My remote control system has had RS-232 capability for a while now. Have been slowly implementing RS-232 control for the various equipment I own which support it. Never thought to see whether my DIRECTV HR22-100 HD DVR's support RS-232 control. Was happy to learn that RS-232 control is supported via the rear usb port in conjunction with a compatible usb/serial adapter. Was even more happy to find all of the RS-232 codes in hex format including direct channel selection codes for channels 1-1000. Have to send a big "Thanks!" out to Duct Tape for posting those codes which can be found here. That being said, I was looking for some instant gratification yesterday, so I decided to pick up a usb/serial adapter at at my local Best Buy which I found one reference to online as working with an earlier model DIRECTV receiver. The usb/serial adapter I picked up is a "Dynex™ DX-UBDB9I 16" USB PDA/Serial Adapter Cable". Prior to heading out to pick up the adapter I actually got all of my remotes updated accordingly in addition to running null modem cables to each DVR from their respective extenders. Was definately pushing my luck getting everything setup ahead of time as one obscure reference online to the particular usb/serial adapter working for a different DIRECTV receiver does not exactly ensure success in my case. That being said, the remote control gods must have been smiling on me yesterday. Arrived home, got the usb/serial adapters hooked up, reset each DVR and was in business! As expected, the HR22-100 is far more responsive using RS-232. Could not be more pleased. While these DVR's will still dog it from time to time, i.e. delayed response to a given command the difference using RS-232 over IR is still quite dramatic.

 i'm glad the time it took me to type out all those codes is being put to good use :)

Definately being put to good use. Thanks again!

May I ask what control system you are using Lowpro? As much as I loved the USB-Serial interface, IP control is definitely my fav way to go as not only do you get the really fast response time, but you don't have to add any adapters or what not.

I am using Philips Pronto Professional TSU9600 remotes in conjunction with the RFX9600 extenders which support RS-232 control. The TSU9600 supports IP control as well. Unfortunately I'm not knowledgeable enough to implement IP control for a given device myself yet via ProntoScript, but intend on learning how to do so. As far as the IP control, I'd curious to know if navigating the guide is improved to any degree using IP control over RS-232, particularly with respects to paging through the guide as all other functions over RS-232 have been extremely responsive for me so far. Paging through the guide is improved using RS-232 versus IR, but only marginally so. I am still experiencing a delayed response from the receiver quite often when paging through the guide which at times is quite considerable just as I was when using IR. I'm pretty much of the opinion that it's the receiver and not the method I'm using to send the receiver the page up/down commands. Would be interested to hear your experience in this regard in addition to the specific model receiver you are using.

Would be willing to share your command set and codes for use with the 9600?

I also have the tsu9600 and rfx9600 with a HR24 DVR and am unsure of the command string to use for normal remote functions and was hoping for some help.

Sure. My TSU9600 configuration is available for download here on the forums. A link to the thread in question can be found by viewing my forum profile.

Please note that once downloading my configuration file you will need to open the XCF using PEP v1.1.20, not PEP v2 or v3. If opened in PEP v2 or higher all IR and RS-232 codes will be stripped from the file as I am not using the "My Database" component of PEP v1 to store my IR and RS-232 codes. That being said, once opening my configuration file in PEP v1 the device containing the needed RS-232 codes can found near the bottom of the tree view in the section, "Pronto Signals" under the device name, "Pronto Signals (DirecTV HR22-100 (Family Room) / 3.3 RS-232)". Enjoy!

Does this work with Crestron control? I have a CP3 processor and a Direct TV HR24-500

Serial is serial. It will if the HR24 supports USB-serial. [Link: applicationmarket.crestron.com]

The hr24-500 works fine with rs232. But I would do IP control at this point.

Sorry for bringing this back to life, but makes more sense to me.

Does the Tcp/ip interface have restrictions on concurrent accesses/connections?
I went rs232, which works right, because I didn't want to disrupt the use of direvtv iPad app. The direct2pc might be a concern as well

i use the app and also control my directv with URC Total Control via IP.  I don't use them at the same time so I haven't noticed an issue.  but then again, why would you be using two systems on the same receiver at the same time?   or am i misunderstanding the question?