macOS USB serial input from PIC16F690? cant get the tx pin to output and into mac

#include <pic.h>		// Include HITECH CC header file

__CONFIG (INTIO & WDTDIS & PWRTDIS & MCLRDIS & BORDIS & UNPROTECT & IESODIS & FCMDIS ); 

unsigned short delay=50;	// Initialize on/off delay value to 50 msec
int advalue = 0;			// Create A/D storage value and clear it

// FUNCTION PROTOTYPES

void pause( unsigned short msvalue );	// Establish pause routine function before main function
void msecbase( void );					// Establish millisecond base function before main function
void sendserial_twobyte (unsigned char control_number, unsigned char control_data);

// MAIN FUNCTION


main()
{
TRISA =	0b00010111;	// RA0, RA1, RA2, RA4 = ins, others out
TRISB = 0b11111111;	// all PortC I/O set as outs
TRISC = 0b00001111;	// RC0, RC1, RC2, RC3 ins, others outs
ANSEL = 0b11111111;	// Select A/D inputs AN0, AN1, AN2, AN3, AN4, AN5, AN6, AN7
ANSELH =0b00000000; 
ADCON0 =0b00000000;	// left justified					
ADCON1 =0b01010000;	// set ADC clock source and freq
ADON = 1; // Turn on the AD unit
CM1CON0 = 0;	//  Comparator 1 off
CM2CON0 = 0;	//  Coparator 2 off

// ANALOG CHANNEL 1 (AN0)
while(1==1)	
	{
	CHS3 = 0; CHS2 = 0; CHS1 = 0; CHS0 = 1; // set channel AN0	
	pause(delay);  	// delay function		
	GODONE = 1;	// start the A-to-D process 	
	while(GODONE) continue; 
	advalue = ADRESH;// A-to-D result to "advalue"
	sendserial_twobyte (240, advalue);  // send  two bytes
}
// ANALOG CHANNEL 2 (AN1)
while(1==1)	
	{
	CHS3 = 0; CHS2 = 0; CHS1 = 1; CHS0 = 0;
	pause(delay);	
	GODONE = 1;	
	while(GODONE) continue; 
	advalue = ADRESH;
	sendserial_twobyte (240, advalue);
}
//etc

} // end main loop


void pause( unsigned short msvalue )
{
	unsigned short x;					// declare a local variable "x" 	
	for (x=0; x<=msvalue; x++)			//  Loop through a delay equal to msvalue
		{								//  in milliseconds.
		msecbase();						//  Jump to millisec delay routine
		}								// end of for loop
}										// end of pause function

void msecbase(void)
{										// start of msecbase function
	OPTION = 0b00000001;				// set prescaler to TMRO 1:4
	TMR0 = 0xd;							// preset TMRO to overflow on 250 counts
	while(!T0IF);						// stay until TMRO overflow flag equals 1
	T0IF = 0;							// clear the TMR0 overflow flag
}										// end of msecbase function

//*******************************************************
//stransmits advalue and anlog number through to tx pin to USB serial on mac
//*******************************************************
void sendserial_twobyte (unsigned char control_number, unsigned char control_data) // no semicolon!
{	
	while(!TRMT) { }  		// hold if TXREG full (TRMT = 0 when TXREG full, = 1 when empty)
	TXREG = control_number;	// send controller number
	while(!TRMT) { } 		// hold again while TXREG full
	TXREG = control_data;		// send controller data
	
	// this is the bit I cant get into the serial-to-USB converter into the mac...
	
} // end function