Hi, I recently got an HP48GX from a friend and tried to connect to my usb iMac running Ubuntu Linux with a serial DB9 to usb adapter; the adapter is recognized and properly showing under Linux as /dev/ttyUSB0 (I even connected a led to the TX line and
flashed it from python, so signal is ok).
But had ZERO success in trying to communicate with HP48GX from kermit, minicom and hptalx 1.3.1.
I used the pinout schematics from here:
https://www.educalc.net/1199484.page

Of course I connected the TX from pc's DB9 to RX of HP48GX and viceversa but tried all methods (kermit, xmodem, server mode) to no avail.Always timeout error on both ends (so there is some signal/cabling issue imho).

Did anyone have success with this setup?

thanks in advance

juan

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

fonsecajuan06@gmail.com wrote:

Hi, I recently got an HP48GX from a friend and tried to connect to my usb iMac

My last Apple was a ][+,

Did anyone have success with this setup?

...but datatransfer to a normal linux computer with kermit was working
when I used it last time a few year back.

Do you have correct udev rules so a user can use the port?

Olaf

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Wednesday, February 26, 2020 at 5:30:03 PM UTC-3, olaf wrote:

fonsecajuan06@gmail.com wrote:

Hi, I recently got an HP48GX from a friend and tried to connect to my usb iMac

My last Apple was a ][+,

Did anyone have success with this setup?

...but datatransfer to a normal linux computer with kermit was working
when I used it last time a few year back.

Do you have correct udev rules so a user can use the port?

Olaf

Hi Olaf, after your reply I chmod'ed to 777 /dev/ttyUSB0 but even running all the tools as root yielded no results.
Im suspecting the HP has a hardware problem in the serial port; otherwise Im looking to borrow an old pc motherboard with a built-in serial DB-9 port and try there.

Thanks!

juan

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Friday, February 28, 2020 at 8:30:09 PM UTC-5, fonsec...@gmail.com wrote:

On Wednesday, February 26, 2020 at 5:30:03 PM UTC-3, olaf wrote:

fonsec...@gmail.com wrote:

Hi, I recently got an HP48GX from a friend and tried to connect to my usb iMac

My last Apple was a ][+,

Did anyone have success with this setup?

...but datatransfer to a normal linux computer with kermit was working
when I used it last time a few year back.

Do you have correct udev rules so a user can use the port?

Olaf

Hi Olaf, after your reply I chmod'ed to 777 /dev/ttyUSB0 but even running all the tools as root yielded no results.
Im suspecting the HP has a hardware problem in the serial port; otherwise Im looking to borrow an old pc motherboard with a built-in serial DB-9 port and try there.

Thanks!

juan

You can test the pc side easy enough by putting a jumper wire between the Tx and Rx of your usb to serial adapter and see the echo of whatever you send out the port.

put a couple LED's between rx and gnd and tx and gnd and see if you get blinkinlights with activity.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Monday, March 2, 2020 at 10:51:36 AM UTC-3, Eugene Nine wrote:

On Friday, February 28, 2020 at 8:30:09 PM UTC-5, fonsec...@gmail.com wrote:

On Wednesday, February 26, 2020 at 5:30:03 PM UTC-3, olaf wrote:

fonsec...@gmail.com wrote:

Hi, I recently got an HP48GX from a friend and tried to connect to my usb iMac

My last Apple was a ][+,

Did anyone have success with this setup?

...but datatransfer to a normal linux computer with kermit was working when I used it last time a few year back.

Do you have correct udev rules so a user can use the port?

Olaf

Hi Olaf, after your reply I chmod'ed to 777 /dev/ttyUSB0 but even running all the tools as root yielded no results.
Im suspecting the HP has a hardware problem in the serial port; otherwise Im looking to borrow an old pc motherboard with a built-in serial DB-9 port and try there.

Thanks!

juan

You can test the pc side easy enough by putting a jumper wire between the Tx and Rx of your usb to serial adapter and see the echo of whatever you send out the port.

put a couple LED's between rx and gnd and tx and gnd and see if you get blinkinlights with activity.

yes and that works! That's why Im suspecting the problem is on the HP48GX side (if there's a voltage level missmatch between the serial connections that's out of my scope)

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Tuesday, March 3, 2020 at 2:00:33 PM UTC-5, fonsec...@gmail.com wrote:

On Monday, March 2, 2020 at 10:51:36 AM UTC-3, Eugene Nine wrote:

On Friday, February 28, 2020 at 8:30:09 PM UTC-5, fonsec...@gmail.com wrote:

On Wednesday, February 26, 2020 at 5:30:03 PM UTC-3, olaf wrote:

fonsec...@gmail.com wrote:

Hi, I recently got an HP48GX from a friend and tried to connect to my usb iMac

My last Apple was a ][+,

Did anyone have success with this setup?

...but datatransfer to a normal linux computer with kermit was working when I used it last time a few year back.

Do you have correct udev rules so a user can use the port?

Olaf

Hi Olaf, after your reply I chmod'ed to 777 /dev/ttyUSB0 but even running all the tools as root yielded no results.
Im suspecting the HP has a hardware problem in the serial port; otherwise Im looking to borrow an old pc motherboard with a built-in serial DB-9 port and try there.

Thanks!

juan

You can test the pc side easy enough by putting a jumper wire between the Tx and Rx of your usb to serial adapter and see the echo of whatever you send out the port.

put a couple LED's between rx and gnd and tx and gnd and see if you get blinkinlights with activity.

yes and that works! That's why Im suspecting the problem is on the HP48GX side (if there's a voltage level missmatch between the serial connections that's out of my scope)

The HP doesn't quite meet rs232 spec of the full +/-12v but it close enough that it works most of the time.
I assume you changed the48 to use wire and not ir?

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)