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RS485 Bus Extender


YS-485E bus expander is customized according to market demand a RS485 bus agent. Different from the common market RS485 hub (also known as RS-485 bus split focus, RS-485HUB), YS-485E bus extender with 4 physical serial CPU data exchanges between different serial software. Multiple devices at the same time to read and write a 485 port that we often encountere in practical engineering (such as Clou needs multiple computers to copy the same meter while the Sinopec local PLC and the remote computer need to acquire both the CTU data) because the lack of the arbitration mechanism will lead to communication failure . YS-485E bus expander can automatically access the order queue, and the results back to the requesting port. Completely resolve the port conflict of multiple devices to access the same 485.

4 Real Physical Serial Port

YS-485E bus extender with 4 physical serial CPU, each serial port can be individually set the baud rate and communication parameters, independent of the buffer and control unit, to achieve data forwarding between any 485.

Zero-delay RS485 Direction Control

YS-485E bus extender with RS485 hardware zero delays automatic direction control, the practicality of a broader, more reliable communication.

Timer control sub-time

4 independent timers to control the sub-time, full the brightly data transmission, to prevent endless waiting to improve the system real-time.


  • Industrial Automation
  • Smart meter reading system
  • Building Automation Systems

Features and Benefits

- 4 real physical serial port, each individually set parameters, flexible and convenient
- Exclusive market, has been used for large-scale projects, stable and reliable
- Zero delay automatic send and receive direction control
- Transparent, real-time data forwarding
- Functionality according to customer demand

Software Interface

Form Factor Dimensions: 120 x 85 x 26 mm
Weight: 450 g
Serial Interface RS232、RS485、TTL
Serial Communication Parameters Parity: None, Even, Odd, Space, Mark
Data bits: 5, 6, 7, 8
Stop bits: 1, 2
Flow Control: RTS / CTS
Baud rate: 300 bps ~ 230,400 bps (supports non-standard baud rate)
Environmental Limits Operating temperature: -40 ~ 85 °C
Storage Temperature: -65 ~ 150 °C
Ambient Relative Humidity: 5 to 95% (non-condensing)
Power Requirements Power Input: 9 - 22 VDC
Power Consumption: 80 mA@12 VDC max.
Reliability Automatic Reboot Trigger: Built-in WDT (watchdog timer)
Warranty Warranty Period: 5 years