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I. Product Overview

YT-903 is a stable and reliable 3-way switch state detection and control module that provides the acquisition and conversion of 3-way switch input to RS485 signal output, as well as the control of 3-way relay output function through RS485. The collection and control of remote device on/off status can be achieved through RS485, and the communication protocol adopts Modbus RTU. YT-903 can detect the on/off status of three switches in real-time and convert it into RS485 signal output; With 3-way relay output control (1A 250VAC); Adopting Modbus RTU communication protocol; RS485 communication interface provides 600W surge protection per line; The power supply has good overcurrent and overvoltage protection functions, as well as anti reverse connection protection; Three LED indicators indicate the input or output status of the switch.

II. Performance parameters:
1. Interface characteristics: Compatible with EIA/TIA RS-485 standard.
2. Electrical interface: 2 10 position wiring terminals
3. Transmission medium: twisted pair or shielded twisted pair.
4. Working mode: asynchronous half duplex
5. Working power supply: 9-30V DC/500mA
6. Signal indication: 5 signal indicator lights power supply (PWR), transmit (TD), receive (RD), and 3 IO indicator lights (I/O-1~I/O-3)
7. Transmission rate: 9600-115200 BPS, adjustable.
8. Protection level: RS-485 interface with 600W lightning surge protection per line
9. Transmission distance: 0-1200 meters (115.2K-9.6KBPS)
10: Operating environment: -40 ℃ to 85 ℃, with a relative humidity of 5% to 85%
III.  Product List
1. YT-903 3-way IO controller 1 set
2. 1 standard DC 12V/500mA power supply
3. 2 10PIN wiring terminals
4. 1 software CD
5. 1 product manual

System parameters
RS485 signal control input, 3 dry contact outputs (3 relays)
The highest working voltage at the output end is 220V, 200W
Adopting balanced current transmission with strong anti-interference ability
Adopting data flow automatic control technology to automatically identify and control the direction of data transmission
Adopting Modbus communication protocol (can be defined according to user requirements)
Work environment
Working temperature: -20 ℃ to 60 ℃
Humidity: Relative humidity 5% to 95%
Working power supply
Input power supply: external power supply DC12V
Input current: within 200mA
Mechanical structure
long × wide × Height: 100mm × 72mm × 26mm (DB9)
Shell: Plastic shell
Color: Blue
Weight: 200g