The chip’s EUSART manages serial communications and supports an asynchronous mode that is compatible with serial ports on PCs. Like many PICs, the PIC18F4520 has a built-in serial port. Serial Port Hardware I wrote the code in this article for a PIC18F4520 microcontroller. I’ll also show how to use an RS-422 interface to create serial links as long as 4000 ft. The program detects received commands, takes requested actions, and sends responses. This month I’ll show a companion PICBASIC PRO program for a PIC microcontroller. I described a Visual Basic application that sends commands and receives responses from a device connected via a serial port. Last time I showed how to use Visual Basic.NET to transfer data via a PC’s serial ports, including USB virtual COM ports. >Access Serial Ports with PICBASIC Access Serial Ports with PICBASIC This article originally appeared in the May 2008.
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