How can I do termination with PCI-485/2 in Four-wire mode?

[Tung Yang]

I should use 2 or 4 resistors? Whrere should I place Them?

[Chris_Rake]

I would still use termination at both ends of the network; one at the transmitter, the other at the receiver of each pair of signals.

You might get away with a single terminator near the transmitter, but then again you might get away with no termination if your network isn't long.