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Connector Type
RS232 Connectors
RS485 Connectors
Serial - RS-232
Serial - RS-485
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RCS Technology
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Distrubute RS-485 Signals and Power Up to 4000 Feet Away
RCS Technology 8AH485D 8 Channel RS-485 Active Hub
RCS Technology 8AH485D 8 Channel RS-485 Active Hub
8 Channel RS-485 Active Hub
Item# 30048
Price: Normally $189.60 
Hot Deal $152.71
Open Box (Qty:1) $133.09 ea - Add to cart
Free shipping on orders over $175 - See Details


  • Dual inputs, designed for RS232 or RS485 half duplex Input
  • Eight individual RS-485 half duplex output
  • 4000 foot line length per channel
  • Can be daisy-chained for up to 64 channels

Essential Info

If you have devices requiring signal or power that are located up to 4,000 feet away from your CommStar Network Controller (sold separately), there is an answer. Using a new unified host Interface, the 8 Channel RS-485 Hub allows for both an RS-230 and an RS-485 input connection and then distributes signal or power over long runs out to eight separate devices. The advantage of having this product is that the RS-485 signal travels farther, meaning you won't have to spend more money on repeaters couplers or amplifiers. Additionally, the RS-485 line can be daisy chained, instead of being home run wires, so you can cut down on wiring costs.

Important Note: Only 1 RS-232 or RS-485 interface input port can be used at a time; selectable by adjusting the jumper.


What's Included

  • 1x - 8 Channel RS-485 Active Hub
  • 1x - 12VDC, 1A. Transformer
  • More Info

    Other Features
  • Two-wire half-duplex operation
  • Two-wire power screw terminal strips
  • Two-wire data screw terminal strips
  • Two-way RS-232/485 converter
  • 16-device configuration

    Active Hub Channels
    Each channel on the hub is driven by a separate RS485 driver. Each channel can support 128 devices and a maximum line length of 4000 ft. Active transmission control is provided by the hub for outbound messages from the Master input. All channels transmit simultaneously.

    Star Wiring Topology
    The hubs are designed to allow trouble free point to point star wiring topologies, without regard for line length or termination. However, each hub channel can support single device or multi-drop configurations with proper network considerations.

    Network Power
    Network devices may be powered from the hub's 12VDC @ 200mA max. Each channel is protected by a re-settable 200mA fuse. Do not exceed maximum power draw for all devices of 1000mA. Power input to the hub is protected by a re-settable fuse.

    Channel Termination
    Termination resistors (120 Ohm) are generally recommended on line lengths over 100 ft. Each channel has a termination resistor on board. For SINGLE device connection to a channel, a terminating resistor should be on the device end also. For MULTI-DROP connection to a channel, a terminating resistor should be installed on the last device on the line.

    HomeSeer Connection
    Converts RS485 signals to RS232 for use in connecting TR16, TR40, and ZCVX controllers to a HomeSeer system. Only one controller is needed. All thermostats and zone controllers are wired to this hub. The hub then connects to a single RS232 serial port on the HomeSeer computer.

  • Specifications


    Manufacturer:Residential Control Systems
    Manufacturer Product No.:8AH485D
    Inputs:One RS-485 or one RS-232
    Outputs:Eight RS-485
    Power Supply: 12VDC, 1A
    Dimensions:6" x 4" x 1.5"
    Output Voltage Restrictions:200ma; 1000ma total for all channels
    Chanell Line Length:Up to 4000 feet on each channel


    7 Ratings
    5 star: 100%  (7)
    4 star: 0%  (0)
    3 star: 0%  (0)
    2 star: 0%  (0)
    1 star: 0%  (0)
    Average Customer Rating
    (7 customer ratings)
    Share your thoughts with other customers
    SCOTT -- herndon, VA   7/12/2014
    We have been using these for alarm systems for years. They are rock solid and simplify our installs. They are 100% invaluable.
    Scott Napier -- United States   6/11/2014
    We use this for some large scale alarm systems and it is a fantastic piece of hardware. It is rock solid reliable and saves us a ton of headaches from what we were previously using.
    GERARD -- ajax, ON   8/31/2012
    Smarthome delivered very quickly. The RS-485 Hub worked as advertised with my RCS TRS-60. Highly recommended.
    JASON -- rice, MN   7/10/2012
    Works as expected
    MARK -- herndon, VA   2/21/2012
    This device allows us to eliminate 7 other devices when used in it's full capacity. A real money saver.
    ROBERT -- orlando, FL   6/21/2009
    I used this product for multiple security cameras. It worked perfectly. Smarthome was very attentive to my order, and questions.
    LOUIS -- louisville, KY   1/22/2009
    RCS Products are great. Everything works perfert.

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