Usage Examples

(state ? true : false)  //1:0

#define	USART_DIR_TX(state)	(state ? ([true]) : ([false]))

#define OUTPUT_PIN(state) (state ? (LATAbis.LATA1 = 1) : (LATAbis.LATA1 = 0))  //1:0

bytesThisSector = (bytesLeftToWrite > 512) ? 512 : bytesLeftToWrite;

#define LED_OUTPUT_ON(state)				(state ? (rs485_leds_output |= 0x01) : (rs485_leds_output &= ~0x01))

Multiple actions within a ternary operator

You comma seperate them:

#define IO_BUTTONS_COL_1(state)		(state ? (TRISBbits.TRISB1 = 1) : (TRISBbits.TRISB1 = 0, LATBbits.LATB1 = 0))