Overview Installation and Setup
This product is designed to provide a convenient high security RF interface to an 1. Select the site for the receiver which allows connection to the wiegand input of the
access control system which recognises the Wiegand 26 bit protocol. The REC-20/21
may operate in one of two modes. access system. This site should be clear of metallic objects as much as possible.
The antenna should be in free air. In the case of the REC-21 being mounted at a
metal gate post, the antenna should be brought clear of the post.
Mode 1:
Note: An external 434Mhz antenna may be connected to the small terminal block in place
of the wire aerial. This connection should be via RG58 50 Ohm co-axial cable. Connect
the centre conductor to “A” and the shield to “G”.
The received signal is decoded into a 26 bit Wiegand number and the output
corresponding to the button pressed on the fob ( 1, 2, 3, 4 ) presents this Information
for input to the access control system. In this mode up to 4 entry/exit points may be
controlled from the one receiver.
2. Connect receiver to a DC power source ( 9-25VDC) and connect the wiegand
Mode 2: outputs of the receiver to the access system.
The received signal is decoded into a 26 bit Wiegand number and output on “BTN 1”.
Each button on the fob increments the user number by one (1). Eg: Fob is programmed
as Site 123 with button 1 on the fob outputting user 456. Button 2 will then be User 457,
button 3 user 458 and button 4 user 459.
3. The REC-20/21 has 3 pins just above the terminal block. This set of pins allows
different configuration of the wiegand outputs to suit different access systems. With
the jumper in the “EXT” position ( default) the D0/D1 lines are not connected to a
voltage source and the internal 5 volt supply is routed through to the terminal marked
“+5V OUT”. This will suit most applications where the access system provides the
voltage source. With the jumper in the “INT” position, the D0/D1 lines are connected
to the internal +5V through 10K Ohm resistors. If the REC-20/21 is not reporting the
correct site/user to the access system then the INT jumper position should
Note: The above modes of operation are determined by the fob programming in the
factory. The REC-20/21 can manage up to 32,000 fobs in an active users database.
Inactive users are automatically deleted. The REC-20/21 will only function with
Microlatch fobs programmed with Wiegand. remedy this. If the REC-20/21 is required to source +5V, but the internal 10K Ohm
resistors are insufficient, then, with the jumper in the “EXT” position resistors may be
wired externally from each D0/D1 terminal to the +5V OUT terminal.
The REC-20/21 has an onboard 4Mb super capacitor backed RAM which manages all
fobs. The super capacitor backup will provide a minimum 24 hours backup in hostile
( high temperature) environments. In normal operating conditions (~ 25 deg C) backup in
excess of 7 days can be expected.
4. Power up the receiver and then press PB1, the PCB switch, three (3) times, holding
down on the third press. After 4 seconds the RED and GREEN LEDs will flash
Red LED = RF together for approximately 15 seconds. This function is clearing the RAM memory.
Connection: Green LED =
Wiegand Out Once the flashing stops the GREEN LED will be lit. Press the switch PB1 once and
the LEDs will extinguish.
Memory Erase PB1 5. The REC-20 is now ready to “LEARN” fobs. Simply press a button on the fob and
Receiver observe the LEDs on the receiver. On the first press the RED LED will light indicating
module
RF reception of a valid signal. Press the same button again and the RED LED will
light as before with/followed by the GREEN LED indicating output of a wiegand
transmission.
6. Repeat step 5 for all required fobs. Note, at no time is it necessary to press PB1 on
the receiver. Learning requires simply two (2) button presses from a compatible fob.
Wiegand Data
D0 to access
9-25VDCIN D1 system 7. Test operation.
