HP Forum Archive 06

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Conecting a Pc to a HP48GX via infrared port Message #1 Posted by Nicolas on 21 June 2001, 1:23 p.m. Is posible to conect a HP48GX calculator to a Pc via infrared port? (Please send details)

Re: Conecting a Pc to a HP48GX via infrared port Message #2 Posted by John Ioannidis on 21 June 2001, 3:28 p.m., in response to message #1 by Nicolas Not trivially. PC infrared ports talk IrDA, an extremely hairy suite of protocols; when you use the infrared port as a serial port, you are really using the IRCOMM protocol of the IrDA protocol suite. The HP48 infrared protocol is extremely simple; two kinds of pulses, one for 0 and one for 1. There have been cicuits published on how to make an IR interface for the HP48, but it's just as simple to make a serial cable (although I imagine that you have your reasons for asking on how to do it over infrared). Check out www.hpcalc.org; there should be some information on it there. /ji

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