Motorola Documentation

Philips: Document 1150.PDF, Part: SCC68C198 Product Specification

See also the schematics for this board!

A schematic for a optoisolated RS232 to RS485 converter.
This is not working with my driver, because of disabling the receiver during transmition. To change this connect pin 2 of U4 to GND (pin 5) .

There is also another driver on the net:

Return to RS485 Start Page