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Topic Title: Home Bus System - ET2101
Topic Summary: Communication protocol used by Japanese A/C manufacturers
Created On: 09 December 2009 04:20 PM
Status: Read Only
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 09 December 2009 04:20 PM
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Posts: 1
Joined: 08 March 2007


I am looking to interface to the 2-wire communications bus (HBS) that is commonly used in A/C equipment. The protocol is described in the following document, but I cannot find it as it is old (1988):

"ET-2101 Home Bus System (HBS)",Standard of EIAJ & REEA, Technical Committee on HBS, 9,1988.

I have found a Mitsumi IC that implements the physical layer, however I still need to implement the HBS protocol in the microcontroller:

If you have knowledge of the HBS protocol, any assistance or insight you could provide would be greatly appreciated.

Chris Childs MIET
 31 July 2012 10:56 AM
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Joined: 31 July 2012

Hi cdchilds,

Ithink that i have the same problem than you, but in my case I have any idea about the physical layer protocol. The data link layer protocol I don't know how it is. Could you help me with my problem?

I know that my frame check secuence hace 8 bits, but I don´t know how to calculate.

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