I need some help. I need a RS-485 driver to interface between a computerized timing system, and a PIC. It is one-way communication, signals from the RS-485 port need to be read on the PIC. Signals that are sent are just 2 digit numbers.
Doing a search for RS-485 drivers comes up with way too much information for me, I dont know which driver will suit my purposes.
As your PIC will be throwing 5v (ish) signals around;
For recieve ...
The 75176 pin 1 (Rx) will connect directly to the PIC.
The 75176 is wired to permanently recieve everything on the RS485 bus (pin 2 held low)
For transmit ...
Connect to the 75176 pin 4 directly for transmit data. The enable pin (3) can either be taken high for the duration of the transmission or wired high if you never need to recieve.
Programming for the PIC ...
Use any old RS232 routine that suits you !
This 75176 is STATIC SENSITIVE - there is another chip which isn't static sensitive but I forget its number and have had no problem with this IC.