Simple RS-485 interface Raffi Krikorian December 8, 2002 This board demonstrates the simple interface between a PIC16F876 and a LTC1480 line driver to allow a PIC to talk over a 485 connection to other devices. The button just is there as an input to spur the PIC to send something; in normal operation the PIC will flash its LEDs as bytes come in. This is basically the exact same board as the simple RS-232 board, except that since RS-485 is done on a single conceptual transmit wire, we need to also have a pin connected from the PIC to the LTC1480 to switch it back and forth from receive mode to transmit mode. Parts List (with Digikey part number and approx price as of publication date) of the integrated components. Capacitors, resistors and connectors are not included in this list: 1 PIC16F876-20 microcontrollers PIC16F8760-20/SO-ND -- ~ $9/each 1 LTC1480 RS-485 transceiver LTC1480IS8-ND -- ~ $6.50/each Files: simple485.pdf- A PDF of the schematic for the board DK_MICROCONTROLLER.OLD simple485.DBK simple485.DSN simple485.opj- OrCAD capture files for the schematic simple485.asm- PIC16F876 assembly code for the PIC