New from the Horses Mouth on the HP50G and RS232 [HP48]

Prev: IR xfer with 50g
Next: TRANSITION FROM HP48 TO HP50

From: Harold Climer on 31 Jul 2006 16:35

I got this E-Mail reply to my Phone call to HP

To: <harold-climer(a)utc.edu>
Subject: serial pin (KMM12072521V75642L0KM)
From: HP Calculator E-mail Support
<calculator_support_en(a)mail.support.hp.com>

Hello,

Thank you for contacting HP Total Care.

The pins are Ground/RX/TX/6V

Here is a link to another company that sells cables with the right
connector:
http://www1.jaycar.com.au/productView.asp?ID=WC7720&CATID=&keywords=usb&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=

However, please realize that it will be hard for any individual to
tinker with a modern system such as the HP50g, modern manufacturing
techniques and components are just not designed for home hobbyist and
do not let themselves to be worked on in a garage (for example, the
sub 1mm pitch of the connector makes soldering extremely hard for
someone who is not a trained electrical engineer).

Sincerely,
Kellie
HP Total Care

Our advice is strictly limited to the question(s) asked and is based
onthe information provided to us. HP does not assume any
responsibilityor liability for the advice given and shall not be
liable for any direct, indirect, special, incidental or consequential
damages in connection with the use of this information. Always back
up your data.
For more information, including technical information updates, please
visit our Web site at http://www.hp.com/support.
Harold A. Climer
Dept,Of Physics,Geology & Astronomy
U.T.Chattanooga
Room 318 Grote Hall
615 McCallie Ave
Chattanooga TN 37403
423-425-4546

From: Harold Climer on 31 Jul 2006 16:42

I looked at the picture of the connector at the electronic parts store
in the previous reference and it looks like the mini USB port on the
calculator. The connector for the RS232 is rectangular and has a slot
in the top right hand corner, when looking at it with the calculator
face up, so that the plug can only go in one way.
Harold A. Climer
Dept,Of Physics,Geology & Astronomy
U.T.Chattanooga
Room 318 Grote Hall
615 McCallie Ave
Chattanooga TN 37403
423-425-4546

From: Harold Climer on 31 Jul 2006 16:58

From: James M. Prange on 31 Jul 2006 20:21

Harold Climer wrote:
> I got this E-Mail reply to my Phone call to HP
>
> To: <harold-climer(a)utc.edu>
> Subject: serial pin (KMM12072521V75642L0KM)
> From: HP Calculator E-mail Support
> <calculator_support_en(a)mail.support.hp.com>
>
>
> Hello,
>
>
> Thank you for contacting HP Total Care.
>
>
>
> The pins are Ground/RX/TX/6V

But what are the signal levels on the RX and TX lines? Are they
0V/+3.3V, as I believe they are at the 48gII's port, or are they
more like the 48 series, or even in compliance with EIA-232?

Perhaps the 6V line might be intended as a possible power source
for an external level-shifter?

And which pin is which?

Yes, I realize that I could purchase a 50g and use an oscilloscope
to find answers to some of these questions, but it seems to me
that they shouldn't even have to be asked.

>
> Here is a link to another company that sells cables with the right
> connector:
> http://www1.jaycar.com.au/productView.asp?ID=WC7720&CATID=&keywords=usb&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=

Well, the "mini-B" end *looks* as if it would fit, but the other
end is a USB type A connector! Surely we'd want a DB9 or DB25
connector there; I don't expect that any (more or less) RS-232
port would work well connected to a USB host!

>
> However, please realize that it will be hard for any individual to
> tinker with a modern system such as the HP50g, modern manufacturing
> techniques and components are just not designed for home hobbyist and
> do not let themselves to be worked on in a garage (for example, the
> sub 1mm pitch of the connector makes soldering extremely hard for
> someone who is not a trained electrical engineer).

That seems like an excellent reason for HP to make the proper
cable available, if not supplied with the calculator, then at
least as an optional accessory.

>
>
>
>
> Sincerely,
> Kellie
> HP Total Care
>
>
>
> Our advice is strictly limited to the question(s) asked and is based
> onthe information provided to us. HP does not assume any
> responsibilityor liability for the advice given and shall not be
> liable for any direct, indirect, special, incidental or consequential
> damages in connection with the use of this information. Always back
> up your data.
> For more information, including technical information updates, please
> visit our Web site at http://www.hp.com/support.
> Harold A. Climer
> Dept,Of Physics,Geology & Astronomy
> U.T.Chattanooga
> Room 318 Grote Hall
> 615 McCallie Ave
> Chattanooga TN 37403
> 423-425-4546

--
Regards,
James

| Next | Last
Pages: 1 2 3
Prev: IR xfer with 50g
Next: TRANSITION FROM HP48 TO HP50