RFID with Pic18 + mikroc

HI all , I mange to interface the Wavetrend L-RX201 with PIC18 , now I write simple code in Mikroc to blink LED if the tag is in the area of the RFID receiver and yes it work fine for me , now because it too long RFID receiver I need to blink the LED if the RFID tag near to receiver about 5 meter if it more than 5 meter dont blink the LED , now from the output of the RFID receiver in terminal it give me all hex value , and there is one hex value which is come after this hex (0x23 0x3A 0x33 0x00) which is fixed value if the tag in area of the receiver, after this values , it will me hex value for strength signal of the tag , nearest tag will give me 0xFF(it mean 0 Meter from receiver ID) and far one is 0x00 (it mean more than 50 meter away from receiver) , and I write simple code to mange this thing but still it give always LED far or near the receiver. but !! if the tag not in the area with keep the LED off .... if the vale of the hex more than 0xB4 blick the LED and if it is lower than 0XB4 keep the LED off .... what i need is some one to correct the code for me ... the bidder will have the code ... regards