GP20 DATASHEET OVERVIEW
GP20 DATASHEET
OVERVIEW
The GP20 is a high performance proximity reader featuring long range and small dimensions. The unit will run from
any voltage from 5 to 13.5vdc. The GP20 features high read range at voltages as low as 5 volts making it ideally
suited to a wide variety of applications, particularly access control.
SPECIFICATIONS
Power Requirements:
5-13.5 volt regulated DC. at 65 mA typical with a 12v
supply. A linear regulator is recommended.
Interface
Wiegand, Magstripe, 9.6K Baud Serial ASCII (RS232) or special to
customer specifications.
Typical Max Read Range
13cm at 13.5v and 20 cm at 5v with ISO card in ideal conditions.
Frequency:
125KHz standard (134.2KHz to special order).
Transponder
Read Only.
Audio/Visual Indication
Internal LED and Buzzer
Operation Temp:
- 10oC ~ +60 oC
Dimensions:
7.8 x 4.3 x 1.5 cm
Interface Cable:
90cm
OUTPUT ASSIGNMENT
Red
Power 5-13.5 Volt
Black
Power 0 Volt
White
Clock Output (Magstripe , Wiegand1) 4K7 pull up
Green
Data Output (RS232, Magstripe & Wiegand0) 4K7 pull up
Orange
Card Present Output 4K7 pull up
Yellow
Program Input 4K7 pull up
Blue
External Beep. Positive Logic 5V on.
Brown
LED (External source).
This datasheet applies to GP20 Rev 1.41
Page 1 of 3
OUTPUT FORMAT
The output format can be customer programmed. The available formats are Wiegand,
Magnetic Emulation, Clock Data and Serial ASCII (RS232):
Wiegand
Magstripe
Serial ASCII (RS232)
Red
Power +V
Red
Power +V
Red
Power +V
Black
Ground 0v
Black
Ground 0v
Black
Ground 0v
White
Data1
Green
Data
Green
Tx Data
Green
Data0
White
Clock (Strobe)
Yellow
No connection
Yellow
connect to White (Data0,
Clock output)
Orange Card Present
Yellow
Connect to Orange
DATA STRUCTURE (SERIAL ASCII)
Baud Rate: 9600, N, 8,1
STX(02 HEX)
DATA
CR
LF
ETX (03 HEX)
The start character is factory defined as an 'STX' (02 HEX). The CR\LF characters serve to bring the received screen
text back to the left hand side and on the line below after the data bytes have been sent. The 'ETX ' (03 HEX)
character denotes the end of the current transmission.
DATA STRUCTURE (MAG STRIPE EMULATION ABA TRACK 2)
Speed : Simulated to 40 IPS (Inch per second)
10 LEADING ZEROS
SS
DATA
ES
LRC
10 TRAILING ZEROS
The leading zeros prepare the receiving unit to accept the data. SS is the Start Sentinel consisting of 11010. ES is the
End Sentinel consisting of 11111. LRC is the Longitudinal Redundancy Check character. Lastly there follows trailing
zeros.
This datasheet applies to GP20 Rev 1.41
Page 2 of 3
PROGRAMMING THE OUTPUT FORM AT
The programming input may be connected in the following ways to choose between the available output formats.
1) Serial ASCII
Leave Program Input Open Circuit
2) Wiegand
Connect Program Input to Clock Output
3) Clock Data**
Connect Program Input to Data Output
4) Magnetic Emulation
Connect Program Input to Card Present
5) Customer Interface **
Connect to Zero Volts
**(to special order only. Minimum 1k pieces)
ENVIRONMENTAL ADJUSTMENT
If the reader is fixed onto a metal surface capacitors may be attached to the orange and yellow cable pair exiting
the back of the reader to readjust the tuning.
About CoreRFID
Contact us at:
CoreRFID Ltd, Dallam Court, Dallam Lane, Warrington, U.K. WA2 7LT
T: +44 (0) 845 071 0985
F: +44 (0) 845 071 0989
This datasheet applies to GP20 Rev 1.41
W: www.corerfid.com E: sales@corerfid.com
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