#include <SERIAL.bas>                    ' source in /Program Files/Coridium/BASIClib

SUB TXD(pin, ch)

TXD (pin, ch) will send a single byte of data that is shifted out as an asynchronous serial stream on pin.  This function is similar to SEROUT,  but is a more efficient implementation.  The baudrate for the pin should be set before using TXD, that is done using the BAUD(pin) array.

TXD will transmit 0-255 as a single byte of data with an added START bit and trailing STOP bit.  As this function is done by the CPU (often referred to as bit-banging, the program will stay at this instruction until the shifting is completed. So the processor is consumed during these operations.  Interupts are also disabled during each byte for these operations. 

DIM A$(10)
BAUD(2) = 19200      ' set the baud rate for serial I/O on pin 2

...

A$ = "Hello World"
GOSUB PRINTSTR

...



' Send a string of characters serially out pin 2
PRINTSTR:
    I=0
    WHILE A$(I)
        TXD(2,A$(I))
        I=I+1
    LOOP

    RETURN

• no equivalent in Visual BASIC
• SEROUT in PBASIC

• BAUD
• RXD
• SEROUT