No se puede escribir a USART en PIC18F26J50

No puedo escribir a USART en PIC18F26J50. Aquí está mi configuración:

1. El reloj es de 48MHz;
2. Estoy usando un controlador RS485 (SN65HVD1781) en modo semidúplex. El PIN de dirección para esto está conectado a RA2;
3. Estoy usando un convertidor de USB a RS485 que obtuve de eBay. Tiene un chip FT232R y un transceptor 485;
4. El compilador es C18 v3.47. Intentando obtener 115200bps, 8N1;

5. Aquí está el programa que estoy usando:

   #define RS485_READ 1
   #define RS485_WRITE 0
   
   PRIVATE high8( BYTE x )
   {
       return (BYTE)( x >> 8 );
   }
   
   PRIVATE low8( BYTE x )
   {
       return (BYTE)( x & 0xFF );
   }
   
   void main (void)
   {
   
       (VOID)clockInit(); 
   
       // disables analog-to-digital conversion
       // (enables digital IO on all AD pins)
       ANCON0 = 0x1F;
       ANCON1 = 0x1F; 
   
       // enables rs485 write (output)
       TRISAbits.TRISA2 = 0;
   
       TXSTA1bits.SYNC = 0; 
       TXSTA1bits.BRGH = 1; // set BRGH bit
       TXSTA1bits.TXEN = 1; // enable TX
   
       RCSTA1bits.SPEN = 1;
       RCSTA1bits.CREN = 1;
   
       TRISCbits.TRISC6 = 0; 
       TRISCbits.TRISC7 = 1; // Rx1 set input
   
       BAUDCON1bits.BRG16 = 1; // set 16 bits SPBRG
       BAUDCON1bits.RCIDL = 1; // set receive active
   
       SPBRGH1 = high8(104); // set UART speed SPBRGH
       SPBRG1 = low8(104); // set UART speed SPBRGL 
   
       CM1CONbits.CON = 0; // disables comparator
   
   
      /* Loop forever */
      while (1)
      {
          LATAbits.LATA2 = RS485_WRITE;
   
          while( !TXSTA1bits.TRMT ); // Ready ?
          TXREG1 = 0x55; // yes, send char 
   
          LATAbits.LATA2 = RS485_READ; 
      } 
   }
   

Aquí están los fusebits que estoy usando:

    // CONFIG1L
    #pragma config WDTEN = OFF // Watchdog Timer (disabled)
    #pragma config PLLDIV = 2 // PLL Prescaler Selection bits (Divide by 2 (8 MHz internal oscillator input))
    #pragma config STVREN = ON // Stack Overflow/Underflow Reset (Enabled)
    #pragma config XINST = OFF // Extended Instruction Set (Enabled)

    // CONFIG1H
    #pragma config CPUDIV = OSC1 // CPU System Clock Postscaler (CPU system clock divide by 2)
    #pragma config CP0 = OFF // Code Protect (Program memory is not code-protected)

    // CONFIG2L
    #pragma config OSC = INTOSCPLL // Oscillator (INTOSCPLL)
    #pragma config T1DIG = OFF // T1OSCEN Enforcement (Secondary Oscillator clock source may be selected)
    #pragma config LPT1OSC = OFF // Low-Power Timer1 Oscillator (High-power operation)
    #pragma config FCMEN = OFF // Fail-Safe Clock Monitor (Enabled)
    #pragma config IESO = OFF // Internal External Oscillator Switch Over Mode (Enabled)

    // CONFIG2H
    #pragma config WDTPS = 32768 // Watchdog Postscaler (1:32768)

    // CONFIG3L
    #pragma config DSWDTOSC = INTOSCREF // DSWDT Clock Select (DSWDT uses INTRC)
    #pragma config RTCOSC = T1OSCREF // RTCC Clock Select (RTCC uses T1OSC/T1CKI)
    #pragma config DSBOREN = OFF // Deep Sleep BOR (Enabled)
    #pragma config DSWDTEN = OFF // Deep Sleep Watchdog Timer (Enabled)
    #pragma config DSWDTPS = G2 // Deep Sleep Watchdog Postscaler (1:2,147,483,648 (25.7 days))

    // CONFIG3H
    #pragma config IOL1WAY = OFF // IOLOCK One-Way Set Enable bit (The IOLOCK bit (PPSCON<0>) can be set/cleared as needed)
    #pragma config MSSP7B_EN = MSK7 // MSSP address masking (7 Bit address masking mode)

    // CONFIG4L
    #pragma config WPFP = PAGE_63 // Write/Erase Protect Page Start/End Location (Write Protect Program Flash Page 63)
    #pragma config WPEND = PAGE_WPFP // Write/Erase Protect Region Select (valid when WPDIS = 0) (Page WPFP<5:0> through Configuration Words erase/write protected)
    #pragma config WPCFG = OFF // Write/Erase Protect Configuration Region (Configuration Words page not erase/write-protected)

    // CONFIG4H
    #pragma config WPDIS = OFF // Write Protect Disable bit (WPFP<5:0>/WPEND region ignored)

Y aquí está la función clockInit:

INT16 clockInit( VOID )
{
INT16 rc = ERROR_VALUE_NOT_INITIALIZED;

// disables reference oscillator output
REFOCONbits.ROON = 0;

// device enters IDLE mode on SLEEP instruction
OSCCONbits.IDLEN = 1; 
// system clock is from primary oscillator
OSCCONbits.SCS = 0; 
// selects base frequency as 8MHz
OSCCONbits.IRCF = IOF_8MHz; 
// wait until oscillator is running
while( !OSCCONbits.OSTS );

// low speed USB (6MHz clock)
UCFGbits.FSEN = 0; 

// enable PLL
OSCTUNEbits.PLLEN = 1;


rc = ERROR_SUCCESS;
return rc;
}

¿Puede alguien señalarme lo que estoy haciendo mal?