Extra long-range RFID (proximity) card reader
GP90A
Extra long-range RFID (proximity) card reader
(1) Features:
•
•
•
•
•
•
•
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Extra long reading range of up to 90 cm with ISO-size passive RFID cards*, over 100 cm
with special “optimized” passive cards
High-precision auto tuning circuitry compensates for environmental changes and
presence of metal objects
Bright LED indicators, tuning LED bar
Four user-selectable interfaces: Magstripe, Wiegand, RS232 and RS485
Internal relay and serial port commands to control it
Firmware upgradeable in the field
Attractive and waterproof housing design
High-quality power supply with noise filter included
(2) Cable wire assignment
The GP90A has two cables: a signal cable (thicker one) and power cable (thinner one of
the two). Cable wiring is shown in the tables below:
Signal Cable
Green
White
Orange
Dark Blue
Brown
Light Blue
Light Green
Yellow
Pink
White w. black stripe
Black
Red
Purple
Gray
Power Cable
White
Black
Shield
Magstripe I/F
Wiegand I/F
Data
Data0
Clock
Data1
Card present
<unused>
RS232, TX
RS232, RX
+RS485
-RS485
I/F selection, see (see section 4)
I/F selection, see (see section 4)
Enable firmware download
Ground
Relay, common
Relay, normally opened
Relay, normally closed
Function
+VDC (19.2V)
Ground
Earth ground
* Measured in a noise-free environment with good-quality RFID cards and in the noise and
metal-free environment
(3) Power supply
The GP90A is powered by a two-stage power circuitry (see figure below): the power
adaptor that transforms 220V AC (110V AC) into 24V DC, and the PS90A power supply that
converts 24V DC into 19.2V DC required by the GP90A. The power supply also filters out the
power line noise and further stabilizes the voltage supplied to the GP90, which is very
important to proper reader operation.
The GP90A should only be powered as described above. Using
any other power arrangement may lead to a decreased reading
range and result in a permanent damage to the GP90A.
Power cable
of GP90A
AC-DC 24V Power Adaptor
PS90A Power Supply & Filter
(4) Interface selection
Data output interface is selected using Yellow and Pink wires:
Interface
Magstripe
Wiegand
RS232
RS485
Yellow wire
Connect to ground
Leave unconnected
Leave unconnected
Connect to ground
Pink wire
Connect to ground
Connect to ground
Leave unconnected
Leave unconnected
(5) LED indicators
The GP90A has status and tuning LEDs (see figure below). Status LED area has blue,
red, and green LEDs:
•
•
•
Blue LED is on whenever the GP90A is powered and ready to read the card
Red LED blinks once when the good read has been achieved. Red LED is also used
during the firmware download (see section 10)
Green LED is only used during the firmware download (see section 10)
GP90
Status LEDs
Tuning LEDs
Tuning LEDs form a light bar that shows current tuning point- see section 7.
(6) Obtaining the best reading range
To obtain advertised reading range use high-quality RFID cards and install the GP90A
in a noise and metal-free environment.
The quality of RFID cards affects the reading range of the GP90A. Poor cards can
reduce the reading distance by as much as 50%. On the other hand, using special “thick”
RFID cards (that contain the coils with a much larger number of turns) can increase the
reading distance to beyond 100-110 cm.
The main frequency of the GP90A is 125KHz. Regular CRT monitors generate noise in
this band and can interfere with the operation of the GP90A. Other 125KHz RFID readers
can affect the reading range of the GP90A even from a distance of several meters! The
GP90A provides a special serial command that can be used to verify current noise level- see
section 9.
Avoiding metal objects means that the GP90A should not be installed on metal
surfaces. Metal grids inside the concrete walls also count. The GP90A includes advanced
auto-tuning circuitry that compensates for the presence of metal (see section 7) but the best
reading range is still obtained in the metal-free environment.
(7) Auto-tuning circuitry
The GP90A is equipped with an advanced auto-tuning circuitry that compensates for the
presence of metal objects in the vicinity of the GP90A and for other environmental factors
(such as temperature variations) that affect the tuning of the GP90A’s internal antenna and
decrease the reading distance. Auto-tuning recovers significant portion of the reading
distance that otherwise would have been lost due to the loss of tuning. The GP90A is
constantly adjusting its tuning to obtain the best reading distance possible under the
circumstances.
The GP90A displays the results of auto-tuning on the tuning LED bar (see section 5).
The bar contains 8 LEDs and displays the light line (“growing” from left to right) that shows
current tuning point. Specific position of the bar does not represent tuning quality- it is the
changes in the tuning point that are of interest.
Before installing the GP90A in its intended location power the reader in a noise and
metal-free environment and note the light bar status. Since all readers are slightly different
(due to internal component variations) the nominal position will not always be the same.
Typically, you will see a bar of four to six LEDs.
After installing the reader at the intended location observe the tuning bar again. If the same number of
LEDs is still on then the installation environment is similar to the one in which you have tested the
reader before. If the light bar is shorter than before, then this indicates a presence of metal in the
vicinity of the reader.
Despite the “efforts” of the auto-tuning circuitry you may not
obtain advertised reading range if the light bar is significantly
shorter (i.e. only 1 or 2 LEDs are on).
(8) Internal relay
The GP90A features an internal relay that can be controlled by sending serial
commands via the RS232 or RS485 interface (see section 9). Relay can be used to control
an electric lock.
(9) Serial commands
All commands are sent to the GP90A via its RS232 or RS485 interfaces. For each
command the GP90A will issue a reply. Serial port settings are 9600, N, 8, 1. Commands and
replies have the following format:
STX(02
h)
Command or reply code (+
data)
Check field
CR(0D
h)
Currently supported commands (with their check field already calculated and shown in
gray) are shown below (without STX and CR):
Switch the relay on (relay enable)
Switch the relay off (relay disable)
Get current noise level
Get firmware version
“RE68”
“RD69”
“NB1”
“VA9”
The GP90A can issue the following replies:
Command acknowledged
Command acknowledged, data returned
Invalid command
•
“ABE”
“AnnnXX”*
“CBC”
Current noise level is returned as a HEX value from 0 to 3FF. If there is no major interference the GP90A
returns the value in the 50-100 range. If the noise is higher than 100 then this will probably affect the
reading range of the GP90A.
(10) Firmware Download Mode
Internal firmware of the GP90A can be upgraded in the field. The download is performed
through the serial port (9600, N, 8, 1). To download a firmware file you’ll need any PC
software that supports an XMODEM communications protocol (checksum version).
Procedures below assume the use of HyperTerminal for Windows:
• Power the GP90A off
• Connect the RS232 port of the GP90A to the COM port of the PC
• Ground the “enable firmware download” wire of the GP90A
• Launch the HyperTerminal and configure it for an appropriate COM port with
communications parameters set to 9600,8,N,1.
• Choose TransferÆ Send file from the Main menu- the Send file dialog will appear
• In the Send file dialog, select the firmware file that you want to download into the GP90A
and choose the Xmodem protocol from the Protocol drop-down box. Click OK when
finished
• Power the GP90A up- the download will begin
• Green status LED of the GP90A will blink during the download
• When the download is finished, disconnect the “enable firmware download” wire from the
ground and switch the GP90A off and back on again
• If, when you power the GP90A up after the download, both Green and Red status LEDs
start blinking rapidly then this means that you have downloaded a wrong file or that the
download process was not completed.
A number of errors can occur during the download. These errors are displayed by the
Red status LED:
1 long “blink”
Communications timeout (check baudrate,
protocol)
Communications error (check baudrate,
protocol)
Invalid data file (check which file you are
downloading)
Hardware failure (this GP90A is
malfunctioning)
1 long + 1 short
“blink”
1 long + 2 short
“blinks”
1 long + 3 short
“blinks”
(11) Data output formats
Magstripe interface, simulated to 38 IPS (inches per second)
10 leading
zeros
SS Data (14
digits)
ES LRC
10 trailing
zeroes
Wiegand interface (26-bit format):
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
P S S S S S S S S C C C C C C
P E E E E E E E E E E E E
O O
Summed for even parity (E)
15 16 17 18 19 20 21 22 23 24 25
C C C C C C C C C C P
O O O O O O O O O O P
Summed for odd parity (O)
P- parity (Even/Odd), S- site bits, C- card data
Serial interface (9600,N,8,1)
STX
(02h)
Data (10x “hex” ASCII
chars)
CR
(0Dh)
LF
(0Ah)
ETX
(03h)
(13) Specifications
Interfaces
Nominal reading range (with highquality ISO-size RFID card in a noise
and metal-free environment)
RFID (proximity) cards accepted
Maximum power switched by internal
relay
Operating temperature range
Dimensions
Packing carton dimensions (carton
includes power adaptor and PS90A
power supply)
Gross packing weight (with power
adaptor and power supply):
Magstripe, Wiegand (24
bits), RS232, RS485
(9600,N,8,1)
~90 cm
125KHz, 64 bits,
Manchester encoding
Up to 24V/2A
-10 ~ +60 Co
420x320x45mm
485x475x100 mm
2.3 kg
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