G4S Technology S874A User Guide

Installation and User Instructions for S874-EX Keypad Readers

The S874 is a contactless smart-card reader, with LED’s and keypad. The
reader can be set to use Wiegand or

The S874 reader will read smartMAX encoded MIFARE cards and card
serial numbers from most ISO 14443A smart cards which have a 4-byte
UID (User Identification). The reader may be configured to read other card
types by presenting a programming card to the reader during start up.

For additional information regarding the installation, configuration and
proper use of this product:
SMS User Guide, P/N 9600-0429, M2150 Access Control Design Guide,
P/N 9600-0420,

Fit The Weather Proofing Kit

1

20mA current loop communications.

When mounting outside, the gasket kit must be fitted:
a) Remove the backplate from the reader after screwing

the securing screw ‘C’ fully IN.

b) Position the gasket between the back plate and the

mounting surface.

Note: For UL listed applications, use only
manufacturer provided gasket, P/N 87X-GASKET.

2

Mount the Backplate

Mount the backplate using countersunk headed screws
adjacent to the opening edge of the door.

If fixing hole ’A’ is used then the breakout must be removed
and the screw must not protrude.

Feed the cable from the controller through the backplate.
If the wall tamper function is to be used then the small hole in

breakout ‘B’ may be used to mark the position of the wall
screw before the breakout is removed. An appropriate wall
screw should then be adjusted in height to protrude through
the hole to activate the tamper lever.

The front cover is secured to the backplate by
UNSCREWING the securing screw ‘C’ via the small hole
in the enclosure so that the screw head locates in the
counterbored hole on the inside of the enclosure.

The screw should not be removed from the backplate.

You should find
that the backplate
has holes for
connection to most
standard electrical
backboxes.

B

A

C

3

Reader Connections

20mA current loop

Twisted pairs (use Belden

9504) cable or other UL
Listed style 2464 (DUZX)
cable.

0V

TX+

TX-

RX+

RX-

+V

Reader

Maximum distance

TB1

150m

Connect shield at
controller end
only.

0V

RX+
RX-

TX+
TX­12V

Controller

Wiegand

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

0V

RED

GRN

0
1

+V

Reader

Maximum distance

TB1

Connect shield
at controller end
only.

0V
Red
Green
Data 0
Data 1

12V

Controller

75m

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

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.

Reader Links

4

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.

5

Using / Testing the Reader

The reader is now working correctly.

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.

If the reader has been enabled for user-code mode at the controller, you can gain access by pressing the O key,
entering your card number, then pressing the P key.

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

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).

YELLOW – Enter your PIN. If you make a mistake, the RED LED’s are momentarily displayed, followed by
YELLOW LED’s, to prompt you to try again.

9600-0596. Installation and User Instructions for S874-EX Keypad

Readers, Issue 1.0.125th September 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.

©

Specifications

Input voltage: 9-14Vdc.
Input current: 120mA @ nom. 12Vdc.
Operating temperature: -40 to 158°F (-40 to 70°C)
Operating humidity: 15 to 90%, non-condensing.
Maximum read range: 4" (100mm).
Approvals: EN302291, EN301489