Adding McQuay proxy points

The figure below shows the first New dialog when adding a proxy point from the McQuay Point Manager.

Figure 9. New McQuay proxy point (initial) dialog

As shown in Figure 9, click the Type to Add drop-down control to select from these types:

McQuay AI — use for any numeric read-only data item, or for monitor-only access of any read-write numeric data item.
McQuay AO — use for any numeric read-write data item that you wish to monitor and control from Niagara, meaning to invoke action or link to input.
McQuay BI — use for any Boolean (two-state) read-only data item, or for monitor-only access of any read-write Boolean data item.
McQuay BO — use for any Boolean (two-state) read-write data item that you wish to monitor and control from Niagara, meaning to invoke action or link to input.
McQuay Enum — for monitor-only access to any one of the following McQuay data items:
- Current Alarm
- Unit Status
- Compressor Alarm 1
- Compressor Alarm 2
- Compressor Alarm 3
- Compressor Alarm 4

The figure below shows the second New dialog when adding a New proxy point.

A similar dialog appears if using the Edit feature for an existing McQuay proxy point.

Figure 10. New proxy point (second) dialog

Figure 10 shows the various fields available and the example default (new point) values. Change values as needed, using the guidelines below.

Name

Type in to replace default “McQuayTypeN” name, where each name must be unique in the parent container for the proxy point.
Type

Already set, and if in the Edit dialog, read-only (cannot change if proxy point already created).
Register Hex

Enter the documented register address for the data item, using hexadecimal notation.

For example, if “Dew Point Temperature” is listed at address “$042F”, enter 042F
Data Len Registers

Enter the documented number of registers for the data item, typically either 1 (default) or 2.

For example, if “Operating Hours” address is listed as “$08C7 - $08C8”, enter 2
Enum Type

(Unavailable unless a McQuay Enum point) Select from the available enum types.
In this case, do not enter (disregard) values for Register Hex and Data Len Registers—these values are automatically resolved upon point creation, overwriting any entered values.
Poll Frequency

Accept the default “Normal” poll frequency, or else change to “Slow” or “Fast”.
Enabled

Accept the default “true” (if set to “false” point status is set to disabled, and the item is not polled).
Device Facets

Accept defaults—usage is not applicable in McQuay driver.
Facets

Edit as needed for proper unit display and decimal handling of the selected data item.
Tuning Policy Name

Accept the standard “Default Policy”, or if additional tuning policies have been added to the McQuayNetwork, select another tuning policy if needed.
Conversion

As needed, change from the “Default” conversion for proper handling of the selected data item.

Typically, this applies to any:
- AI or AO point where the McQuay raw data value, typically integer 0-255, requires scaling.
  
  In this case, select Linear, then enter a value in Scale (replacing the default 1) as documented by McQuay. Usage of Offset (from default 0 value) is optional.
- BI or BO point where the McQuay raw data value, typically integer 0 or 1, requires “polarity reversal”, meaning that 0 should be evaluated as “true” (On) and 1 should be evaluated as “false” (Off). In this case, select Reverse Polarity.