==== Door latch control ====

This driver manages a pulse-operated latch, such as the Southco R4-EM or similar.

== Features ==
  * Monitor latch and door status
  * Control latch 100 ms pulse
  * Detects latch and door tamper
  * Re-trigger latch if door is opened and latch is reset
  * Monitor and report total time door was opened
  * Optionally report if door is open longer than allowed

The driver expects the following connections:
^ Type ^ Signal ^ Purpose ^ Status ^
| Input | Door status | Monitor the status of the door | Closed circuit = Door closed |
| Input | Latch status | Monitor the status of the latch | Closed circuit = Latch closed |
| Output | Latch trigger | Triggers the latch to open | 100ms positive pulse |

Note that the output pulse voltage is the same as the system supply voltage.

The Latch should be supplied directly from the power supply.
DO NOT supply the latch through the ezeio.

The following events are detected and logged/reported
^ Condition ^ Reported status ^
| Latch triggered & door opened | "Door opened" |
| Door closed & latch reset | "Door closed. Was open #s" |
| Latch triggered, door not opened | "Door failed to open" |
| Latch reset while door remain open | "Latch tamper" |
| Latch or door opened without trigger | "Door forced open" |
| Door open longer than allowed | "Door open too long #s" |

{{:ezeio2:userinterface:configuration:devices:latch:southco_latch.png?direct&600|}}


If no destination list is selected, alerts are just logged.