Product Overview

The SDC EntryCheck™ 923 is a surface-mount digital keyless entry system designed for indoor and outdoor access control applications. It features a backlit keypad for easy readability and a heavy-duty, vandal-resistant cast housing with a mounting plate suitable for rugged surfaces or standard single-gang electrical boxes.

The 923 supports up to 500 users, each assignable to a 4 to 6 digit PIN code. Access can be programmed to activate one or both onboard relay outputs. A timed "anti-passback" feature prevents credential reuse within a programmed waiting period.

System status is indicated by two solid-state LED indicators: the left bi-color LED shows power (red ?) and active relay (solid green ?), while the right indicator flashes yellow (?) during programming mode. An internal sounder can be programmed to beep on key presses or output activation, with volume adjustable via an internal jumper.

The SENSE input offers two configurations: "Door Sense" to detect door open/closed status (detecting forced entry or door ajar conditions) and "Inhibit" to disable access via a service switch or timer. The "Auto-relock" feature can immediately turn off the Main Relay output when the door is closed after access, preventing tailgating.

The REQUEST-TO-EXIT input allows codeless activation of relays via a pushbutton. An ALARM SHUNT signal is available when access is granted, which can be programmed to shunt alarm contacts to prevent false alarms.

The unit operates on 12 or 24V AC or DC. Non-volatile EEPROM memory retains codes and programming during power loss. The Main Relay has a 5 Amp capacity, the Auxiliary Relay has a 2 Amp capacity, and two solid-state outputs can sink 100 mA for various signaling functions.

Features

• Keypad programmable
• 500 user codes
• 4 to 6 digit user codes
• 4 independent outputs
• 4 independent timers
• 2 Form C relay contacts
• 2 solid state open collector outputs
• Program entry codes to activate one or two relays
• Disable input
• Door sense input
• Request-to-exit/Reception input
• Keypad tamper lockout
• Timed anti-passback
• Anti-tailgate
• Two LED status indicators
• Tactile key feel
• Audible code entry verification
• 12V or 24V, AC or DC operation

Specifications

QuickStart Programming

To perform any function, you must first enter programming mode. The yellow indicator (?) will blink slowly. After selecting a function, the yellow indicator flashes rapidly while waiting for input. A brief green light (?) indicates accepted programming; a red light (?) indicates an error, requiring the function to be re-entered. Programming mode exits after 30 seconds of inactivity or by pressing **#.

Programming Mode Entry

Press: #9# + Master Code + #

Default Master Code: 123456

Programming a New User Code

1. Enter Programming Mode: #9# 123456#
2. Set Entry Code Length (e.g., 4 digits): 03# 4#
3. Set Main Relay Activate Time (e.g., 5 seconds): 21# 5#
4. Assign PIN code '9876' to momentarily activate the main relay: 01# 9876# 9876# 1#
5. Exit Programming Mode: **#

Testing the New User Code

Enter user code 9876#. The green indicator (?) should illuminate, the main relay should activate, and the door should unlock for 5 seconds.

Adding Additional User Codes

Once code length and relay times are set, you can add more users:

1. Enter Programming Mode: #9# 123456#
2. Assign PIN code '2222' for momentary main relay activation: 01# 2222# 2222# 1#
3. Assign PIN code '2580' to toggle the main relay: 01# 2580# 2580# 10#
4. Exit Programming Mode: **#

Deleting a User Code

1. Enter Programming Mode: #9# 123456#
2. Delete user PIN '9876': 02# 9876# 9876#
3. Exit Programming Mode: **#

Wiring

Refer to wiring diagrams for detailed connections. Use appropriate gauge wire (18 AWG or larger for lock power, 22 AWG or larger for signal connections).

Output Connection (Electric Door Strike)

Install a low-voltage fail-secure electric door strike. Route two wires from the strike to the keypad. Connect an MOV across the strike coil wires. Connect the strike's positive (+) wire to the keypad's MAIN RELAY N.O. (yellow wire). Connect the strike's other wire to the keypad's PWR(-) (black wire). Connect the keypad's MAIN RELAY COM (white wire) to the keypad's PWR(+) (red wire).

Power Connection

Connect the power supply output terminals to the keypad's PWR(+) (red wire) and PWR(-) (black wire). Observe polarity for DC supplies; AC transformer polarity is not critical.

Caution: If using AC power, ensure the transformer's secondary is isolated from earth ground.

Earth Ground

Connect the green earth ground wire to a proper earth grounding point (18 AWG recommended) to prevent damage from static discharge.

Sense Input

The SENSE input (gray wire, E8) can be configured as either "Door Sense" or "Inhibit".

• Door Sense: Connect a normally closed door position switch to the SENSE wire (gray/E8) and a COM wire (black). This detects forced entry or door ajar conditions.
• Inhibit: Connect a normally open switch or timer to the SENSE wire (gray/E8) and COM wire (black). This disables access when active.

Request-to-Exit (REX) Input

Connect a normally open pushbutton to the keypad's REX wire (violet/E6) and COM (black wires) terminals for codeless access activation.

Solid State Outputs (#3 & #4)

These "open collector" outputs can activate indicators or sounders. Examples:

• Example 1: Output #3 lights an LED; Output #4 lights an LED and sounds a beeper.
• Example 2: Output #3 lights a lamp powered from an external source; Output #4 triggers a normally open alarm panel zone using an end-of-line resistor.

Maximum rating for solid state outputs is 100 mA to common.

Wiring Diagram Descriptions

Figure 2 (Wiring Pigtail Color Code): Illustrates the color coding for the keypad's wire pigtail, connecting to power supply, relays, and various inputs/outputs.

Figure 3 (Basic Door Installation): Shows a typical setup with the keypad, electric strike, and optional door sensor switch.

Figure 4 (Basic Door Installation Wiring): Details the connections between the keypad, power supply, door strike, door sensor, and REX switch, including wire assignments for relays and outputs.

Figure 5 (Using Solid State Outputs): Provides schematic examples for connecting LEDs, beepers, lamps, and alarm panel zones to the solid state outputs.

Factory Defaults

The following are the factory default settings:

• Master Programming Code: 123456
• Entry Code Length: 4 digits
• Request-to-exit Output Relay: No Output
• Alarm Shunt Output: Disabled
• Forced Entry Output: No Output
• Door Ajar Output: No Output
• Main Relay On Time: 02 Seconds
• Auxiliary Relay On Time: 02 Seconds
• Solid State Output #3 On-time: 02 Seconds
• Solid State Output #4 On-time: 02 Seconds
• Door Sense/Inhibit Input: Inhibit
• Keypad Lockout Output: Disabled
• Keypad Active Output: Disabled
• Beeper Sounds When Key Pressed: Yes
• Beeper Sounds During Relay #1/#2/#3/#4: No
• Keypad Lockout Count: 3 Tries Before Lockout
• Anti-Passback Time: No Anti-Passback
• Auto-Relock: On

Basic Programming

The yellow indicator (?) blinks slowly in programming mode. It flashes rapidly when waiting for input. Green (?) indicates acceptance, red (?) indicates an error. If an error occurs, press *9# to clear the current command and re-enter.

Entering Programming Mode

Press #9# followed by the current 6-digit Master Programming Code and #.

Exiting Programming Mode

Press **#. The red indicator (?) will light briefly. The system also exits automatically after 30 seconds of inactivity.

Setting Entry Code Length

Press 03# followed by the desired length (1-6) and #. This should be done before programming entry codes.

Adding a New PIN Code

Press 01# + New Code + # + New Code + # + Relay Assignment + #.

• Relay Assignment: 1=Main Relay, 2=Auxiliary Relay, 3=Both. Use 10, 20, 30 for toggle mode, or 12, 21 for mixed timed/toggle.
• Example: 01#1234#1234#1# assigns PIN 1234 to activate the Main Relay.
• Example: 01#5678#5678#20# assigns PIN 5678 to toggle the Auxiliary Relay.

Note: Leading zeros for PINs are handled by the system based on the set code length but must be entered by the user.

Output Toggle Mode

When an output is set to toggle mode, it switches between ON and OFF with each activation. A toggled ON output remains ON until toggled OFF, or until a timed code or REX input is used (which may not turn off a toggled output depending on configuration).

Erasing a Single User

Press 02# + PIN to be deleted + # + PIN to be deleted + #. The yellow indicator (?) flashes during erasure, and green (?) confirms completion.

Changing the Master Programming Code

Press 98# + New Master Code + # + New Master Code + #.

Programming Options

Various outputs and behaviors can be configured using specific command codes:

• Erasing All Entry Codes: Press 97#000000#000000#. This erases all user PINs.
• Configure Sense Input: Press 10# + Input Type (0=Door Sense, 1=Inhibit) + #.
• Select Forced Entry Output: Press 11# + Output (0, 2-4) + #. (Output 2=Auxiliary Relay, 3=Output #3, 4=Output #4).
• Select Door Ajar Output: Press 12# + Output (0, 2-4) + #.
• Select Keypad Lockout Output: Press 13# + Output (0-4) + #. (0=No Output, 1=Main Relay, 2=Auxiliary Relay, 3=Output #3, 4=Output #4).
• Select Keypad Active Output: Press 14# + Output (0-4) + #.
• Select Alarm Shunt Output: Press 15# + Output (0-4) + #.
• Select Request-to-Exit Output: Press 16# + Output (0-4) + #.
• Anti-Tamper Output: Press 17# + Output (0-4) + #.
• Main Relay On-time: Press 21# + Seconds (1-60) + #.
• Auxiliary Relay On-time: Press 22# + Seconds (1-60) + #.
• Solid-state Output #3 On-time: Press 23# + Seconds (1-60, 99=Toggle) + #.
• Solid-state Output #4 On-time: Press 24# + Seconds (1-60, 99=Toggle) + #.
• Door Ajar Timer: Press 25# + Seconds (1-60) + #.
• Beep Sounds on Keystrokes: Press 40# + Sound (1=Yes, 0=No) + #.
• Beep Sounds During Main Relay: Press 41# + Sound (1=Yes, 0=No) + #.
• Beep Sounds During Auxiliary Relay: Press 42# + Sound (1=Yes, 0=No) + #.
• Beep Sounds During Output #3: Press 43# + Sound (1=Yes, 0=No) + #.
• Beep Sounds During Output #4: Press 44# + Sound (1=Yes, 0=No) + #.
• Beep Sounds Anti-Tamper Activation: Press 45# + Sound (1=Yes, 0=No) + #.
• Keypad Lockout Count: Press 50# + Attempts (2-7) + #. (Refer to Option 13 to enable lockout relay).
• Anti-Pass Back Time: Press 51# + Minutes (2-4, 0=No Anti-passback) + #.
• Keypad LED Backlight: Press 52# + Mode (0=OFF, 1=30 sec activated, 2=Always ON) + #.

Resetting Keypad

Master Reset

Caution: A master reset erases all entry codes and restores factory defaults, but does not reset the Master Code.

1. Disconnect power.
2. Press and hold the * and # keys.
3. Apply power while holding the keys until the red indicator (?) flashes.
4. Release keys. Red (?) and yellow (?) indicators remain lit until reset is complete, then yellow turns off.

Resetting the Master Code

This procedure requires physical access to the keypad's internal jumper.

1. Remove the keypad from the wall and disconnect power.
2. Locate and remove jumper JP2 (refer to page 2 diagram).
3. Re-apply power. A single beep and momentary yellow LED (?) flash indicate success.
4. Replace jumper JP2.

The Master Programming Code is now reset to the default: 123456.

Mounting

Mullion Mount

The keypad can be mounted on narrow door frames (mullions).

Dimensions: 1.750" W x 7.3125" H x 1.375" D.

Wall Mount

The keypad can be mounted on standard walls or single-gang electrical boxes.

The mounting plate includes 4 holes for screws and expansion anchors.