Catacomm Corporation
Sdn Bhd

Unit E1-29-6, Block E1,
Dataran Prima, Jalan PJU 1/42,
47301 Petaling Jaya,
Selangor, Malaysia.
+603-7803 8228
+603-7803 8228

4-port/8-port RS-485 hub

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4-port/8-port RS-485 hub Serial Interface Converters Industrial Communication Products AD-Net 4-port/8-port RS-485 hub Serial Interface Converters Industrial Communication Products AD-Net 4-port/8-port RS-485 hub Serial Interface Converters Industrial Communication Products AD-Net
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AN-H-RS485-4(8) is a RS-485 bus split hub specially designed to meet the demand of RS-485 system in complicated electromagnetic field environment. The product supports maximum 115.2KBPS transmission speed. The RS-485 interface has adopted photoelectric isolation technology to ensure safe and credible data communication, and prevent inducing lightning strike and surge to conversion board and devices. The built in photoelectric isolator and 600W surge protection circuit can offer 3500V isolation voltage, effectively inhibit lightning and ESD and prevent lightning strike and common code interference. It has adopted external switch power supply, safe and credible, quite suitable for outdoor engineering application.
In RS-485 working mode, the adopted identification circuit can detect data direction and switch to control it automatically, easily to solve the time lag of RS-485 during receiving and conversion. The transmission distance of RS-485 interface has exceeded 1200 meters with stable performance. It is a data interface conversion product with superexcellent performance and good price and can be widely applied to freeway charge system, road monitoring system and electric power collection system.
AN-H-RS485-4(8) RS-485 HUB offers star type RS-485 bus connection with each port equipped with short/open circuit protection. With 3500V photoelectric isolation, the user can easily improve RS-485 bus structure, split net segment, and enhance communication credibility. When lightning strike or device malfunction occur, the troubled net segment will be isolated to ensure the normal function of others, which has greatly enhanced the credibility of existing RS-485 network and effectively shorted network maintaining time. Reasonable use of AN-H-RS485-4(8) RS-485 HUB can help you design a unique and highly credible RS-485 system.


  • Star topology: offer more flexible RS-485/RS-422 star bus structure with RS-485 interface input/output adopting independent drive modes. Change the original single bus structure into network structure which can greatly enhance the stability for engineering construction and system.
  • Industrial class photoelectric isolation: offer over 3KV of photoelectric isolation to all RS-485 interfaces, and effectively solve the transmission problems caused by outside lightning strike, surge and potential difference.
  • Automatic data direction control: solve data direction problem through hardware, judge and control data transmission direction automatically.
  • Short/open circuit protection: possess RS-485 port malfunction alarming function, and can cut off malfunctioned port automatically, which can ensure the isolation of malfunctioned RS-485 PORT connected with it in order to ensure the proper operation of devices in other net segments.


Interface feature: interface is compatible with EIA/TIA  RS-232C, RS- 485 standard
Electric interface: RS-232C interface is RJ-45 socket
RS-485 interface is RJ-45 socket
Transmission media: twisted-pair cable or shielded cable
Working mode: asynchronous half duplex
Signal indication: 2 green signal indication lights indicate TXD, RXD and a red one indicates power
Isolation: isolation voltage 3500VRMS 500VDC sequence
Transmission speed: 115.2K-300 BPS
Protecting grade: RS-232 interface+15KV ESD protection
RS-485 interface 600W lightning strike and surge protection on each line.
Transmission distance: 0-2 kilometers (57600-300BPS)
Size: 140mmx130mmx30mm
Working environment: -25튠to 55íŠ,  5% to 95% relative humidity

Ordering Information

4 ports RS-232/485 bus split hub.
8 ports RS-232/485 bus split hub.


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