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CAA470A-EI02
PRINTED IN CANADA 07/2004

Introduction

Connected to the CT-V900 controller’s expansion bus, the 
2-Door Expansion Module (CA-A470-A) supports two 
readers, two BCD keypads, four zone inputs, 6 outputs 
and two locking devices. 

Specifications

DIP Switches 

In order for new DIP switch settings to take effect, 
the 2-Door Expansion Module’s power must be 
disconnected and then reconnected.

Assign Address (1 and 2)

DIP switches 1 and 2 determine the 2-Door 
Expansion Module’s address in the network, 
regardless of the order that they are connected 
to the controller. Centaur recognizes the doors 
according to the DIP switch settings as shown in 
Figure 1.

Figure 1: Setting the network address

Lock State during Communication Failure

DIP switches 3 and 4 determine the state of 
Lock #1 and Lock #2 ONLY during a 
communication failure between the 2-Door 
Expansion Module and the controller (CT-V900-
A). Normally, the lock outputs follow the Lock 
Control for the CT-V900-A. Therefore, the DIP 
switches should have the same setting as the Lock 
Control for the corresponding doors in Centaur.

De-energized

: no power in normal state; requires 

power to activate.

Energized

: power in normal state; remove power 

to activate.

Access during Communication Failure (5 and 6)

DIP switches 5 and 6 determine the access to 
the protected doors during a communication 
failure. 

Activate Output on Communication Failure (7)

DIP switch 7 determines if OUT5 and OUT6 will 
pulse during a communication failure. When DIP 
switch 7 placed in the 

ON

 position, the outputs on 

the device(s) connected to the OUT5 and OUT6 
terminals will pulse. For example, the LED on 
the reader can pulse to advise users that a 
communication failure has occurred.

DIP Switch (8)

For future use.

EOL Jumper

Place the EOL jumper ON if the 2-Door Expansion Module 
is at the beginning (Start Point) or at the end (End Point) of 
the E-bus Network (see Figure 2). Otherwise, place the 
EOL jumper OFF.

Figure 2: Setting the Jumpers

High/Low Bias Jumpers

Place the A+ and B- jumpers on LOW only if the 2-Door 
Expansion Module is at the beginning (Start Point) of the 
E-bus Network. Otherwise, place the A+ and B- jumpers 
on HIGH (see Figure 2 and Figure 3).

Figure 3: Setting the A+ and B- jumpers

350mA/700mA Battery Charging Jumper

The 350mA/700mA Jumper allows you to select the 
charging current for the backup battery of the 2-Door 
Expansion Module. Charging the battery at 350mA takes 
longer, but consumes less power. Charging the battery at 
700mA takes less time, but consumes more power.

Figure 4: Setting the 350mA/700mA jumper

Programming in Centaur

Using the Centaur Access Control Software, program the 
inputs, outputs, readers, and keypads connected to the 2-
Door Expansion Module. The options are explained in the 

Centaur Access Control Software Reference Manual

Centaur will identify the 2-Door Expansion Module by its 
address (see DIP Switches 1 to 4) and will recognize the 
devices as follows: 

Doors cannot be defined as 

Door Type

 Elevator 

(

Door Properties

 window, 

General

 tab, 

Door 

Type

Elevator

) and the module does not support 

Interlock Inputs (

Door Properties

 window, 

Inputs 

and Outputs

 tab, 

Interlock Input

). 

Other modules in the system cannot activate the 2-
Door Expansion Module’s outputs.

The 2-Door Expansion Module does not support 
Zone Doubling (see Figure 6).

CA-A470-A Specifications:

 

Readers:

connect 2 per module

Keypads:

connect 2 per module

Inputs: 

4 standard without ATZ, 1 tamper

Outputs:

6 (open collector)

Lock Outputs:

2 lock outputs (Form C relays)
each: 15A @ 16VDC (resistive)

AC Power: 

16VAC, 40VA max.

Frequency:

50Hz/60Hz

Aux. Current:

500mA (max.)

Battery:

12VDC, 7Ah
low battery = 10.2VDC
low battery restore = 12.2VDC
low battery cut-off = 8.5VDC

Communication:

expansion bus (E-Bus), RS-485, Plug 
and Play, 3 modules per CT-V900

Operating temp.: 5

o

C to 55

o

C (41

o

F to 133

o

F)

2-Door Expansion Module

CA-A470-A

Instructions

780 Industriel Blvd., Saint-Eustache (Quebec) J7R 5V3 CANADA
Tel.: (450) 491-7444                                       Fax: (450) 491-2313

www.paradox.ca

Lock #1 = DIP switch 3
Lock #2 = DIP switch 4

OFF

 =

De-energized:
During a communication failure, the normal state of
the lock output is De-energized. When Lock #1 or
Lock #2 is activated, power is 

applied

 to the

corresponding lock output to unlock the door.
Activation depends on the setting of the DIP switches
5 & 6 (Access during Communication Failure).

ON

 =

Energized:
During a communication failure, the normal state of
the lock output is Energized. When Lock #1 or Lock
#2 is activated, power is 

removed

 from the

corresponding lock output to unlock the door.
Activation depends on the setting of the DIP switches
5 & 6 (Access during Communication Failure).

Switch Setting

During a Communication Failure:

5 = off (0)
6 = off (0)

“No Card” 
Access is denied to all cards and doors
are locked until communication is restored.

5 = on (1)
6 = off (0)

“2 Cards” 
Access is granted only when 2 cards of
a valid format are presented to the reader.

5 = off (0)
6 = on (1)

“All Cards” 
Access is granted when any card with
a valid format is presented to the reader.

5 = on (1)
6 = on (1)

“Unlock Door”
Doors are unlocked until communication
is restored.

Address 1 Address 2 Address 3

Doors

Keypad/Reader 1 Door 3

Door 5

Door 7

Keypad/Reader 2 Door 4

Door 6

Door 8

Inputs

Z1

Input 17

Input 21

Input 25

Z2

Input 18

Input 22

Input 26

Z3

Input 19

Input 23

Input 27

Z4

Input 20

Input 24

Input 28

Outputs

OUT1

Output 7

Output 13

Output 19

OUT2

Output 8

Output 14

Output 20

OUT3

Output 9

Output 15

Output 21

OUT4

Output 10

Output 16

Output 22

OUT5

Output 11

Output 17

Output 23

OUT6

Output 12

Output 18

Output 24

Jumpers set to low

Jumpers set to high

A+

B-

LOW

HIGH

LOW

HIGH

A+

B-

Jumper set 

as 350mA

Jumper set 

as 700mA

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