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Any or all readings can also be “broadcast” to other controllers on the communications
loop. For example, the Outdoor Air Temperature is broadcast on channel #2 by any unit
that happens to have the sensor attached. If none of the standard package units have the
outdoor air sensor attached, you could attach it to the GPCPlus and select it for broadcast
on channel #2. All other controllers would “hear” the broadcast and use it in their normal
operations. On the other hand, if you are measuring something like return air humidity,
do NOT select channel #2 to broadcast it on, since all the package unit controls are
expecting the outdoor air temperature. If no package controllers exist on your system
then you are free to use any available global channel for broadcast. There are 32 possible
global analog channels and 16 possible global binary channels.
Select global analogs to broadcast readings and global binary channels to broadcast
contact closure (on/off) information.
If you select one of the unassigned channels for broadcast, it is assumed that you have
other GPCPlus units installed that expect to receive information on those channels since
the standard package code does not listen for broadcasts on unassigned channels.
CAUTION: If you elect to broadcast a reading from the GPCPlus to all
other controllers on your installation, be sure to check the
HELP screen to identify which Global Channels have
already been assigned.
Each input also provides high and low alarm limits if the user requires out of range
values to notify service personnel. The alarm limits can be widened at night and they can
also be forced to be out of limits for a user defined amount of time before an alarm
occurs. This prevents false alarms if the reading temporarily exceeds the limit but then
recovers and stays within the limits the remainder of the time.
All readings are user scalable. That means you can display values with ± 1, ± 0.1, ± 0.1±
0.01 or higher resolutions. Just keep in mind that the maximum value that can be sent
from the controller is ±30,000 so if you have scaled your reading to ± 0.001 then the
maximum value you can send is ± 30 with the 3 additional decimal values (30.000).