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Connectivity Issues with 48G series - Printable Version

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Connectivity Issues with 48G series - Ed Look - 08-04-2007

I have both a HP-48G and a 48G+. I used to be able to connect to them oh-so-easily. Ever since Win XP, I can easily connect to a 49G+, but neither of the 48G series babies can connect.

The error message always says that no calculator or no device is found on COM2. I hope the only old fashioned serial port on my PC is COM2, as my link cable is 48G proprietary four pin to serial.

Are there any of you here who are able to consistently connect successfully their 48G series machines to their PC? I'd love to get my 48G and G+ back onto the PC.


Re: Connectivity Issues with 48G series - Allen - 08-04-2007

RS232 ports when native on the motherboard usually default to COM1 unless you specify otherwise. Check your settings in the START-> Control panel -> Hardware device manager.

If nothing else, get a USB to serial converter. This will allow you to configure the COM ports more easily compared to a hardwired RS232. As a side note, many manufacturers are not FULLY supporting the Rs323 interface at the specification level w/r/t the DTR and other important signals- this is especially prevalent in Laptop computers where the pins may LOOK like Rs232, but they do not fully behave RS232.


Re: Connectivity Issues with 48G series - Thomas Okken - 08-04-2007

My HP-48G and my laptop have no problem talking to each other. On the PC end I use Windows XP Home and Conn4x; the machine has no serial ports built-in but everything works fine with an external USB-to-serial converter.

- Thomas


Re: Connectivity Issues with 48G series - Ed Look - 08-04-2007

Why, thank you for the insight!

I appear to have three ports listed in the Device Manager: COM1, COM2, and LPT1.

I don't see a way to reconfigure the ports and there is only ONE such port on my motherboard. Bleaghh.

If I use a USB to serial converter, it looks like I'll use one yet another USB port... but may be worth it. I'll look into that, too.


Re: Connectivity Issues with 48G series - Ed Look - 08-04-2007

I see. It appears more and more this is the way to go. Legacy stuff; bah. Yeah, yeah, I know... just like the rest of us here, I'm a "legacy" calculator nut...

... but how does this converter work?

If I connect the serial end of the converter cable to my serial port, I have a USB end left; not usable on the 48G.

If I connect the USB end to a USB port, I have a serial end left; still unusable on the 48G...

... unless the serial end of my existing 48G to serial cable connects to the converter which then plugs into a USB port...

... right?


Edited: 5 Aug 2007, 12:21 a.m.


Re: Connectivity Issues with 48G series - Thomas Okken - 08-05-2007

Quote:
unless the serial end of my existing 48G to serial cable connects to the converter which then plugs into a USB port

Yes, that's how it works.