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I. Product Overview
YT-309 photoelectric isolation type repeater, compatible with RS-422 and RS-485 standards, can extend the communication distance of RS-422/RS-485 bus network, increase the number of RS-422/RS-485 network devices. The built-in photoelectric isolator and DC/DC isolation module can provide an isolation voltage of up to 2500Vrms, and there are fast transient voltage suppression protectors at both ends of the interface. This protector is designed to protect the RS-422/RS-485 interface, The incoming TVS transient voltage suppressor is used. Under normal conditions, the TVS tube is in a high resistance state. When both ends of the TVS tube are subjected to transient high energy shocks, it can reduce the impedance at both ends at a very high speed, absorb a large current, clamp the voltage at both ends to a predetermined value, and protect the circuit components behind from damage due to transient high voltage shocks. This protector can effectively suppress lightning and ESD, providing a lightning surge protection power of 600W per line, as well as various surge voltages and transient overvoltages generated on the line due to various reasons. The extremely small interpole capacitance ensures high-speed transmission of the RS-422/RS-485 interface. The converter is equipped with zero delay automatic transmission and conversion, and its unique I/O circuit automatically controls the direction of data flow without any handshake signals (such as RTS, DTR, etc.). It does not require jumper settings to achieve full duplex (RS-422) or half duplex (RS-485) mode conversion, plug and play.

The YT-309 photoelectric isolation type relay can provide reliable connections for point-to-point and point-to-multipoint communication. Each relay can connect 128 RS-422 or RS-485 interface devices from point to multipoint, with a data communication rate of 300-115.2KBPS and a power indicator light and data flow indicator light to indicate fault conditions.

II. Performance parameters
1. Interface characteristics: The interface is compatible with EIA/TIA RS-485/RS-422 standards
2. Electrical interface: RS-422/RS-485 input and output terminals adopt DB9 male
Connector for the head. The wiring terminal adopts DB9 female connector.
3. Protection level: 600W per line for RS-422 and RS-485 interfaces at both ends
Lightning surge protection,+/-15KVESD protection.
4. Isolation degree: Isolation voltage 2500Vrms500DC continuous. DC/DC module
5. Working mode: asynchronous half duplex or asynchronous full duplex
6. Signal indication: Three signal indicator lights power supply (PWR), transmission (TXD)
Receive (RXD).
7. Transmission medium: twisted pair or shielded wire
8. Transmission rate: 300BPS-115.2KBPS
9. Boundary dimension: 113mmX55mmX25mm
10. Operating environment: -40 ℃ to 85 ℃, relative humidity of 5% to 95%
11. Transmission distance: 0-5000 meters (115200bps-9600bps)
III. Product List:
1. YT-309 RS485/422 signal repeater 1
2. 1 standard 12V/500mA power supply
3. 1 instruction manual

System parameters
Interface: Compliant with EIA RS-485 and RS-422 standards
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, 4-wire full duplex
Baud: 300 ～ 115.2Kbps, automatic detection of serial port signal rate
Direction control: automatic discrimination and control of data transmission direction
Relay distance: 5000 meters
Lightning protection: RS-485/422 output provides 1200W 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: 9-30V external DC power supply (standard 220V to DC12V/500mA power supply)
Power consumption: Static power consumption within 100mA, average dynamic power consumption within 200mA
Mechanical structure
long × wide × Height: 113mmX55mmX25mm
Shell: Aluminum alloy shell
Color: Silver
Weight: 150g