As a multi-function optical fiber MODEM, UT-277 MODEM supports asynchronous communication interfaces including RS-232, RS-422 and RS-485. UT-277 MODEM is the ideal choice for the connection from remote terminal unit (RTU) to host or controller of supervisory control and data acquisition (SCADA).

Using regular multi-mode optic fiber cables, the effective communication distance of UT-277SM MODEM can reach a maximum of 4KM for multi-mode and 20KM for single-mode respectively at a maximum transmission rate of 460KBPS. The replacement of the previous copper cable with the current optical fiber as transmission media not only eliminates the potential damages to be caused up by lightning strike, surge, electromagnetic interference and other factors under bad environment, but also at the same time saves the equipments investment for protection from lightning strike and surge, etc.