 #include <SX22Command.h>   // this is the Selectrix Command library
 
 #define LED_PIN  13   // on most Arduinos there is an LED at pin 13
+#define MAX_SX_CHANNEL   109   // do not read values above 110
+              // because FCC does some "strange" multiplexing
 
 SX22b sx;                // library
 SX22Command sxcmd;       // holds command data

void loop() {

	// check selectrix channels for changes
	for (int i = 0; i < 112; i++) {
		byte d = sx.get(i);
		if (oldSx[i] != d) {   // data have changed on SX bus
			oldSx[i] = d;

					|| (inputString[0] == 'R')) { // READ command
				sxcmd.decodeChannel(inputString);
				if (sxcmd.err == COMMAND_OK) {
          int d = sx.get(sxcmd.channel);
					printSXValue(sxcmd.channel, d);   // send value to serial port
					toggleLed();  // 					
				} else {
					Serial.println("ERR");
