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±
0.01or 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).
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