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