 	RDM880.write( CMD, sizeof(CMD)/sizeof(CMD[0]) );
 
 }
+
 /*
 	Function that waits for a control signal to go high and counts time 
 	that control signal is high for.

		  i.e. Block 3, 7 and 11 are sector trailers that contain authentication keys.

*/
void MF_WRITE(unsigned char numBlocks, unsigned char startAddress, unsigned long time) {
	int i = 0;

	// prepare data to be written

void MF_SNR(void) {
	unsigned char A[] = { 0x00, 0x03, CMD_GET_SNR, 0x26, 0x00 };
	unsigned char BCC = checksum( A, sizeof(A)/sizeof(A[0]) );
	unsigned char CMD[] = { STX, 0x00, 0x03, CMD_GET_SNR, 0x26, 0x00, BCC, ETX };
	RDM880.write( CMD, sizeof(CMD)/sizeof(CMD[0]) );
}

