateway is receiving.
Tamper Space is provided for adding a tamper switch, which must be ordered
separately as a 248116 Tamper Kit.
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