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Surveyor Robotics Forum › Surveyor Robotics Forum › SRV-1 ARM7
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About the Zigbee communication (Read 4250 times)

johnhsieh

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Posts: 1

About the Zigbee communication
09/25/07 at 6:33pm

Hi everybody, my name is John and I am a graduate student researching in wireless sensor network area.
I am doing a survey on mobile nodes and came across SRV so here I am with some questions. Hoping to get some answer before I make the decision.
To my knowledge that Zigbee is used for transmitting comments or data from PC to the SRV, and vise versa.
My current interest is to use surveyor in a wireless sensor network comply with Zigbee protocol.
I know X-CTU utility is provided as a means of changing the radio channels in case of RF interference only, does this mean I will not be able to change the protocol stack?
If i do wish to change the code to allow data transmission between SRV and PC through Zigbee network which is setup by other modules, would that be possible?

Thank you for your help in advance.http://www.surveyor.com/yabbfiles/Templates/Forum//default/smiley.gif
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admin

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Re: About the Zigbee communication
Reply #1 - 09/25/07 at 8:15pm

There are a lot of options with the Zigbee modules that we don't use, but they are certainly available. We have been shipping the robots with firmware version 1090, which is quite old but stable. We have also tested version 10A2 successfully, though now they are up to version 10A4 - you can find the firmware versions here - http://www.maxstream.net/support/knowledgebase/article.php?kb=168

I see that version 10A3 supports now higher baud rates, though hardware flow control will be required - we should give that a try. You should take a look at the XBee reference manual to learn more about the firmware functions - http://www.maxstream.net/hottag/index.php?ht=/products/xbee/manual_xb_oem-rf-mod ules_802.15.4.pdf

SRV-1 Development Team
Surveyor Corporation

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deicher

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Re: About the Zigbee communication
Reply #2 - 09/26/07 at 11:53am

Quote from admin on 09/25/07 at 8:15pm:

SNIP
I see that version 10A3 supports now higher baud rates, though hardware flow control will be required - we should give that a try. You should take a look at the XBee reference manual to learn more about the firmware functions - http://www.maxstream.net/hottag/index.php?ht=/products/xbee/manual_xb_oem-rf-mod ules_802.15.4.pdf

higher baud rates? Does this mean with the h/w flow control mod described in this thread, http://www.surveyor.com/cgi-bin/yabb2/YaBB.pl?num=1187983020/7#7 and the 10A3 firmware a higher baud rate could be configured to support a a greater number of frames / second for a 640 x 480 image?

« Last Edit: 09/26/07 at 11:55am by deicher »

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admin YaBB Administrator Posts: 3676	Re: About the Zigbee communication Reply #3 - 09/26/07 at 1:27pm That's a good question. I suspect that it won't make any difference - I think the actual throughput is still about 80kbps, but I will check with Maxstream, and if higher throughput is supported, I will let you know.
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admin

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Re: About the Zigbee communication
Reply #4 - 09/26/07 at 2:38pm

Just got word from Maxstream - changing the baud rate doesn't change the throughput

Quote:

The throughput that you’re experiencing is the MAX throughput that the XBee can handle. The reason it is so much less than the 250Kbps is because of the additional overhead associated with 802.15.4. You may be able to get slightly faster throughput by disabling 802.15.4 MAC level ACK’s (ATMM1) but of course you will lose the reliability of acknowledged packets.

SRV-1 Development Team
Surveyor Corporation

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deicher YaBB Newbies Posts: 32	Re: About the Zigbee communication Reply #5 - 09/26/07 at 8:28pm okay, too bad, but I can understand thanks
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