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ACM24D - page 2

Wiring

Related Topics

Specifications

Installation / Wiring 

(see Imperial System Guide)

DIN Rail Enclosure

System Diagrams and Wiring Tips

Wire Gauge Selection

Features

Assigning a Reader to a Door (see page 3)

Bi-directional Locate Feature (see page 4)

Remote Firmware Upgrade (see page 4)

Applications

Access Control

BabyWare 

(see Imperial System Guide)

BabyWare

Power
Input Voltage

16-24Vac (50 or 60Hz), or 16-36Vdc
20VA, 40VA or 75VA (see table in wiring diagram 
below)

Aux. Readers:

12Vdc, 500mA max.

Aux. Locks:

6-12Vdc, 1.3A (see table in wiring diagram 
below)

Battery

12Vdc, 4Ah or 7Ah gel cell (see table in wiring 
diagram below)

RS485 Bus

900m (3,000ft) requires external 12Vdc power

No. of outputs

2 form C relays rated at 3.5A / 28Vdc (NO / NC)

No. of inputs

6 (1 door contact, 1 REX, and 1 trigger per door)

Dimensions

DIN9: 16cm X 10cm X 6cm (6.3” X 4” X 2.5”)

Operating 
Temperature

-10ºC to 50ºC 
14ºF to 122ºF

1

Reader Bus (500mA)

Connect up to 4 readers (2 per door). 
Supports R910 (V2.0 or higher), and 
R915 (any version). 

See "Assigning a 

Reader to a Door” on page 3.

2

Door Power Selection Jumper
J2 ON

 = Internal power (12Vdc) with 

Energy Saving feature

J2 OFF

 = External Power

See "Door Output Power Selection 
Jumper” on page 4 for more 
information.

3

AC/DC Input with Transformer 
Sharing

Modules with this feature can share a 
central transformer (16-24Vac, or 16-
36Vdc) throughout the system. Ensure 
that the total power output of the 
transformer is respected. There is no 
specific polarity. 

4

RS485 Access Bus

Connect to V32 RS485 Access bus. 
Ensure that it is powered by an 
external power supply (PS27D). This 
will not be necessary with an 
upcoming V32 hardware version, 
which will supply the power (see 
www.paradox.com for availability).

5

Battery Input

Connect a 12Vdc (4Ah or 7Ah) 
rechargeable gel cell battery. Apply 
AC power before connecting the 
battery. If battery wires are extended, 
use an external fuse to protect against 
a short.

REX Device

Contact

1 kΩ**

Optional external trigger

to unlock door

Fail secure

latch (N.O.)

12Vdc

*

Reader

In 1

Reader

Out 3

Reader

In 2

Reader

Out 4

Door 1

Door 2

J2 ON

~ ~

16-24Vac, or

16-36Vdc

Transformer

16 / 24 Vac

Transformer sharing

compatible modules

 12Vdc
Battery

+

-

PS27D Power supply

V32

A+B-

ETHERNET

10/100 Mbps

RS485 ACCESS

1

22

3

4

5

Transformer requirements table

Power 
Rating

Max. Lock 
Output

Max. Battery 
Charging

Reader 
Bus

75VA

1.3A

500mA

500mA

40VA

1.3A

350mA

500mA

800mA

500mA

500mA

20VA

External 
power (J2 off)

350mA

500mA

Time to fully charge battery

Battery 
Type

Batt Charge
350mA

Batt Charge
500mA

4Ah

11.5 hours

8 hours

7Ah

20 hours

14 hours

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