LE-8200A/LE-8200/LE-3500/LE-2500/LE-1500 have a RS-232C port and a RS-422/RS-485 port, thus you do not need any other options to monitor RS-422/RS-485.

You can monitor terminal block, X.21, V.35, and RS-449 by using options.

LE-200PS/LE-150PS have a port by which you can monitor RS-232C/RS-422/RS-485.