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RS485 RS422 RS232 Fiber Optical Modem

Shenzhen Nufiber Systems Technology Co., Ltd.
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RS485 RS422 RS232 Fiber Optical Modem

Brand Name : Nufiber

Model Number : GM168SM-F20A/B

Certification : CE

Place of Origin : Shenzhen, China ( mainland)

MOQ : 1 pair

Payment Terms : T/T, Western Union, credit card

Supply Ability : 10000 pairs per month

Delivery Time : 1-3 working days after payment

Packaging Details : Carton packaging, the products are packed in international standard. Each carton is lined with a polythene sheet, thus preventing the cartons from dampness

Fiber Type : SM Bidi

Distance : 20km

Interface : RS232/422/485

Fiber Connector : ST/SC.FC

Warranty : 3 years

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Serial to Fiber Converter RS485/422/232 Fiber Modem SM Bidi 20km GM168SM-F20A/B


Model 168 is a sort of more function and economy RS-232/485/422 interface optic fiber MODEM. It is the best choice to connect RTU to HOST or SCADA controller. It used Optic fiber as transfer medium, increase the transfer function of system. Communication equipment abstain menace effective to lightning strike, surge, electromagnetism disturb under the scurviness environment.

Function and Characteristic

a) Support RS-232/RS-485/RS-422 interface
b) Asynchronous, point to point, rate up to 120Kbps
c) Support 9V~40V DC Volt input, consumption 2W
d) 1500W surge protection, 15KV static protection
e) RS-485/422 port support 32 node ( can choice hand-tailor 128 Node)
f) Working wavelength: 1310nm
g) Auto test signal rate, zero delay auto transmit

Performance guideline

Interface: support EIARS-232, 485, 422 standard
Rate: 0-500Kbps
Transmit distance: RS-232 port 15m, RS-485/422 port 1500m, optical port multi-mode 2KM, single-mode 20KM
Working environment: 0℃ to 60℃

Appearance guideline

Interface type: 8 bit terminal block, multi-mode choice ST/SC/FC interface, single-mode choice FC/SC/ST interface
L*W*H: 100mm*69mm*22mm
Shell: Iron
Color: White
Weight: 230g

Pin define

Power interface
GND --------- Ground
DCIN --------- 9-40V input
Optical fiber interface
IN --------- Optical fiber input
OUT --------- Optical fiber output
RS-485/422 port
T+/D+ --------- RS-422 Send +/ RS-485 +
T-/D- --------- RS-422 Send -/ RS-485-
R+ --------- RS-422 Received +
R- -------- RS-422 Received –
GND --------- Ground
RS-232 port
IN --------- RS-232 input
OUT --------- RS-232 output
GND --------- Ground

Indicator light explain

Power: Power indication
RxD: Optical fiber interface receive indication
TxD: Optical fiber interface send indication


Products show

Ordering information

Model No.



RS232/485/422 TO FIBER,Multimode dual


RS232/485/422 TO FIBER,Single mode dual fiber,20KM,SC


RS232/485/422 TO FIBER,Single mode dual fiber,40KM,SC


RS232/485/422 TO FIBER,Single mode single fiber,20KM,SC


RS232/485/422 TO FIBER,Single mode single fiber,40KM,SC

Packaging and shipping

Product Tags:

RS232 Fiber Optical Modem


RS485 Fiber Optical Modem


Nufiber Fiber Optical Modem

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