Wired Door & Window Alarm Contacts Frequently Asked Questions

What Is a Security Door Contact?
When attached to a door, a security contact will let the system know when the door has been opened. Both wireless and wired door contacts are available.
Added:

What is Zone-Doubling on a Honeywell VISTA System?
Zone-doubling is a method of using different value resistors on zones 2 - 8 to allow 7 hardwired zone inputs to behave like 14 separate zones. This is particularly helpful if you need more than 8 hardwired zones, but fewer than 16. Zone 2, doubled, becomes 2 and 10, zone 3 becomes 3 and 11, and so on.
Added:

Why Isn't My Wired Door Sensor Working?
A wired door sensor may not be showing the correct status due to programming or wiring issues. Read on to find out how to troubleshoot wired door sensors.
Added:

What is the Difference Between a 5816WMWH and a 5816?
The difference between a 5816WMWH and 5816 is that the 5816WMWH includes a magnet whereas the 5816 does not. The magnet can be used with the internal reed switch to monitor status of a door or window.
Added:

Can I Install a Window Contact on a Honeywell Alarm?
A window contact can be installed on any Honeywell panel. The optimal window sensor depends on the model of the panel and the applications that are needed.
Added:

What Do Normally Closed and Normally Open Mean?
"Normal" is the normal state of an opening, such as a door. Normally open/closed refers to the state of a contact connected to a door in its normal position.
Added:

What's the wire length limit on a Honeywell VISTA's polling loop?
There are strict limits on polling loop distance, based on current drawn, and wire gauge used. Learn the rules and limits for wiring the polling loop.
Added:

How Do I Connect a 4193SN to a VISTA-128BPT, 250BPT or VISTA-50?
The 4193SN connects to the Vista-128BPT, 250BPT, or 50 through the polling loop on terminals 24 (Positive) and 25 (Negative). Learn how to wire the 4193SN.
Added:

How Do I Add a 4193SN to My VISTA-128BPT, 250BPT or VISTA-50?
The 4193SN is an expansion device which allows users to add conventional devices to the polling loop by programming its serial number into the zone(s). Read on.
Added:

How Do I Program a 4193SN to a VISTA-128BPT, 250BPT, or VISTA-50?
The Vista-128BPT and similar panels use a polling loop for wired expansion. In zone programming, use input type to identify zones. Learn to program a 4193SN.
Added: