It consists of the following Part Description 2 off coded Key Fobs Each FOB has a unique code 1 Program disc Add or Erase FOB’s 1 Receiver Board Including 125Khz Antenna + LED Pre-programed to accept FOBs supplied. To use, Connect 12V to 14V as follows. With the 8 way connector facing you Connect +12 V to top row 2nd pin from left and top row right hand pin. Connect 0V to top row 3rd pin from left. Outputs, A unique code is created on the 1st pin from left on the top row when a valid Fob is present. Pin 2 of HEROS1 chip is normally 0V. This will rise to +5V when a valid fob is placed near the Antenna. Also Pin 20 of UM3758 is normally 0V. This will rise to +12V when a valid fob is placed near the Antenna. Note, the LED will be permanently on *********************** Modification 1 *********************** Make LED come on only when a valid Fob is present Cut track at point shown on diagram Solder a wire as shown on diagram Now the LED will light if a valid FOB is placed within 3” of Anntenna coil *********************** Modification 2 *********************** Drive 12V Relay, Solenoid or Door Mechanism You will require the following additional components 1 Resistor Suggest 1K 1/4W 2 Diode Suggest 1N4002 3 Transistor Suggest BD237 (NPN) Connect Resistor from Pin 20 of UM3758 to Base of Transistor. Connect Emmiter of Transistor to Ground Connect Collector of Transistor to one end of Relay/Door Mechanism Connect the other end of Relay/Door Mechanism to 12V Connect the Diode across the Relay Cathode to +12V, Anode to Transistor Collector. The above circuit has been tested with the BSTL 210 Door Mechanism available from Gardiner Security (Price 9.75 +VAT) 8 way Connector Data +12V 0V +12V 0 0 0 0 N/C N/C N/C N/C 0 0 0 0 | | ------------------------------------------------------------------------------ | PCB | ------------------------------------------------------------------------------ Adding a Fob to Memory 1. Slowly pass Black disc in front of Antenna, Then move away 2. Slowly pass new FOB in front of Antenna Deleting Fobs from memory 1. Slowly pass Black disc in front of Antenna, Then move away 2. Slowly pass Black disc in front of Antenna again Click rfidmod.jpg for picture of board with connections shown. Please note the different signals available. Data This is a unique serial code created when a Valid Key Fob is presented. The code is unique to the PCB. It is not related to the ID of the tag. To make a Key Fob Valid it should be added to memory as explained in Adding a Fob to Memory. RFID Data This is the Data of the Key Fob. Each Key Fob will produce a different Data Code here. Down load the EM H4102 Data sheet for information on decoding this data. TTL Output This Output goes high only when a Valid Key Fob is near the Antenna. To make a Key Fob Valid it should be added to memory as explained in Adding a Fob to Memory. RS232 Version Click rfidrs232mod.jpg for picture of board with connections shown.