History: Below is a listing of the Revisions and Changes made to this UFGS.
| KEY | PREPARING ACTIVITY (PA) | A Army | N Navy | F Air Force | S NASA [ARCHIVED] |
|---|---|---|---|---|---|
| ACTION | N New | R Revision | C Change | D Deletion |
| Release | PA | Date | Action | Change # | Nature of Change or Revision |
|---|---|---|---|---|---|
| Feb-2020 | A | Feb-2019 | C | 1 | Incorporated changes to accommodate new requirements for an exception to the use of open protocols within specific system types when certain criteria are met. |
| Feb-2019 | A | Feb-2019 | R | Complete review and update. | |
| Feb-2019 | A | Feb-2019 | R | Complete review and update. | |
| Nov-2015 | A | Nov-2015 | N | Superseding UFGS 23 09 23 LONWORKS DIRECT DIGITAL CONTROL FOR HVAC AND OTHER BUILDING CONTROL SYSTEMS and UFGS 23 09 23.13 20 BACnet DIRECT DIGITAL CONTROL SYSTEMS FOR HVAC |
