SIA OSDP · UL 294 · NFPA 101 Egress · Credential Point Schedule
When to use: Use this designer when scoping an access-control deployment to size controllers, input/output points, reader ports, and power supplies and to produce a credential / door point schedule. Define each opening's locking hardware, reader configuration, and protocol; the tool tallies points per door, assigns panels, and sizes the PSU with a 25% margin plus battery backup. Reflects OSDP multidrop wiring savings vs. legacy point-to-point Wiegand, and flags NFPA 101 free-egress requirements for maglocks (fail-safe + REX + fire-alarm release).
Global Configuration
prox/OSDP
mA
electric strike
mA
mag/delayed
mA
Doors / Openings (3)
3
Doors
3
Readers
6
Inputs
3
Outputs
3
Reader Ports
1
Controllers
Credential / Door Point Schedule
Door
Locking Hardware
Reader
Protocol
Panel · Port
Inputs
Outputs
Lock mA
Door 1
Electric Strike
Fail-secure (typ.)
Single reader IN
OSDP / SIA
P1 · #1
2
1
250
Door 2
Electric Strike
Fail-secure (typ.)
Single reader IN
OSDP / SIA
P1 · #2
2
1
250
Door 3
Electric Strike
Fail-secure (typ.)
Single reader IN
OSDP / SIA
P1 · #3
2
1
250
TOTALS
6
3
1110
Controller / Panel Layout
1 × 4-Door Panel (4 doors/panel) for 3 openings
Panel 1Door 1, Door 2, Door 3 (3/4)
Power Supply Sizing
Total Load (locks + readers)1.11 A
With 25% Design Margin1.39 A
Recommended PSU (12/24 VDC)2.5 A
Battery Backup (≈4 hr standby)5.5 Ah
OSDP vs. Wiegand
OSDP (SIA / IEC 60839-11-5): bidirectional, supervised (tamper/fault detection), encrypted with AES-128 Secure Channel, and multidrop — up to ~8 readers on one RS-485 bus, saving controller ports and wiring. Your design has 3 OSDP door(s), enabling shared-bus wiring. Wiegand: legacy, unencrypted, unsupervised, and point-to-point — one home-run cable and one dedicated reader port per reader.
Codes & Standards References
SIA OSDP / IEC 60839-11-5 — Open Supervised Device Protocol, AES-128 secure channel, multidrop RS-485
UL 294 — Access Control System Units (endurance, attack, standby power levels)