Model Number: NT-277M Brand Name: N-NET Key Specifications/Special Features: Key feature:* Zero-delay automatic forwarding* Supporting three types of interfaces: RS-232/485/422* Automatic detection of serial port rate judgment and control of data transmission direction* Working wavelength: 850nm (multi-mode): 1310nm (single mode)* Maximum communication rate:* Optional optical interfaces: SC/ST/FC* Up to 2 kilometers in multi-mode transmission and up to 40 kilometers in single mode transmission* Broad voltage inputs: 5-40V DC or 85-265VAC* Interface supports 1500W surge protection and 15KV ESD protection* External power supply

Parameter	Specifications
Standard	In compliance with EIA RS-232 and RS-485 standards
RS232 signal	IN, out, GND
RS-485 signal	D+, D-, GND
RS-422 signal	R+, R-, T+, T-, GND
Fiber Signal	IN, out
Working mode	Asynchronous working mode, point-to-point
Direction control	Adopting automatic data flow control technology, supporting automatic judgment and control of data transmission direction
Baud rate	0-500Kbps,automatic detection of signal rate
Fiber wavelength	Multi-mode: 850nm;single mode:1310nm
Transmission distance of electrical interface	RS-232 interface: 15 meters: RS-485/422 interface:1200 meters
Transmission distance of optical interface	Multi-mode: 2km; single mode: 20km
Load capacity	RS-485/422 interface supports 32 nodes (128 nodes customizable
Interface protection	600W surge protection,1500V ESD protection
Data interface	8-pin connector or DB9
Maintaining temperature	-40℃ to 85℃
Maintaining temperature	-40℃ to 85℃
Humidity	5%-95%RH
Input power	12V input
Power Consumption	2W