For those X10 control applications demanding isolated, dry contacts, we offer the latest addition to our product family, the Relay8.
The Relay8 is an 8-relay module that responds to X10 ON, OFF, ALL OFF and status request commands.

The Relay8 supports devices capable of sending a Status Request command. In addition to giving you the power to poll individual relays to determine their on/off status, it also allows your computer send a command to the module then check to see if the command was carried out. If not, the computer can automatically send the command again.