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4 channel RS232/422/485(providing three type interface) fiber modem

View : 140
Type : Serial Optical Fiber Modem
Description :

This series of devices use FPGA design, providing 4-channel serial port, each port supports RS232 / 422/485 three business interfaces.


This series of devices use FPGA design, providing 4-channel serial port, each port supports RS232 / 422/485 three business interfaces. The device is the best choice of connecting a remote terminal unit (RTU) to a host (HOST) or a distributed data acquisition system (SCADA) controller with high cost performance. Effective transmission distance up to 0-120KM, serial port communication speed up to 0-115.2KBPS.

Adopting optical fiber as transmission medium, it can completely avoid the threats from harsh environments like lightning, surges, electromagnetic interference to communications equipment, and it also eliminates the cost of lighting surge protection devices for using copper as transmission medium. 



Provide 4-channelserial port, each serial port also provides three serial ports RS232/422/485 (interface type can be set by DIP switch) to start the service on-site conveniently ;

It can detect, control RS-485 data flow automatically,no need handshake signal to control data flow;

With the ability to detect serial signal baud rateautomatically;

When there is no optic signal. it candetect automatically the opposite end device is powered off, or the fiber is disconnected , and indicates on the LED;

Racktype device provide network management SNMP;

Serial channel can transmitasynchronous, baud rate from 300-115.2Kbps adaptive serial data;

Serial interface lightning protection to IEC61000-4-5 (10/700μS).Differential mode: 6KV, impedance (2Ω); Common mode: 6KV, impedance (2Ω);


● Fiber          

Number of Fiber Ports:1

Fiber core :Single fiber/dual fiber


Wavelength:850nm/1310nm multi mode;1310nm/1550nm single mode

Transmission distance:20~120Km

Typical output power:

Single mode 1310/1550nm: >-9dBm

Multi-mode 850nm:-18dBm

Multi-mode 1310nm:-25dBm

Receiver Sensitivity: -28dBm~- 40dBm

● Serial port       


EIA/TIA-232 RS-232 (ITU-T V.28)

 EIA/TIA-422 RS-422 (ITU-T V.11)

 EIA/TIA-485 RS-485 (ISO/IEC8284)

Serial interface:

RS-422: TxD+ TxD- RxD+ RxD-

RS-485 4 wires: TxD+ TxD- RxD+ RxD-

RS-485 2 wires: A(TX+) B(TX-) Signal Ground

RS-232: RXD TXD Signal Ground

● Working environment 

Operating temperature: -10 ℃ – +60 ℃

Storage temperature: -40 ℃ – +85 ℃

Humidity: 0% -95% (non-condensing)

MTBF:> 100,000 hours

● Electrical and mechanical feature 

System Power: AC180V~260V;DC–48V;DC+24V

Power consumption:≤5W

Appearance:(L × W × H) 216*138*31mm  Desktop




Product Function Description

Transmit 4-channel serial data simultaneously, each serial port provide RS232/422/485 three type serial interface simultaneously.

Business port description

1 optical port;4 channel serial interface

power supply

AC220V / DC-48V / DC+24V(Power optional)

Product Size

(L × W × H) 216*138*31mm  Desktop


0.75Kg / pc


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