 | | Message transmission speeds. —Steve Baker
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| | | I'm thinking about building a robot with three Scouts acting as slaves to a single RCX - nine motors and a dozen sensors in all! I'm not quite sure what they are all going to do yet - but I want to plan the communications mechanisms first. What I'm (...) (24 years ago, 31-Dec-00, to lugnet.robotics)
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| | | | | Re: Message transmission speeds. —Brian
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| | | | (...) (snip) (...) The data rate is 2400bps, and each packet of N bytes of data has 5 + N bytes of overhead. So the more realistic time to send a 1 byte message is 24ms. Here is an excerpt from the Communication section of (URL) Did you check the (...) (24 years ago, 31-Dec-00, to lugnet.robotics)
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| | | | | | Re: Message transmission speeds. —Brian
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| | | | | (...) Oops. Two mistakes there. (5 + 1 + 1)*4 = 28 not 24, which is moot because "messages" apparently have a prefix of hex F7 as part of the data payload, so a message is actually 9 bytes or about 36ms. Makes it sound like you're doing nothing (...) (24 years ago, 31-Dec-00, to lugnet.robotics)
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| | | | | | | Re: Message transmission speeds. —Pete Sevcik
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| | | | | | In the RCX and the tower, the IR receiver is located close to the transmitter. When the transmitter is running, the adjacent receiver's Automatic Gain Control cirucit (AGC) becomes saturated, and sets the receiver sensitivity to it's lowest possible (...) (24 years ago, 30-Dec-00, to lugnet.robotics)
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| | | | | | Re: Message transmission speeds. —Steve Baker
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| | | | (...) That sounds believable. I send 6 one-byte messages in each comms cycle. That's gotta be a good 150ms - which is probably about what I'm seeing. How depressing. :-( (...) So, the first major speedup would be to send a 3-byte message containing (...) (24 years ago, 1-Jan-01, to lugnet.robotics)
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