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I. Product Introduction
The YT-577SM single mode fiber to RS-232/485/422 converter has the characteristics of small size, convenient and flexible use. This product breaks through the contradiction between traditional RS-232/422/485 interface communication distance and communication speed, and also solves the problems of electromagnetic interference, ground loop interference, and lightning damage, greatly improving the reliability, security, and confidentiality of data communication. It can be widely used in various industrial control, process control, traffic control, and other occasions, especially suitable for banks, power plants, and departments and systems with special requirements for electromagnetic interference environments.

Widely used in industries such as military control, industrial automation, traffic control, video control, distributed data acquisition systems, power acquisition and control systems, intelligent residential areas, and highway toll systems.

II. Product Features
1. Transmission rate: 300-115.2Kbps adaptive
2. Transmission distance: single mode 20KM, multi mode 2KM
3. Optical connector: SC/FC/ST
4. Interface terminal: standard industrial crimping terminal
5. Power supply: external 9-30VDC power supply
6. Boundary dimension: 119 × eighty-five × 26mm
7. Working temperature: -40 ℃ to+85 ℃
8. Relative humidity: 5-95%
9. Sending and receiving signals with LED indicator lights
10. Can construct network topology structures such as stars and chains
11. Pure hardware Optical module, zero delay in signal transmission, transparent communication, and plug and play without any debugging
12. Integrated optical transceiver module, stable and reliable output optical power
13. Unique serial port protection circuit, with electric plug and unplug capability
14. Fully insulated at both ends of the transmission to resist electromagnetic interference, ground loop interference, and lightning damage
15. All surface mount processes, industrial grade design, SMT machine assembly line production
III.  Product List
1. YT-577 RS232/485/422 signal fiber optic transceiver 1
2. 1 12v/500mA DC power supply
3. 1 product manual

System parameters
Interface: Compliant with EIA RS-232, RS-485 standards
RS-232 signals: TX, RX, GND
RS-485 signal: T/R+, T/R-
RS-422 signals: T/R+, T/R -, R+, R-
Working mode: Supports asynchronous transmission, point-to-point or multipoint, 2-wire half duplex
Baud: 300 ～ 115.2Kbps, automatic detection of serial port signal rate
Direction control: automatic discrimination and control of data transmission direction
Transmission distance: multimode 2km, single mode 20km
Lightning protection: RS-485/422 output provides 1500W of lightning protection
Indicator light: Equipped with power and data flow indicators, which can be used to determine the type of fault.
Static electricity protection: 15KV static electricity protection
Work environment
Working temperature: -40 ℃ to+85 ℃
Humidity: Relative humidity 5% to 95%
Working power supply
Input power supply: 12V external DC power supply (standard 220V to DC12V power supply)
Power consumption: Static power consumption within 100mA, average dynamic power consumption within 200mA
Mechanical structure
long × wide × Height: 119mmX85mmX26mm
Shell: aluminum shell
Color: Silver
Weight: 150g