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4

Reader Links

Present the card face-on to the reader until you hear a "bleep".

 Cards can

be presented in rapid succession; there is no

 

need, for example, to wait for "GREEN LED’s" to disappear before 

presenting another.

When faulted, the reader can not accept a card read.  Check wiring for faults or replace reader.

 

 

   

 

 

 

 

 

 

 

  The reader is now working correctly. 

9600-0595. 

Installation and User Instructions for S874 Readers, Issue 

1.0  31st August 2012.   G4S Technology, 2012. 

FCC  Notice: 

This  device  complies  with  Part  15  of  the  FCC  Rules. 

Operation is subject to the following two conditions: (1) This device may 
not  cause  harmful  interference,  and  (2)  this  device  must  accept  any 
interference received, including interference that may cause undesired 
operation.

Any unauthorized modification to this device may void the authority of 
the user to operate it. All trademarks acknowledged.

©

LED Status Indicator

GREEN 

 

The lock is released and you may open the door.

RED 

 

You do not have access rights to gain entry, or the reader did not read your card properly (in this case, 

present it again).

Specifications

Input voltage: 9-14Vdc. 
Input current:  120mA @ nom. 12Vdc.
Operating temperature: -13 to 158°F (-25 to 70°C)
Operating humidity: 15 to 90%, non-condensing.
Maximum read range: 4" (100mm).
Approvals: EN302291, EN301489

5

Using / Testing the Reader

Set SW1 switch2 (COM) to W for Wiegand communications, or C for 20mA current loop communications. Set 
SW1 switch1 (USER F/B - audio feedback) to 1 for sound on, or 0 for sound off. 

3

Reader Connections

0V

RX+
RX-

TX+
TX-

12V

Controller

0V

TX+

TX-

RX+

RX-

+V

Reader

TB1

20mA current loop

0V

Green
Data 0

Red

Data 1

12V

Controller

0V

GRN

0

+V

Wiegand

RED

1

Reader

TB1

Connect shield at 
controller end 
only.

Connect shield 
at controller end 
only.

Note:

 Use SW1 switch2 to select the communications mode (See Step 5).

Twisted pairs (use Belden 
9503) cable or other UL 
Listed style 2464 (DUZX) 
cable.

Multi conductor (Use 
Belden 9537) or other 
UL Listed style 2464 
(DUZX) cable.

Note:

 The 

FERRITE

 must be fitted!

Slide the ferrite sleeve onto cable before wiring terminal block.  Ferrite to be placed 50mm (2") up cable and held in place 
with cable ties.

Maximum distance 

150m

Maximum distance 

75m

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