Mercury Security Corporation,
©
2008
BR20 Doc. 10107-0024 rev. 1.03 10/2008
Page 2
Information subject to change without notice.
The reader is rated to operate over an extended
temperature range and the electronics are conformal
coated against moisture. If the reader is expected to
be exposed to weather, use the dielectric grease to
coat the field connections. 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.
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.
6. 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
Reader data output
/Data 0 (Wieg)
3
White
/Clock (Mag) or
Reader data output
/Data 1 (Wieg)
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
7. 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).
8. DIP Switch Setting:
The DIP switch on the BR20 reader is used to select a preset format, the functions for the LED and buzzer, and the
output signal format, etc. The preset format determines how the card is interpreted. Refer to the format specification
for detail. The settings are for STANDARD models ONLY. The BR20 does not support the tamper switch option.
MODULAR PLUG
1 (RED) +5 or +12Vdc
2 (GRN) DATA 0/DATA
3 (WHT) DATA 1/CLOCK
4 (BRN) LED
5 (ORG) BUZZER/LED
6 (BLK) GND
depends on model
FORMAT
SW -4
SW -3
SW -2
SW -1
OUTPUT
LED
BUZZER
TAMPER
0
ON
ON
ON
ON
DATA 1/DATA 0 1-W IRE LED
YES
NO
1
ON
ON
ON
OFF
CLOCK/DATA
1-W IRE LED
YES
NO
2
ON
ON
OFF
ON
CLOCK/DATA
1-W IRE LED
YES
YES
3
ON
ON
OFF
OFF
CLOCK/DATA
1-W IRE LED
YES
NO
4
ON
OFF
ON
ON
DATA 1/DATA 0 1-W IRE LED
YES
NO
5
ON
OFF
ON
OFF
DATA 1/DATA 0 1-W IRE LED
YES
NO
6
ON
OFF
OFF
ON
DATA 1/DATA 0 1-W IRE LED
YES
NO
7
ON
OFF
OFF
OFF
DATA 1/DATA 0 1-W IRE LED
YES
NO
12
OFF
OFF
ON
ON
CLOCK/DATA
2-W IRE LED
NO
NO
13
OFF
OFF
ON
OFF
DATA 1/DATA 0 2-W IRE LED
NO
NO
15
OFF
OFF
OFF
OFF
CLOCK/DATA
1-W IRE LED
YES
YES
