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I. Product Introduction
YT-311 is an RS232 serial port 3-wire optoelectronic isolator that adopts advanced optoelectronic isolation technology, greatly protecting RS232 serial interface devices from damage caused by harsh environments such as ground circuit voltage, surges, induced lightning strikes, static electricity, and hot swapping. The damage to the RS232 interface is caused by the hardware of communication equipment, and more than 90% of the reasons are due to the damage to the RS232 equipment caused by harsh environments such as equipment at both ends not being grounded, various surges, induced lightning strikes, static interference, hot swapping, and electromagnetic interference. For example, device A and device B are connected using an RS232 interface. If there is a voltage difference greater than 50V (often exceeding 100V) between the ground wires between A and B, RS232 communication will be abnormal. The RS232 optical isolator can resist the instantaneous voltage difference of 2500V between the input and output ends, a continuous peak voltage difference of 500VDC, and can effectively absorb static electricity and various electromagnetic interference, protecting the RS232 interface of important equipment.
Due to the use of optoelectronic isolation technology, the electrical and ground circuits of the RS-232 devices at both ends are completely isolated, allowing the electrical signal on one side to be converted into an optical signal and then transmitted back to the other, thereby protecting the communication equipment from interference and damage caused by power ground circuit surges, significantly improving the reliability and stability of the communication system.

YT-311 products have been widely used in point-to-point RS232 communication system, UNIX multi-user system, monitoring and control system, Stored program control billing terminal, satellite receiver, ATM and other fields in power, insurance, telecommunications, railway, post office, finance, banking, securities, program control and other industries.

II.  Product parameters
1. The interface complies with EIA RS-232 and CCITT V.24 asynchronous protocols
2. DB9 serial port 3-wire optical isolation (TXD, RXD, GND), using DB9 connectors on both sides of the connector
3. Transmission mode: asynchronous full duplex, fully transparent
4. Isolation voltage 2500Vrms pulse or 500VDC continuous
5. Transmission rate 300BPS-115200BPS
6. Working voltage: Power is obtained through the device serial port, without the need for external power supply
7. Boundary dimension: 62.5mm × 33mm × 16.5mm
8. Weight: 50g
9. Operating environment temperature: -40 ℃ to 85 ℃, relative humidity: 5% to 95%
III. Product List
1. YT-311 passive RS232 photoelectric isolator 1 set
2. 1 product manual

System parameters
Interface: Compliant with EIA RS-232 standard
DB9 serial port 3-wire optical isolation
Baud: 300 ～ 115.2Kbps, automatic detection of serial port signal rate
Direction control: automatic discrimination and control of data transmission direction
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: Automatically draws power from the serial port of the connected device, without the need for external power supply
Power consumption: Static power consumption within 15mA, dynamic power consumption average within 20mA
Mechanical structure
long × wide × Height: 62.5mm x 33mm x 16.5mm
Shell: ABS plastic material
Color: Black
Weight: 50g