RFID-Receiver SF6107

SF6108 RFID receiver
The special function chip SF6108 is a RFID receiver. It can decode RFID tags in EM-4102 standard (125khz reading frequency and 40 bit data). In each case the chip is sending the decoding ID from every tag to the PC or MC:

stand-alone application (door opener for one master and up to 99 tags)
RS232 PC connection (USB with adaptor) for transferring tag ID to a PC or to a MC (micro controller with TTL-RS232)
after reset immediately RS232-output of the number of all registered tags in the internal memory and it's ID's
RS232-output of the scanned tag id of any tag (whether it is registered in memory or not)
output-high (pin 3) after scanning of a registered tag (relay for door opener)
programmable baud rates (4800-57600), default 9600 8N1
automatic detection whether a PC-RS232 or TTL-RS232 is connected to the device (pull-up or pull-low on pin 4)
one active high output pin (3) for the detection of a registered tag
16 extra output pins (GPIO) are programmable for the first 16 registered tags (tag-1 sets GPIO-1, tag-2 sets GPIO-3.....)
GPIO pins (including 6 AD channels) are setting and reading by RS232
supply voltage 5 Volt (current 20 mA, on PC connection supply voltage from the RS232 port possible, see SF6107 data sheet)
reading distance up to 5 cm
special mode (JP-1) for measuring of the resonance of L1/C5 (per JP1)
distance between electronic and L1 (max. wire length) 80 cm
monitor function with a piezoelectric disk (speaker) on pin 2

Table of RS232 commands

syntax	number of parameters
*R P1	1	Read memory from address P1 (P1=0...511)
*W P1,P2	2	Write memory, value of P2 puts in address P1 (P1=0...511, P2=0....255)
*T	0	Tags, shows the number of registered tags in the memory and it's ID's
*I P1	1	Input, reads digital value on pin P1 (P1=5,6,9-11,14-16,18,19,23-28)
*I 0	1 (P1 ever 0)	Input of all 16 GPIO pins (IO-1...IO-16)
*D P1,P2	2	Direction, set pin P1 for input (P2=0) or output (P2=1)
*D 0,P2	2 (P1 ever 0)	Direction, set all 16 GPIO pins direction with the value of P2
*O P1,P2	2	Output, if the direction of that pin was set to output, pin P1 will be set to the level of P2 (0 or 1), else (pin P1 is an input pin), a pull-up is switch on (P2=1) or off (P2=0)
*O 0,P2	2 (P1 ever 0)	Output of all 16 GPIO pins with the value of P2
*A P1	1	ADC, reads one of 6 AD-channels (P1=23-28, ret value: 0V=0, 5V=1023)
*S P1	1	Setup of diverses functions (accumulated bit value, P1=0...255) Bit-0 = 1: output of 16 GPIO inputs if input at least one bit was changed Bit-1 = 1: output of numbers as decimal, Bit-1 = 0: output as hex Bit-2 = 1: writes a '0x' before all hex values Bit-7 = 1: no output of recognized tag ID , Bit-7 = 0: normal output