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I am resurrecting some X10 devices with the aid of a USB-to-RS232 adapter. The problem is, that the adapter only works with the Firecracker device when there is another serial device on the line (the Firecracker is a pass-through device that monitors the RTS and DTR lines to do its magic). Is the PL2303 going to sleep without a real device on the line? Is there an option or command to keep it awake? Is there a cable configuration that would make it work without a real serial device present?

fixer1234
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casualuser
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  • [*Chip will NOT go to sleep mode when COM port is OPEN*](http://download.lenovo.com/ibmdl/pub/pc/pccbbs/thinkcentre_drivers/t1box01us17.txt) - so if a program keeps the port open (even if it doesn't write anything to the data lines) the chip won't go to sleep. –  May 11 '14 at 16:47
  • That seems to be a patch to a different driver than I am using ("Driver Change from v3.3.11.152"). What is that patch actually doing? – casualuser May 11 '14 at 17:47
  • That's about the only thing I found when searching "PL2303" and "sleep". It looks like a driver for the PL2303, I assume it comes with some Lenovo computers since it's on their site. –  May 11 '14 at 17:48
  • I found a datasheet with a listing for a control register. If someone knew how to set the control register, in particular to keep the PL2303 from going to sleep, that would work. http://html.alldatasheet.com/html-pdf/116844/ETC1/PL2303/802/8/PL2303.html – casualuser May 11 '14 at 18:00

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