UT-2278SM/ MM, RS-232 / RS-485 / RS-422 Single-mode / Multi-mode Fiber to Serial Converter

Delivery Time:In 7 working days
Certification:CE,FCC,ROHS

UT-2278SM/ MM, RS-232 / RS-485 / RS-422 Single-mode / Multi-mode Fiber to Serial Converter

Description:

Being a multi-function fiber modem in support of asynchronism RS-232, RS-488 and RS-422 communication interface, UT-2278 is the best choice for the connection from remote terminal unit (RTU) to host (HOST) or Supervisory Control and Data Acquisition (SCADA). It supports multiple asynchronism communication protocols including RS-232, RS-485 and RS-422, and it also supports a combination of two of the RS-232, RS-485 or RS-422 interfaces as well as both of the working modes, i.e. two-line (half-duplex) RS-485 and four-line (full duplex) RS-422. The ability to support RS-485 mode for data TXD or SD sending control greatly improves its compatibility with various kinds of software besides a sharp simplification of control method. Various kinds of fiber connection between asynchronism serial interfaces are supported by UT-2278 fiber modem. Both half duplex and full duplex communications through fiber between two asynchronism interface devices are supported with a communication distance as far as 4 kilometers for multi-mode and 20 kilometers for single-mode. The transmission rate for RS-232 can reach a maximum of 115.2KBPS, while for RS-485/RS-422 a maximum of 460KBPS can be achieved. Interfaces of different electric standards can be mixed for use with nice EM/RFT performance, e.g. RS-232 devices can be connected to RS-485/RS-422 devices, and the interface converter or photoelectric isolator can be replaced from RS-232 to RS-485. Two data signal transmissions are supported by UT-2278: data sending and data receiving. At the same time, automatic control circuit is also provided for Rs-485/RS-422 data transmission. Zero delay for converting time is achieved. ST interfaces are used for fiber connection.

 

Specifications:

Interface	Supports RS-232/RS-485/RS-422 interfaces.
Asychronic transmission	Point-to-point with a rate as high as 460KBPS
Transmission distance	4,000 meters for multi-mode and 20,000 meters for single-mode
Working temperature	-40℃ to +80℃, relative humidity from 5% to 95%
Working wave length	1310nm(multi-mode) and 1310nm(single-mode)
Electric interfaces	RS-232: pole-shaped connector RS-485/RS-422: pole-shaped connector
Fiber interface	ST interface(SC/FC can be customed)
RS-232 interface features	Standard RS-232 three line interface ±15KV(anti-static), ESD protection,  maximum rate of 115.2KBPS Input voltage AC100-24V/1W
RS-485/RS-422 interface features	Self-adaptive interface technology enables the self adaptation  of rate regulation from interface, no switch needed, and the ±15KV(anti-static) ESD protect supports as much as 32 points of polling. And 600W  surge protection each line for RS-422 and RS-485 interfaces.

Connector and signal 

Connector (PIN)	Signal	RS-422 Full-duplex	RS-485 Half-duplex
1	T/R+	Send(A+)	RS-485(A+)
2	T/R-	Send(B-)	RS-485(B-)
3	RXD +	RXD(A+)	N/C
4	RXD -	RXD(B-)	N/C
5	TXD	RS-232(Send)