2
Connecting the Keypad
The SMR20 reader provides a 12-key keypad for PIN entry. The flex tail of the keypad is connected to the electronic board via a
ZIF (zero insertion force) connector. The contacts are engaged/disengaged by a moving slide. Care must be exercised when
connecting and disconnecting the keypad. When connecting the keypad to the board, open the slide as shown. Insert the
electronics into the housing and insert flex tail in the ZIF connector. Then, close the slide to engage the contacts. To disconnect
the keypad, follow the previously described steps in reverse.
Slide Disengaged
Slide Engaged
Weather-Proofing the Reader
The reader is rated to operate over an extended temperature range.
However, if the reader is expected to be exposed to weather, the
weatherized option (-OW) must be ordered. The option is implemented
in two parts. With the (-OW) option, the electronics is conformal
coated against moisture. A tube of dielectric grease is supplied for the
installer to coat field connections to complete the procedure. After field
connection/configuration is made, the grease is to be applied on the
DIP switch slides, keypad connection, and the RJ-11 jack to seal out
moisture.
Î
Do not use sealant to seal reader case to the wall. Doing so will
trap water in the reader and may cause damage to the reader.
TTL Interface
The TTL interface has the standard 5-wire interface widely used
in the access control application. In addition, an input to control
the buzzer is provided. Cable with minimum of 24AWG wires
should be used.
Pin #
Wire
Signal
Description
1
Red
Vin
Power supply input, 5Vdc or 12Vdc, Model dependent
2
Green
/Data (Mag) or /
Data 0 (Wieg)
Reader data output
3
White
/Clock (Mag) or /
Data 1 (Wieg)
Reader data output
4
Brown
LED
LED input:
1-wire control:
0V turns on the green LED
5V turns on the red LED
2-wire control: 0V turns on the red LED
5
Orange
Buzzer/LED
Buzzer/LED input:
1-wire control:
0V turns on the buzzer
2-wire control: 0V turns on the green LED
6
Black
Signal Ground
Power supply return, DC ground
Grounding the Reader
To avoid having ESD (electrostatic discharge) interfering with the operation of the reader, the reader casing shall be grounded.
This can be accomplished by tying the mounting bracket to earth ground locally (e.g. grounded conduit).
CAUTION: DO NOT DISCONNECT
KEYPAD WITHOUT DISENGAGING
THE CONNECTOR!
Dip Switch
Slide
Keypad
Connector
Dielectric
Grease
RJ-11 Jack
MODULAR PLUG
6 (BLK) GROUND
5 (ORG) BUZZER
4 (BRN) LED
3 (WHT) DATA 1/CLOCK
2 (GRN) DATA 0/DATA
1 (RED) +5 or +12VDC
depends on model
Highlighted states are
compatible with the
CT5000 or the WRI.
