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Topic:
Directv RS232 HR20/21
This thread has 4 replies. Displaying all posts.
Post 1 made on Monday October 6, 2008 at 17:10
Don O'Brien
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If anyone has implement RS232 control with the HR20/21 utilizing an RFX9600 can you share if you have used a straight through or null cable?

Thanks.
Post 2 made on Monday October 6, 2008 at 19:41
Kevin Magee
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IvonV
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I am trying to control an HR21 through RS232. I have connected the recommended GUC232A USB adapter to the RFX9600. I did have to connect using a female/female cable as both the adapter and RFX unit have male pin outs. I am using a straight through cable (as opposed to null modem).

I am trying to send the active command which is FA 82 hex to turn on the unit (I've tried with both 0D -- Carriage Return -- and without). Based on some other readings online I've tried at different baud rates though the DirecTV manual specifies 9600. I've also tried rebooting the HR21 after hooking everything up. According to the manual, a reboot is necessary to recognize the USB connection. With all that done, I cannot get the command to work.

I saw one other thread here with someone having the same problem, but apparently getting it to work eventually, but I'm not sure what they did other than sending hex instead of ASCII. Does anyone have any suggestions or solutions to try?

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Post 2 made on Friday August 22, 2008 at 09:38
cma
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Did you try a null modem cable or adapter?
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Post 3 made on Friday August 22, 2008 at 12:50
IvonV
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Do you think null modem would make sense? If the extender had a female output, I would be plugging the adapter directly into that. The cable is simply being used as a gender changer.

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Post 4 made on Saturday August 23, 2008 at 02:56
IvonV
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I tried the null modem cable and it worked. Thanks, cma.

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Post 5 made on Sunday August 24, 2008 at 13:19
Kevin Magee
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I am trying to send the active command which is FA 82 hex to turn on the unit (I've tried with both 0D -- Carriage Return -- and without). Based on some other readings online I've tried at different baud rates though the DirecTV manual specifies 9600. I've also tried rebooting the HR21 after hooking everything up. According to the manual, a reboot is necessary to recognize the USB connection. With all that done, I cannot get the command to work.

When you got it to work did you need Carriage Return? Thanks for the link to the manual.
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Post 6 made on Sunday August 24, 2008 at 13:31
IvonV
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No carriage return and baud rate 9600.

IV
OP | Post 3 made on Monday October 6, 2008 at 22:05
Don O'Brien
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Kevin,
thanks for the copy and paste from the thread. I read that thread when I was tired last night and.. just missed it.

Confirming
1) Use Null cable
2) No carriage return
3) baud rate at 9600

Command set and instructions can be found here
[Link: sbcatest.com]

To all who are interested:
Assure you only use the recommended USB to serial adapters

Rebooting the receiver after attaching the serial adapter does not work reliably. Remove power from the DVR, attach the USB adapter, power the receiver up and you are good to go.

Regards,
Don

Last edited by Don O'Brien on October 6, 2008 22:26.
Post 4 made on Wednesday October 8, 2008 at 00:55
Drabert
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October 2008
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I must be right on your heels Don, because i am about to purchase a Pronto with the RFX9600 and i was very curious about how i could use the rs232 for this. I am EXTREMELY new to this, but hopefully with my little bit of programming background and some good searching technics i will be able to find all the info that i need.

Just on a side note, do you know of any good "beginner" tutorials for RS232 control of devices?

Thanks!

Drabert
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