Reply To: Questions about moving from HAI OmniStat to Aprilaire 88xx

M1 Support Forum Questions about moving from HAI OmniStat to Aprilaire 88xx Reply To: Questions about moving from HAI OmniStat to Aprilaire 88xx

#6522
Moshe Katz

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I don’t know if the 8811 is required, but I assume it’s doing some RS485 “translations”.
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I did some more research, and I found out why it’s needed. The RS485 terminals on the M1XSP are 2-wire half-duplex, but the Aprilaire system uses 4-wire full-duplex communication.

A number of people on other forums say that any generic RS485/RS422 to RS232 converter will work, not just the Aprilaire 8811. I ordered a cheap generic one, and I’m going to test it out.

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