Mercury Security © 2013 MR10/20 DOC 10107-0000 REV 2.01 Page 4
10.Keypad Data and Tamper Monitor Signaling:
In the standard mode, keypad data and tamper monitor status are transmitted on the data lines as 8-bit
blocks of ASCII data. They are encoded and sent using the same signaling method as selected for the
card data output (clock/data or data 1/data 0). In the 8-bit mode, the keypad data sent is the 4-bit key
code and its 4-bit compliment.
S3 settings:
Set to ON. Reserved for future use.
Set to ON. Reserved for future use.
Set to ON. Reserved for future use.
Standard mode, 8-bit ASCII
8-bit mode, 4-bit key code and its 4-bit compliment
11.Reader Verification:
The reader performs a self-test when power is first applied to the unit. If power-on test is successfully
completed, the reader will turn on both LEDs for approximately 1 second and sound the buzzer for 1 short
beep. Then the reader is ready for normal operation.
If further verification of the reader hardware is needed, the reader may be temporarily set to format 15.
With this format selected, the reader will read and verify standard ANSI track 2 encoded card. If no read
error is detected, the green LED will flash. Otherwise, the red LED will flash and the buzzer will sound
two short beeps to indicate an error. The LED input can be used to verify the LED function; and the
buzzer input for the buzzer function. For the MR20, the reader will echo a key press with a brief flash of
both LEDs and a short beep of the buzzer. Reset to the required format for normal operation after test.
12.Maintenance:
The readers are designed to provide continuous service with minimal routine maintenance. However,
contaminants (such as magnetic oxides from badges and dirt) tend to accumulate on the read head.
Without regular cleaning, these contaminants will shorten the read head life and increase the probability
of card read error. A maintenance schedule should be developed base on the card reader environment
(dirty or clean) and the usage frequency (light traffic or heavy traffic). Extreme case may require daily
cleaning.
Head cleaning may be done by using a disposable, pre-saturated magnetic head cleaning card. These
cards are readily obtainable from office supply distributors.
The reader exterior surface is covered with high strength polymer and polyester membrane. It may be
cleaned with a soft cloth and mild detergent if required.
13.Specifications:
The reader is for use in low voltage, class 2 circuits only.
Power: Voltage: 5Volt Model: 5.8 Vdc (4.9 to 6.4 Vdc)
12Volt Model: 12 Vdc (10.2 to 13.8 Vdc)
Current: 50mA (25mA typical)
Data output: data 1/data 0 or clock/data
Timing: clock/data: period 1mS
setup/hold time 400uS, clock pulse width 200uS
typical
data 1/data 0: period, 3mS for Wiegand data, 1mS for mag stripe
data pulse width 50uS typical
