Black Box ICD102A serial converter/repeater/isolator RS-422/485 Gray

Act as repeaters, isolators, and extenders.
The RS-422/RS-485 model isolates RS-422/485 equipment, features selectable rates between 2400 bps and 115.2 kbps, and enables a system to exceed 32-node limitations.
The RS-232 model isolates the TD, RD, RTS, and CTS channels, supports 115.2-kbps speeds on all four channels, and extends the RS-232 signal beyond 50 feet (15.2 m).