Sirius rs232 control

Hi, I am looking to add another sirius tuner to my home system. I am planning to connect it to my home automation system. I am looking at several older tuner models on eBay - all with rs232 connections. Most have model numbers beginning with SCH. Before I decide on a specific model I would like to get the documentation for the rs232 protocol to ensure I can connect it to my server. Des anyone have the documentation on the rs232 protocol for any of these older models? Thanks.

Did you try going to Barry Gordon's website?
His website is here and he has stuff that might help you http://the-gordons.net/homepage/DownLoad.html

Thanks - that was great.  I actually sent him messages on remotecentral.com - which was the last place I found someone talking about this - but he must not be on there much as I didn't hear back from him.  The protocol document is on his website.

That's great, I knew he had some Sirius stuff in the downloads area. He used to be on the Pronto forums a lot but I found his website from when he posted it in the Command Fusion Google group. He is like 20 years older than me and I am older than dirt, that might have something to do with him not being as active in the forums.