HP Forum Archive 13

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hp 49g adapter Message #1 Posted by steve on 1 Nov 2003, 3:41 p.m. I bought a hp49g off ebay the adapter i got uses 4 pins but my hp 49g uses 10 could i get an adapter somewhere?

Re: hp 49g adapter Message #2 Posted by James M. Prange on 1 Nov 2003, 5:01 p.m., in response to message #1 by steve What you need is a 49G cable. The adapter is for connecting to a 48 series calculator. See http://holyjoe.net/hp/cable.htm for more information on cables and adapters. See http://www.calcpro.com/ or http://www.hpcalculators.com/ for the cable.

Re: hp 49g adapter Message #3 Posted by James M. Prange on 1 Nov 2003, 8:23 p.m., in response to message #1 by steve PS: If you visit http://www.hpcalc.org/ and search for "cable", I expect that you'll find information on how to make your own. Regards, James

Re: hp 49g adapter Message #4 Posted by Francesc Casanellas on 2 Nov 2003, 3:38 a.m., in response to message #1 by steve The HP49G serial cable has plug-in adapters for compatibility with the HP48 series. It is delivered with the 4 pin HP48 adapter on. If you pull the end of the 4 pin connector you will get the 2x5 pin adapter for the 49 series. If you pull the RS232 connector, another 2x5 pin connector appears: this allows to conect an HP48 to an HP49. Edited: 3 Nov 2003, 2:21 a.m. after one or more responses were posted

Re: hp 49g adapter Message #5 Posted by James M. Prange on 2 Nov 2003, 4:29 p.m., in response to message #4 by Francesc Casanellas I hadn't considered the possibility that perhaps Steve hadn't removed an adapter from the cable. The 48 series (the "old" ones) uses a 4-pin connector for RS-232, and you can also connect an overhead projector display unit by plugging it into one of the expansion slots. But the 49G doesn't have expansion slots; it uses a 10-pin connector for both the RS-232 I/O and the display unit. Note that you can physically connect a cable made for HP palmtops to the 49G, but don't try it; the display goes dark immediately and it may well fry components in the 49G. Perhaps even more dangerous on 49Gs with serial numbers starting with ID93 or lower; they had mistakes in the I/O circuitry. The earlier 49Gs came with a cable having a 10-pin connector on both ends for connecting two 49Gs to each other, plus a 10-pin to 4-pin adapter so you can connect a 49G to a 48 series calculator using the same cable. If you asked for the "ROM update kit" or purchased a "connectivity kit", you also got a 10-pin to DB-9 cable in the kit. Later 49Gs added a 10-pin to DB-9 adapter in the package, so with that, you can use the same cable to connect two 49Gs to each other, or with one adapter connect to a 48 series, or with the other to any RS-232 device that uses a DB-9 connector. If you happen to have two of the 10-pin to 4-pin adapters, the calc-to-calc cable also works fine for connecting two 48 series calculators to each other. Regards, James

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