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#16
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Re: Dell laptop serial port
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#17
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Re: Dell laptop serial port
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![]() USB 1.0 "low speed" comes out to 1500000 bits/second. This would include any encoding, bit shuffling, USB overhead, etc. Serial comes out to 92160 data bits/s (assuming 8N1 configuration, which is fairly standard; this is found by multiplying the baud rate by 80%=0.8). Also, USB is half-duplex query-based. USB is succebtable to congestion (that is, a lot of devices on the same hub will slow down bandwidth). Every USB packet is at least 22 bytes long (for the header). Serial is simple; the Tx and Rx lines just transmit data at the baud. So there is no overhead (handshaking and transmission control is often done with secondary lines). |
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#18
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Re: Dell laptop serial port
about serial being faster than USB. i don't have the facts to back this up but a Friend and i were programing vex bots over the summer. i had the standard vex USB to serial adapter plugged into a USB 1.1 port and my Friend was just using a standard serial cable. i noticed that his code loaded at least 5 times faster than mine every time.
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#19
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Re: Dell laptop serial port
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I/O Range:03F8-03FF IRQ: 04 Location: on Intel(R) 82801DBM LPC Interface Controller - 24CC |
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