DORTRONICS SYSTEMS 48900 Series User manual

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 1 of 16
48900 Series USER CONFIGURED INTERLOCK CONTROLLER
The 48900 series PLC interlock controller is a cost-effective method for operating door interlock and mantrap systems with up to nine
doors. The fully integrated controller is a one-board solution that gives the user complete control over the operational logic. Doors may be
normally locked or unlocked, fail safe or fail secure. They may be selectively interlocked or operated independently of the other doors.
Lock relays can be set for either powered or unpowered (dry) contacts.
Switches and jumpers are used to configure the controller for the specific application required. No programming skills are needed. There are three
adjustable on-board timing functions. One timer energizes the door alarm relay if a door is propped open. A second timer controls the unlock time when
enabled. A third timer controls the time that doors remain unlocked during an emergency egress.
The complete system includes a 4 Amp 12 - 24 Volt DC power supply with Fire Alarm Interface in a lockable metal enclosure.
FIG. 1
A Emergency Unlock Input H Door Configuration Jumper O Red-Green Traffic Light Outputs
B Interlock Shunt Input
I
Output Configuration Switches P Door Alarm Output
C Door and Access Control Inputs
J
Lock Control Relays Q Panic Alarm Output
D SD Memory Card Slot K Lock Output Wet Dry Select R Master Fuse
E System Power Input L Lock Control Outputs S Door Status Out – Dry
F Timer Adjustment Controls M Lock Power Fuse 2 Amps T System Status Lights
G Interlock Setting Switch Block N Lock Ground Return Terminals
48901 shown

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 2 of 16
OVERVIEW
The
48900 controller allows for any combination of up to nine
doors to be interlocked by setting the appropriate switches.
The user may set doors for normally unlocked, or normally
locked operation, requiring an access control signal to unlock
when interlocked doors are secure.
There are nine lock control relays that can power locks directly
(wet contact). Each can also operate as dry contact to switch
power by others and for for automatic doors.
The user may select fail secure (relay energizes to unlock the
door) or fail safe (relay energizes to lock the door) operation.
There are nine dry contact outputs to mirror door status back to
access control devices when needed.
Nine powered outputs are provided to light door or lock status
red and green LEDs. Locked door indicating lights show door
status (green when locked but available and red when locked
but not available because an interlocked door is in use). Lights
for unlocked doors show lock status (red when locked, green
when unlocked).

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 3 of 16
HOOKUP
STEP
ITEM
I/O
AWG
REMARKS
1 Door Position Switches
IN
22
-
18
Contacts
must
close when door closes
–
IMPORTANT!
2 Access Control
IN
22
-
18
For
normally
locked doors
.
Dry contact
only
: p
ushbutton,
motion detector, card reader, key pad or similar. Contacts
close to request access
.
3 Door Control Relay:
Locks
OUT
16
-
14
Powered locks use the fused contacts. Positive goes from
“
0
”
(NO) or “I” (NC) to lock. Lock ground return goes to Ground
return terminals
-
fig 1
N
.
4 Door Control Relay:
Automatic Doors
OUT
22
-
18
Relay either mirrors REX input (locked door setting
) or
interrupts “OPEN” request circuit (unlocked setting) - dry
contact only.
5 Traffic Lights
OUT
20
-
18
For LEDs, connect anode to R or G and cathode(s) to the
center terminal.
6 DPS Out
OUT
22
-
18
The door position can be output to access
control or to remote
console. Both normally closed and normally open contacts are
available.
7 Emergency Unlock
IN
22
-
18
C
onnects to dry contact pushbutton, pull box, or other device
used to unlock all doors for an emergency egress.
8 Shunt and Reset
IN
22
–
18
Short the
Shunt input to override the interlock function.
Use wire jumper to enable alarm auto-reset or connect to
momentary switch such as a keyed switch for manual rest.
IN
OUT

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 4 of 16
CONFIGURE THE INTERLOCK
STEP
ITEM
REMARKS
1
Set Locked or Unlocked
Locked doors require a request
:
pushbutton or access control to open
2
Set Interlocks
Use switch settings to interlock sets of doors
3
Set Wet or Dry Contacts
Door control relays can power locks directly or can be dry contact.
4
Set Safe or Secure
Relay energizes to lock
(safe) or energizes to unlock (secure)
OPTIONAL SETTINGS
5 Enable Timers as Needed
Enable: door unlock time, allowed open time, and emergency unlock
time
6
Adjust Timers Used
Rotate trim pots to adjust delay for each enabled timer
7 Select Forced Door on/off
Turn off for
access
-
controlled
doors with crash bars or levers for
free
egress.
1. LOCKED/UNLOCKED
LOCKED DOORS (Fig 1 C)
Any door requiring a request to open (REX) is treated as a locked
door. Closed contacts at the REX will unlock the door for access or
signal automatic door open to operate.
UNLOCKED DOORS
Doors that are normally unlocked unless an interlocked door is open
do not need a request to open. REX input is ignored.
FACTORY DEFAULT SETTINGS – AS SHIPPED
No interlocks are selected. Lock relays energize to lock (Fail Safe) Doors are unlocked
No timers are enabled EO triggers on contact closure Outputs are dry contact
Forced door set to off

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POWER JUMPER (Fig 1 K)
To power devices such as locks, lights, strobes and
sounders directly from the door control relays, install
a jumper on the W pins.
With no jumper or with the jumper on the D pins,
relay contacts are dry.
Each door control relay can be set for wet or dry.
2. INTERLOCKS
3. WET OR DRY CONTACTS
DOOR
INTERLOCKS
1 2, 3, 4, 5, 6
2
1, 3, 4, 5, 6
3 1, 2, 4, 5, 6
4
1, 2, 3
5
1, 2, 3
6 1, 2, 3
7
No interlocks
8 No interlocks
9
No interlocks
INTERLOCKING DOORS (Fig 1 G)
In the example shown, the switch is moved to the yes (Y) position to interlock
two doors. A table is helpful to visualize relationships. See last page notes
section for blank interlock tables that can be filled out.
Important: one switch is used to interlock two doors. For that reason, door 2
interlock choices start with door 3 since doors 1 and 2 are already selected
under door 1 choices. Door 8 has only a single choice (9) for that reason.

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
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4. SAFE OR SECURE
OPTIONAL SETTINGS
5. ENABLE TIMERS
6. ADJUST TIME VALUE
SAFE OR SECURE (Fig 1 I)
In the example shown, doors 1-6 are SECURE position. Relay will
energize to unlock. Doors 7, 8 and 9 are SAFE. Relay energizes to
lock or inhibit access.
ARM TIMERS (Fig 1 G)
Timers for door propped alarm (PROP), door unlock
time (UNLCK) and emergency unlock time (FREE)
have to be armed to enable timers.
Set timer switch ON to arm or OFF to disable the timer
ADJUST TIMERS (Fig 1 F)
Set time to alarm on propped door. Set time doors will
unlock with a valid REX and set time that doors remain
unlocked for emergency release.
Propped open: rotate trim pot for any value between 15
seconds and 5 minutes.
Door unlock time between 2 seconds and 30 seconds.
Emergency Unlock (FREE) between 30 seconds and 10
minutes

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Rev 11/19/2021 Page 7 of 16
7. FORCED DOOR ALARM ON/OFF
VERIFY CONFIGURATION
RUNNING THE INTERLOCK
INTERLOCKED DOORS
When the system is idle, all doors are closed, no alarms or timers are active and the idle light is lit. When an
unlocked door is opened or a locked door is unlocked and/or opened, interlocked doors lock and remain
unavailable for access.
TRAFFIC LIGHTS
Traffic lights for locked doors show door availability: green when locked but available for access and red
when locked but not available because an interlocked door is in use or a violation alarm is active.
For unlocked doors lights show lock status: red when locked and green when unlocked.
EO - EMERGENCY UNLOCK
The emergency override (EO) unlocks all doors, and disables the interlock. All doors may be opened for
immediate egress. The door violation alarm is disabled while the system is in override.
SYSTEM STATUS (Fig 1 T)
PWR - The power LED lights when the board is connected to 12 – 24 VDC. Verify power is on.
WD – The Watch Dog LED blinks at a constant rate of 3 times per second to indicate that the
program is executing correctly. If the WD stops flashing or flashes at a different rate,
call Dortronics Technical Support.
TMR - When lit, indicates that one of the three timers is running.
PANIC – When lit, indicates that the emergency unlock function is active. All doors are
unlocked.
ALARM – When lit, indicates that the system is in door violation alarm. Make sure all
interlocked doors are closed. For test purposes, jump DPS inputs with wire.
IDLE – When lit, indicates all interlocked doors are closed and the system is waiting.
FORCED DOOR (Fig 1 I)
Select forced door on or off for door violation alarm. When off,
only an interlock violation energizes the door alarm relay. When
ON, opening a locked door without valid REX sounds alarm. Set
to OFF for locked doors with mechanical exit hardware.

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 8 of 16
AUTOMATIC DOORS
Automatic doors, rollups and motorized sliding doors can be configured as locked doors (the output follows
the REX input if no interlocked doors are open) or they can be treated as unlocked doors where the relay
breaks the “OPEN” request circuit inhibiting the opener when an interlocked door is open.
NOTE: Automatic doors using the locked configuration will open when the emergency override is active.
When configured as unlocked and fail safe, auto doors will not be inhibited or interlocked when the override
is active and will only open when requested. Consult local safety and containment guidance.
ALARM RELAYS
Interlock Violation Alarm: if two interlocked doors are open at the same time, the violation alarm relay
energizes. The violation alarm can be used dry contact or wet contact with a jumper.
When the Forced Door option is enabled, the alarm relay will energize if any locked door opens without a
valid REX.
When the Door Propped option is enabled, the alarm relay energizes when any door is open for a time that
exceeds the Door Propped Timer setting.
Emergency Override Alarm: when the EO input is triggered and/or if the EO timer is running, the panic
alarm relay is energized. Panic relay is dry contact. It may be used to switch power or send an alarm signal
to other equipment.
IMPORTANT:
Override can be triggered by either normally closed or
normally open contacts at the EO input. Select desired
trigger by setting EO switch on interlock switch bank Fig 1G

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 9 of 16
PROPPED DOOR TIMER
The Door Propped timer, when enabled, begins counting down as soon as any door is open. If the door is
open when the timer expires, the door alarm output relay energizes. Use the rotary control to set the time
delay to any value between 15 seconds to 5 minutes.
EMERGENCY UNLOCK TIMER
The Interlock timer, when enabled, begins timing when the Emergency Unlock input is activated. All doors
remain unlocked and automatic doors remain enabled or open (see page 8) until the timer expires. Set to
any value between 30 seconds and 10 minutes. Emergency unlock overrides System Pause and unlocks all
doors. Door/lock lights go green.
UNLOCK PAUSE TIMER
This is typically used when a momentary REX device is located some distance from the door. The timer
allows the user time to get to the door and open it after making a request for access. The Pause timer,
when enabled, determines the time a locked door remains unlocked after a valid request by access control,
a pushbutton, motion detector or similar device. This only applies to doors that are set as normally locked.
Use the rotary control to adjust the unlock time between 2 and 30 seconds.
DOOR STATUS OUTPUTS (S)
Door Status relays are energized when the associated door is closed. Contacts are dry.
INPUT STATUS INDICATORS (C)
When an input is grounded the input is active, indicated by a lighted LED. The inputs for the 48900
programmable controller are opto-isolated for protection against interference.
Door Position Switches, Magnetic Bond Sensors and similar devices communicate door status - when the
door is closed the switch contacts are closed.
When a door is closed the red input LED for the door will be lighted. This makes it easy to verify interlock
operation and to troubleshoot a new installation. When the door opens, the LED should turn off.
For other REX devices such as Bio-sensors, card readers, motion detectors, pushbuttons, pneumatic
switches and the like, the green input LED should be on when the REX is active.
LOCK RELAY STATUS INDICATOR LED (J)
LEDs indicate that an output relay is energized. With the output set for FAIL SECURE, the relay energizes
to unlock or enable the door. Set for FAIL SAFE the relay energizes to lock or disable the door. Make
connections accordingly.
For verifying desired operation, compare lighted inputs to the lighted relay indicators.

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 10 of 16
OTHER FEATURES
INTERLOCK BYPASS - SH
Closed contacts at the shunt input bypasses the interlock function. Door
alarms for forced door, interlock violation and propped open are disabled
when interlock is shunted. Locked doors remain locked and require valid
request for access, but there are no interlock restrictions for use.
AUTO ALARM RESET - AR
Closed contacts at the auto-reset input allows the door violation alarm to
end when the violation is corrected. For manual reset, connect a
momentary, normally open switch. The alarm state will end when the
violation is corrected and the reset button is pressed. A keyed switch
can be used to select either auto or manual reset as required. Jumper
the input with wire to make auto reset fixed (as shipped from factory).
EMERGENCY OVERRIDE - EO
Closed contacts at the override input unlock all doors for immediate
egress. The interlock function and the door alarm functions are disabled.
This is in addition to the Fire Alarm input of the 4204-NX power supply,
which drops power to the entire system when triggered.

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 11 of 16
TROUBLE SHOOTING THE INSTALLATION
Visual indication of all inputs, outputs and system status is provided for verification of all
conditions and settings. If the installation does not operate as desired, check the
following in the sequence shown:
NOTHING WORKS
1. POWER LIGHT - The controller requires 12 – 24 VDC to operate. Verify the green POWER LED is lit.
If not:
a. Check the power supply connections
b. Check the power supply output terminals
c. Check the Power Supply fuse
d. Check the Mains connection and the fuse at the 110 VAC terminal.
2. WATCHDOG LIGHT - If power connections are correct and the POWER LED is lit, verify that the
Watchdog LED is blinking at a constant rate of 3 blinks per second. If it is not blinking, call Dortronics
Technical Assistance.
3. DOOR INPUT LIGHTS - Verify that each interlocked door is closed and that the input LED for each
interlocked door is lit. Unused door inputs can be jumped out if needed.
4. REX INPUT LIGHTS – For Locked Doors Only:
a. Verify that no REX inputs are active and that no rex input lights are lit.
b. Make sure door is correctly configured. Verify that the door configuration
jumper is installed in the Locked position.
c. To test a REX input, use a short piece of wire to jump the two REX input
terminals. Verify that when a designated REX input is active, the corresponding lock relay
changes state (shown by the relay LED for the lock relay being tested). Door 1 REX operates
Door 1 lock and so on.
5. LOCK RELAY “ON” LIGHTS
a. When the system is IDLE and the idle light is on, verify that all normally unlocked fail secure
doors show a lit (energized) relay.
b. Are the relays on when they are supposed to be?
c. Verify that all normally locked fail secure relays are not energized (relay LED is off).
d. For Fail Safe settings, the relays should be ON when locked and off when unlocked at idle.
6. If the relays do not reflect the desired state check:
a. The door configuration is correct for the desired operation.
b. The door position inputs for all doors in the interlock are closed – the input LED is on.
c. That no REX inputs are active – REX LEDs are all off.
Make sure the doors are correctly set for the desired operation.
For a normally locked door set switch corresponding to the
door to the “on” or up position. For Fail Safe lock operation, set
the switch corresponding to the door in the up or “ON” position.

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 12 of 16
NO LOCK POWER
1. Check the lock relay fuse.
2. If the controller supplies power to the locks check that the jumper is on
the W position. Use a multi-meter to verify that lock relay common is
at the supply voltage.
3. Check that the lock is connected to the correct output. For Fail Secure
operation the mag lock connects to N.C. contacts. Strikes connect to
N.O. contacts.
STAYS IN DOOR ALARM
1. Check that all interlocked doors are closed - door inputs are “ON”. If there is any doubt that a door
position switch is operating correctly, use a piece of wire to jumper the input. Remember: DPS inputs
show red and REX inputs show green input LEDs.
2. Check that the Panic (emergency unlock timer) is not set and running. System Idle light should be lit.
DOOR LOCKS WHEN IT SHOULD UNLOCK
1. Make sure the lock is connected to the correct contacts on the lock relay. Some locks can be set for
either Fail Safe or Fail secure operation. Make sure the lock type matches the controller lock logic.
Fail secure lock relays energize to unlock.
2. Check that the Fail Safe – Fail Secure setting is correct for the application.
DOORS REMAIN UNLOCKED AT ALL TIMES
1. Check Panic relay and System Status Panic light. If they are on, check that the Panic N.C. – N.O. switch (SW3) is set
correctly. If the switch is set to N.C. and there is no Panic input, the doors will remain unlocked. If the switch is set to N.O. and
the panic input is closed (light is lit) the doors will remain unlocked.
Verify the input light is lit for every interlocked door. Remember, door switch closes when door is closed.

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
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SAMPLE INTERLOCK SETTINGS

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POWER SUPPLY SPECIFICATIONS
The 4204NX power supply/charger converts a 120VAC 60Hz input into a single PTC protected Class 2
power-limited output. Output is selectable for 12VDC or 24VDC with a total of 4A max. It also offers a suite
of features that includes fire alarm disconnect, overvoltage protection, and low power disconnect which
prevents deep discharge of stand-by batteries.
Input
Voltage 120VAC, 60Hz, 3.5A max.
Fusing 5A / 250V.
Outputs
Voltage 12VDC or 24VDC selectable.
Current 4A continuous max.
Protection Fused 2.5A / PTC 2A.
Auxiliary Class 2 power-limited @ 1A (unswitched).
Other Overvoltage protection.
Filtered and regulated.
Back-up Battery (not included)
Capacity 7AH / 12VDC (1 or 2 within enclosure).
Type Sealed lead acid or gel type.
Fuse Rating 5A @ 32VDC.
Failover Upon AC loss, instantaneous.
Fire Alarm Disconnect
Supervised Latching or non-latching.
EOL 10K Resistor.
Supervision
AC Failure Form “C” contacts.
Battery Form “C” contacts.
Low DC Power Shutdown
Shuts down DC output terminals if battery voltage
drops below 71-73% for 12V units and 70-75% for
24V units to prevent deep battery discharge.
Indicators (LED)
Input 120VAC is present.
DC Output Powered.
Battery Discharged or not connected.
CONTROLLER SPECIFICATIONS
Qty
Description
Remarks
Power In 12 or 24VDC regulated - plus, common and earth ground 3 - Screw Terminals
Inputs 21 9 DPS, 9 REX, 1 Panic and 1 Shunt Screw Terminals
Outputs 28 9 Fused Lock Relays, 9 Door Status Out, 9 R/G Light Powered Outputs Screw Terminals
Timers 3 Single Turn Rotary Adjusters to set Time Delay
Temperature Operating 0-60° C
Mounting Standoffs
Dimensions 10” W x 12” L x 1 ¼” H without
Fuses 10 2 Amp @ 250 Volts – quick blow
Current Draw ‐ Condition Current in mA Volts
Controller with traffic lights DPS all relays off
100 12
with all relays on – all indicator lights lit
410 12
Controller with traffic lights DPS all relays off 80 24
with all relays on – all indicator lights lit 290 24

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 15 of 16
RECOMMENDED EQUIPMENT
DORTRONICS PART# DESCRIPTION
Dortronics #1110xDxB 1200 lb electromagnetic 12/24 VDC maglocks with built-in door position and bond sense switches.
Dortronics #7201xL2-H High intensity Red / Green LEDs on single gang S/S wall plate.
Dortronics #7202xL2-HxCS High intensity Red / Green LEDs with Piezo sounder on double gang S/S wall plate. (Optional
for use with security breach alarm output.)
Dortronics #5216 MP23PP/RXE2 Panic mushroom switch latching push, pull.
SALES - WARRANTIES
Contact (Sales):
Mike Palermo – Sales/Customer Service
Sales/Applications Specialist Bryan Sanderford ‐ National Sales Manager
Contact (Technical): Stuart Arthur
Joe Hanna – Engineer/Applications Specialist
Contact (Credit): Janice Wilson – Accounting; New Customer Accounts
Product Warranties:
All electromagnetic locks have a LIFETIME GUARANTEE against defects in material and workmanship.
Defective units will be replaced or repaired based upon incoming evaluation and inspection.
All other Dortronics components of the Electric Locking System shall be similarly warranted for a period of
one year. Expressed warranties are conditionally based on the requirement that the items covered within
the guarantee are used and maintained in accordance with the manufacturer's recommendations. The full
warranty policy is accessible on our website. https://dortronics.com/sales‐policies‐and‐procedures/
A Return Authorization Number must be obtained and accompany all returns within 14 days of issue.
Unused items returned for credit must be complete and packed in original unit box and are subject to a 15%
restocking fee. Any shipping or order discrepancies must be reported within 5 days of receipt.
www.dortronics.com

48900 INTERLOCK CONTROLLER USER MANUAL 1.10.0
Rev 11/19/2021 Page 16 of 16
INSTALLATION AND OPERATION
NOTES
INTERLOCK SCHEDULE FOR
______________
Door ID Door Use Prohibits
Door
s
1
2
3
4
5
6
7
8
9
Date _____/_______/__________
INTERLOCK SCHEDULE FOR
______________
Door ID Door Use Prohibits
Doors
1
2
3
4
5
6
7
8
9
Date _____/_______/__________