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Order a concealed magnetic DPS by default and pick the code by door and frame material: Schlage Electronics 679-05HM for hollow metal door and frame, 679-05WD for a wood door in a metal frame, 679-05 for wood door and wood frame. All three are SPDT, rated 0.3 A at 30 VDC and listed UL10C/CAN-ULC-S104. Go surface mount (7766) only when you cannot bore the door or frame, such as aluminum storefront retrofits or occupied buildings where patching is not an option. Step up to the FSS1 high-security DPS (about $1,010 at NLS) only for server rooms, government or military openings where someone may attack the switch with a magnet. If the door already needs a power transfer hinge, the SDC PTH-4Q-DPS puts the contact in the hinge and saves a bore.

What does a door position switch report, and how is it different from a REX?

A door position switch tells the controller one thing: the door leaf is open or closed. Every FACTS listing describes the same job, detecting "the open or closed status of an opening" and sending it to a control panel, and the same switch types are used on roof hatches and gates. It does not say whether the lock is engaged. A door can sit closed against an unlatched strike and the DPS still reports "closed." That gap is why integrators pair a DPS with a latchbolt monitor or a magnet bond sensor on maglock doors.

A request-to-exit device is the opposite signal: it tells the panel that someone is leaving on purpose, so the open-door event that follows is not logged as a forced door. DPS plus REX is what turns raw door events into usable alarms (forced door, door held open). REX selection has its own decision tree in our guide on how to choose a request-to-exit device; this article stays on the position side.

What to order: one DPS per monitored leaf, from the access control system accessories category.

Concealed vs surface vs high-security: which DPS fits the door and frame?

The mounting decision comes before the part number. Concealed switches mortise into the frame head or jamb with the magnet in the door edge. They are invisible, tamper resistant and the default for new hollow metal openings. Surface switches screw to the face of the frame and door. They are the fallback when the frame is filled, when the door is aluminum with no room to bore, or when the owner forbids drilling. High-security sensors replace the simple reed switch with a sensor array that learns a unique magnetic footprint, so a second magnet held against the frame does not fool them.

Model	Mount	Door / frame material	Contact and rating	Link
Schlage Electronics 679-05HM	Concealed	Hollow metal door and frame	SPDT, 0.3 A at 30 VDC	679-05HM
Schlage Electronics 679-05WD	Concealed	Wood door, metal frame	SPDT, 0.3 A at 30 VDC	679-05WD
Schlage Electronics 679-05	Concealed	Wood door and frame	SPDT, 0.3 A at 30 VDC	Same category
Schlage Electronics 7764	Concealed / flush	Aluminum, wood, hollow metal	SPDT, 0.25 A at 30 VDC	Same category
Schlage Electronics 7766	Surface	Aluminum, wood, hollow metal	SPDT, 0.25 A at 30 VDC	7766
Schlage Electronics FSS1 (194555101661)	Flush, mortised, with conduit	High-security openings	10 to 30 VDC, typically 50 mA	FSS1 flush

The 7764 is the concealed answer when one switch has to cover a mixed building: its listing names aluminum, wood and hollow metal doors in one part. The 7766 is the same rating in a surface body, about $247 at NLS. The FSS1 comes in two bodies, flush mortised (194555101661) for new construction and surface (194555101647) as a replacement for a traditional balanced magnetic reed sensor. Both list a working door gap of 1 to 7 mm, 15 mm of door movement and space for Type 1 and Type 2 modules.

What to order: concealed for new hollow metal, the 7766 surface switch for no-bore retrofits, FSS1 for high-threat rooms.

679-05HM vs 679-05WD vs 679-05: which code for which door?

These three are the most searched DPS codes on our site, and they are the most often mis-ordered. The suffix describes the door and frame pair, not the switch electronics. All three carry identical electrical specs (SPDT, 0.3 A at 30 VDC, UL10C/CAN-ULC-S104) and are priced the same or close: the 679-05HM is about $99 at NLS.

Situation on site	DPS type	Reason
Hollow metal door in hollow metal frame	679-05HM concealed	Listing is for hollow metal doors and frames
Wood door hung in a metal frame	679-05WD concealed	Listing is for wood doors and metal frames
Wood door in a wood frame	679-05 concealed	Listing is for wood doors and frames
Aluminum storefront, mixed materials across the job	7764 concealed or 7766 surface	Both list aluminum, wood and hollow metal doors
Grout-filled frame, no boring allowed	7766 surface	No mortise needed in the frame
Server farm, government or military opening	FSS1 flush or surface	Detects a unique magnetic footprint, tamper response
Exit device door, monitor at the touchbar	PHI DS880 or NDS986 kit	Reed switch mounts in touchbar endcap and frame

Search data shows steady demand for the "679-05WD template" and "679-05HM template." Pull the drilling template from the Schlage Electronics install sheet for the exact part you have in hand and bore to it; a guessed hole diameter in a hollow metal frame is a frame repair, not a re-drill.

What to order: the 679-05HM for all-metal openings or the 679-05WD for wood leaves in steel frames.

What does SPDT mean, and how does a DPS wire to the controller?

SPDT (single pole, double throw) gives you a common terminal plus a normally open and a normally closed contact. That is the practical reason to buy an SPDT switch: you can land the input on whichever state the panel expects without ordering a different part. Most access control panels supervise the DPS input as a dry contact; the 679-05 family is rated 0.3 A at 30 VDC and the 7764/7766 at 0.25 A at 30 VDC, both well above a panel input but well below a lock load. Never use a DPS contact to switch a lock or a strike.

The FSS1 is different: it is a powered sensor (10 to 30 VDC, typically 50 mA), so it needs a supply conductor pair in addition to the signal output, and it reports tampering of its cover as a silent or audible alarm at the door or across the network. Budget that current in your power supply calculation. Electrified openings are electrical work: wiring belongs to a qualified technician, and the authority having jurisdiction (AHJ) and local code govern how the door must behave on fire alarm and power loss. Write the sequence of operation (what the lock, DPS and REX each do on entry, exit, fire alarm and power loss) before you order, not after rough-in.

What to order: SPDT switches from system accessories, and the FSS1 flush sensor where tamper detection is a requirement.

Can the DPS live in the hinge, the lock or the maglock instead?

Yes, and on electrified doors it often should. Three FACTS examples:

1. Power transfer hinge with DPS. The SDC PTH-4Q-DPS is a 4-1/2 in. x 4-1/2 in. standard weight hinge with four 26 AWG conductors at 1 A per wire, 12/24 V per pair, plus a door status contact rated 250 mA at 30 VDC resistive. It installs in the center hinge position, is UL10B listed for 3-hour fire rated doors and is about $178 at NLS. The plain PTH-4Q has the same conductors without the contact. If you are already ordering a transfer hinge, the DPS version removes one frame bore. The trade-offs between hinges, door loops and transfer devices are in our comparison of electrified hinges vs door loops vs power transfer devices.
2. Lock case with DPS. The Schlage L283-483 case for L9090/L9092 electrified mortise chassis carries request to exit, latchbolt monitor and door position sensor in one case. It ships as the case only, right hand; armors, strikes, screws and cylinders are separate.
3. Maglock armature with DPS. The Securitron APS-62D is an armature plate for the M62 with the DPS option built in, and Securitron notes the DPS can be layered with BondSTAT for precise door state. Model differences across the Securitron line are in our M62 vs M32 vs M82 Magnalock comparison.

For exit device doors, PHI DS880 and NDS986 kits are magnetic reed switches that mount in the touchbar endcap and frame, rated 1.5 A at 24 VDC SPDT.

What to order: the SDC PTH-4Q-DPS hinge when the door needs power and status through the same hinge.

What should be on the DPS order sheet?

Run every opening through these fields before you submit the order:

• Door material and frame material, separately. This decides HM vs WD vs plain 679-05.
• Bore allowed or not. No bore means surface (7766) or a DPS built into another device.
• Frame fill. Grout-filled hollow metal frames make concealed head mounting harder; confirm before ordering concealed.
• Threat level. Standard reed switch for traffic doors; FSS1 where a magnet defeat is a realistic attack.
• Panel input type and whether you land NO or NC.
• Other electrified devices on the leaf. A transfer hinge, electrified mortise case or maglock may already carry DPS.
• Fire rating of the opening. Confirm listings with the AHJ before modifying any labeled door or frame.

Field-proven extras that prevent callbacks are covered in our list of access control accessories that prevent service calls.

What to order: start in access control system accessories and filter by mount type.

Common mistakes

1. Ordering 679-05 for a hollow metal door because it is the shortest part number. The HM suffix is the hollow metal door and frame version.
2. Treating "door closed" as "door locked." A DPS cannot see the latch; add a latchbolt monitor or bond sensor.
3. Boring a concealed switch without the manufacturer template and oversizing the hole in a hollow metal frame.
4. Specifying an FSS1 high-security sensor on interior traffic doors where a standard SPDT reed switch does the job.
5. Forgetting the FSS1 needs power (10 to 30 VDC) and counting it as a dry contact in the supply budget.
6. Ordering a separate DPS when the transfer hinge, mortise case or maglock armature could carry it.
7. Drilling a labeled fire door or frame for a switch without checking the listing and the AHJ.

FAQ

What is the difference between a door position switch and a request to exit? A door position switch reports whether the door is open or closed. A request to exit tells the panel someone is leaving intentionally so the open event is not logged as a forced door. Most monitored openings need both.

Is the 679-05 a Schlage door position switch? Yes. The 679-05, 679-05HM and 679-05WD are Schlage Electronics concealed SPDT magnetic switches. The suffix sets the door and frame material: none for wood and wood, HM for hollow metal, WD for wood door in a metal frame.

What is a 679-05 door contact rated for? All three versions are rated 0.3 A at 30 VDC and listed UL10C/CAN-ULC-S104. That is a signal rating for a panel input, not a lock load.

Is a DPS door switch the same as a 7764 door contact? The 7764 is a concealed flush SPDT door position switch rated 0.25 A at 30 VDC for aluminum, wood and hollow metal doors. It is the concealed option when one part has to cover mixed door materials.

Next step

Browse access control system accessories or go straight to the 679-05HM, the 7766 surface switch or the SDC PTH-4Q-DPS hinge. Orders placed by 3 p.m. ET ship the same day, and ground shipping is free from $450. For a multi-door schedule, send it to the quote desk; public agencies can use government PO intake.