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Thread: Does comport expansion allow more than 3 connections?

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    Join Date
    Oct 2014
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    Does comport expansion allow more than 3 connections?

    I already have 3 things connected to my EasyTouch Comport which I understand is the maximum number. I can't tell if the comport expansion just allows easier wiring or if you can connect more than 3.
    12,000 gallon IG plaster
    Cartridge filter
    Intellifo VS
    EasyTouch Controller
    Pentair SWG

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    Mod Squad Bama Rambler's Avatar
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    Re: Does comport expansion allow more than 3 connections?

    Theoretically you should be able to add more than three devices to the comm port as it's RS-485 protocol. But, Pentair could have limited it in some way to prevent it, though I don't know why they would.

    You could contact them and see what they say, or you could buy the comm port expansion board and try it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Does comport expansion allow more than 3 connections?

    The RS-485 electrical standard specifies that a maximum of 32 drivers and receivers can be put on one 2 wire bus. I think that Pentair does not want you to try and put more than three wires in one of the screw type connectors. I would put a larger wire (22 ga) in the screw terminal and then pigtail the number of wires I wanted onto the 22 ga wire with a small wire nut. RS-485 is protected in terms of short circuit or over current events, so you really cannot damage anything. Hope this helps you.
    38000 Gal, IG, Plaster, 20' x 40' x 10', Attached Raised Spa, Intelliflo VS 3 HP (011018), Pentair Quad DE 60 Filter, Raypak (Rheem) 400,000 BTU (407a low Nox), Easy Touch 8 upgrade, Screenlogic 2 with wireless, IS-4 Spa Side Remote, Stenner 45MPHP10 w/15 gal tank, Intellibrite 5g (3), Dolphin Triton Plus robot with PRO remote, Water Tech Catfish handheld vacuum for spa, TF100 with SpeedStir.

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    Re: Does comport expansion allow more than 3 connections?

    That make sense. The wires from the pump are pretty thick and barely allow the other two small wires in. I'll pigtail it.

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