UT-2077 is a mini fiber converter which supports asynchronous RS-232. It is the best choice for connecting a remote terminal unit (RTU) to a HOST or a SCADA controller. It supports RS - 232 asynchronous communication protocol. The RS - 232 way supports data (TXD or SD) sending control, thus to improve the ability to adapt to all kinds of software; it also simplifies the control method. UT-2077 supports asynchronous serial communication between a variety of optical fiber connection, the communication distance can reach as far as multimode 2 km, the RS-232 signal transmission rate can be up to 115.2 KBPS. Different standards of the electrical interface can be mixed used. There is no need of external power supply, it adopts the unique "RS-232 charge pump" drive, and get the power by initializing the RS-232 serial port. This converter is with built-in zero delay auto receiving and transmitting conversion and unique I/O circuit auto control data flow direction without any handshake signal (RTS, DTR), thus ensuring the program that written in RS-232 half-duplex mode, and provides excellent EMI/RFT characteristics.   UT-2077 supports two data signals: sending data and receiving data. RS-232 is connected through DB9 female interface, and fiber optic connection is connected through two ST interfaces, which is very convenient for disassembly and installation. Multi-mode working distance: 2KM Supports point-to-point or loop(point-to-multipoint) connection Supports RS-232 asynchronous communication protocol Baud rate: 300-115.2Kbps ST fiber interface

UT-2577SM fiber optic modem supports asynchronous RS-232/485/422 communication. It is the best choice to connect remote terminal unit (RTU) with HOST or SCADA controller. It supports RS-232/485/422 asynchronous protocols; it can be mixed and matched to use 2 RS-232, RS-485 or RS-422 ports, and it supports 2 wires (half-duplex) RS-485 and 4 wires (full-duplex) RS-422 mode. The RS-485 mode supports data transmission (TXD or SD) control, this enhance the adaptation to most of the software. Optic fiber MODEM supports lots of optic connection between asynchronous serial ports. It supports 2 asynchronous serial devices to communicate under full-duplex or half-duplex via optic fiber; the communication distance can be as far as 4km at multimode, and 20km at single mode. The fastest transmission rate for RS-232 can be 115.2Kbps, and for RS-485/422 can be 460Kbps. Ports with different electronic standards can be mixed and matched to use; it is without problem to connect RS-232 devices with RS-485/422 devices. This is a good replacement of RS-232 to RS485/422 converter, which with EMI/RFT features. UT-2577SM supports two signal data transmission: transmit and receive data. At the same time, it is with RS-485/422 data transmission auto control circuit; Zero delay conversion; all the serial ports is connected via terminal block. Transmission distance: 20km Point to point or loop circuit (point to multi point) connection Supports RS-232, RS-422, RS-485 asynchronous protocol RS-232, RS-422/485 working at the same time Supports 2 bits (half-duplex) & 4 bits (full-duplex) RS-485 operating mode Transmission rate: 460kbps max With optional SC, FC, ST interface Supports master-slave working mode Slave mode: can be used as Hub

UT-277SM fiber optic modem supports asynchronous RS-232/485/422 communication. It is the best choice to connect remote terminal unit (RTU) with HOST or SCADA controller. It supports RS-232/485/422 asynchronous protocols; it can be mixed and matched to use 2 RS-232, RS-485 or RS-422 ports, and it supports 2 wires (half-duplex) RS-485 and 4 wires (full-duplex) RS-422 mode. The RS-485 mode supports data transmission (TXD or SD) control, this enhance the adaptation to most of the software. Fiber optic MODEM supports lots of optic connection between asynchronous serial ports. It supports 2 asynchronous serial devices to communicate under full-duplex or half-duplex via optic fiber; the communication distance can be as far as 4km at multimode, and 20km at single mode. The fastest transmission rate for RS-232 can be 115.2Kbps, and for RS-485/422 can be 460Kbps. Ports with different electronic standards can be mixed and matched to use; it is without problem to connect RS-232 devices with RS-485/422 devices. This is a good replacement of RS-232 to RS485/422 converter, which with EMI/RFT features. UT-277SM supports two signal data transmission: transmit and receive data. At the same time, it is with RS-485/422 data transmission auto control circuit; Zero delay conversion; all the serial ports is connected via terminal block. Supports point to point (point to multi point) connection Supports RS-232,RS-422,RS-485 protocol RS-232, RS-485/422 working at the same time Supports 2 bits (half-duplex) & 4 bits (full-duplex) RS485 operating mode Transmission rate: 460kbps Interface: with optional SC, FC, ST Supports master-slave mode Slave mode: can be worked as Hub