1. Summarize
Model 218 is a sort of more function and economy RS-232 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.

2.Function and Characteristic
a) Support RS-232 interface
b) Asynchronous, point to point, rate up to 120Kbps
c) Support 5V Volt input, +14 or –14V Volt output,consumption 2W
d) .Internal or external power choice.
e) Working wavelength: 850nm(multi-mode)
1310nm(single mode)
f) Auto test signal rate, zero delay auto transmit.

3. Performance guideline
Interface: support EIA RS-232 standard
Rate: 0-120Kbps
Transmit distance: RS-232 port 15m, optical port multi-mode 2KM,
single-mode 20KM
Working environment: -25℃ to 70℃

4. Appearance guideline
Interface type: DB-9 female(RS-232), multi-mode choice ST/ SC/FC
interface, single-mode choice FC/SC/ST interface
L*W*H: 100mm*69mm*22mm


Shell: Iron
Colour: White
Weight: 230g

5. Pin define
Power interface
DCIN —— 5V input
RS-232 port
IN —— RS-232 input
OUT —— RS-232 output
GND —— Ground
Optical fiber interface
IN —— Optical fiber input
OUT —— Optical fiber output

6. Indicator light explain
Power: Power indication
RxD: Optical fiber interface receive indication
TxD: Optical fiber interface send indication