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Access Control Module V4.2

ACM12

Installation Instructions

paradox.com

Printed in Canada 05/2014                               ACM12-EI02

Introduction

The Access Control Module (ACM12) is designed to be used with the Digiplex EVO 
System control panels. Each ACM12 allows you to connect a reader, a REX device, a 
door contact and a locking device to control the access to one door. If desired, door 
contacts can also be assigned to zones in the control panel to link the doors to the 
alarm system. This will allow you to use the same door for the access control 
system and the alarm system. 

What’s New 4.2

Support for six additional schedule intervals for Door Unlock Schedule.

Added security when disarming your system. New option to disarm with 
access card and PIN code.

Technical Specifications

Installation

The module is connected to the control panel’s combus as shown in Figure 1. 
Please refer to the control panel’s Programming Guide for the maximum

 

installation distance. Devices connected to the PGM output must be connected as 
shown in Figure 2. Refer to Figure 5 for connection drawings for the REX device, 
reader, locking device and door contact.

The door contact follows the control panel’s EOL definition. When EOL is 
enabled and the door contact is not used, place a 1k

 resistor across the 

CT

 

and 

AUX

- input terminals. If EOL is disabled, use a jumper.

 

If the REX device is 

not used, place a jumper across the 

REX

 and 

AUX

- terminals.

AC Power

Use a 16.5Vac (50/60 Hz) transformer with a minimum 20VA. as shown in 
Figure 1. Do not use any switch-controlled outlets to power the transformer.

Backup Battery

To power the module’s door lock relay during a power failure, connect a 
12Vdc 4Ah rechargeable acid/lead or gell cell backup battery as shown in 
Figure 1. Connect the battery after applying AC power. 

Inverting the polarity when installing the battery will blow the battery 
fuse.

Connecting the External Negative Trigger

The ACM12 comes with an external negative trigger. You can use a PGM from 
the control panel or another module to release the access control door lock. 
The external negative trigger can also be triggered using a push-button. 
When the push button is pressed, the door will unlock. The PGM or push-
button must ground the negative trigger. Connect the push-button as shown 
in Figure 2. 

LED Display

AC (Green):

On when receiving AC power.

BATT (Green):

On when charging and during battery tests.

AUX (Yellow):

On when auxiliary output is active.

ERROR (Red):

Indicates a problem with the module.

RX (Green):

Flashes when receiving information from the panel.

TX (Green):

Flashes when transmitting information to the panel.

Connection Diagrams

Figure 1: Connecting the power and combus

Figure 2: Additional Connection Information

Figure 3: Connecting a 4-Wire Reader (R910 / R915)

Figure 4: Connecting a 7-Wire Routing Cable

Figure 5: Connecting Access Control Devices

Figure 6: Connecting for Firmware Upgrade (CONV4USB)

AC Power:

16Vac, 20/40VA, 50 - 60Hz

Aux. Power:

12Vdc, typical 600mA, 1A max.

Battery:

12Vdc, 4Ah minimum

No. of Outputs:

2; one 50mA PGM output, one form C relay rated at 
5A/28Vdc, N.O./N.C.

No. of Zones:

2 (Door Contact & REX device)

No. of Inputs:

2 (Negative Trigger & Tamper inputs)

Control Panel
Compatibility:

Any EVO control panel

Table 1: Special Display

Error

RX

TX

Condition

ON

OFF

OFF

Combus is shorted / No clock / No data

ON

OFF

ON

Wrong data / Invalid Combus address 
(Too many modules)

ON

ON

OFF

Future Use

ON

ON

ON

Combus lines reversed (YEL and GRN)

Flash

----

----

Combus power is too low

12Vdc

Rechargeable Battery: 
12V 4Ah min

Disconnect the battery before 
replacing the fuse.

Combus

Digiplex/

Digiplex EVO 
series control 

panel

AUX switch:

Press to toggle the AUX output.

To metallic enclosure

Ground clamp

Cold water pipe 

grounding

AWG #14 single 
conductor solid 

copper wire

From 

transformer

Connect to another 

module compatible with 

transformer sharing

Transformer Sharing

Transformer Sharing: Use one transformer to power 
multiple modules with transformer sharing.

And / Or

To PGM output

External Negative Trigger

External Tamper 

Switch (N.C.)

PGM

Connected up to 300m 
(1000ft) away.

If the ACM12 loses 
communication with the 
reader, it will show up as a 
Module Fail to Com. trouble.

R915

Reader

ACM-12

1: RED

to

(+)

2: BLK

to

(-)

3: GRN

to

(D0)

4: YEL

to

(D1)

Only connect one reader per ACM12

R910 (not shown) is connected the same way

If you use a routing cable, use a shielded 
routing cable. Do not connect the routing 
cable’s shield to the reader’s shield. Only 
connect the routing cable’s shield at the 
ACM12.

Connect

Reader

ACM-12

1: Red to

(+)

2: Black

to

(-)

3: Green

to

(D0)

4: White

to

(D1)

5: Brown

to

(Beep)

6; Orange

to

(RED)

7: Yellow

to

(GREEN)

CR-R880-BL

Only connect one reader per ACM12

CR-R885-BL (not shown) is connected the same way

Connected up to 152m 
(500ft) away.

When connecting the diode to the door lock, be sure to 
connect the cathode of the diode to the positive (+) 
voltage and the anode to the negative (-) voltage.

* = Follows control panel’s EOL definition.

** = If the door contact is not used, install a jumper or a 1k

 

resistor across the 

AUX

-

 and 

CT

 terminals depending on the 

control panel’s EOL definition.

*** = If the Request for Exit (REX) device is not used, place a 
jumper across the 

AUX

-

 and 

REX

 terminals.

Cathode

Anode

1N4007 

Diode

*** REX device must be 
connected to 

REX

 terminal

** Door contact 

must be 

connected to 

CT

 

terminal

No EOL required 
on REX

CV4USB

ACM12

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