The Canare TRM-221 Optical Converter (RS-422 / RS-232) is a bi-directional optical converter for RS-422 & RS-232 signals that support TIA-422, SMPTE 207M, and RS-232 standard formats.
Converter used for RS-422 & RS-232 signals
Supports TIA-422, SMPTE 207M, & RS-232 formats
Bi-directional optical interface
Note:
Use TRM-220 and TRM-221 in pairs.
Extends communication range up to 21.13 miles / 34 km (Condition: line loss 0.5 dB/km)