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iPAQ 1940 and RS232
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Subject Author Date
iPAQ 1940 and RS232 Markus Humm 10-11-2005
|--> Re: iPAQ 1940 and RS232 Frank Steinmetz...10-11-2005
Posted by Markus Humm on October 11, 2005, 9:28 pm
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 Hello,

I had in iPAQ h1940 in my hands today which has according to HP no RS232
port, but the USB/RS232 combi cable is listed as optional accesoire.

After installing some sort of "device manager" it found a serial port
which looked exactly like a normal RS232 COM1, but my own application
which works fine on other PDAs didn't work right with this one.

What's wrong here? Is the port really missing and this device manager
reporting nonsense? Nearly unbeliveable since nearly all other HP iPAQs
do have a RS232 port...

Greetings

Markus


Posted by Frank Steinmetzger on October 11, 2005, 11:40 pm
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 Tue, 11 Oct 2005 21:28:02 +0200, Markus Humm schrob:

> Hello,
>
> I had in iPAQ h1940 in my hands today which has according to HP no RS232
> port, but the USB/RS232 combi cable is listed as optional accesoire.
>
> After installing some sort of "device manager" it found a serial port
> which looked exactly like a normal RS232 COM1, but my own application
> which works fine on other PDAs didn't work right with this one.
>
> What's wrong here? Is the port really missing and this device manager
> reporting nonsense? Nearly unbeliveable since nearly all other HP iPAQs
> do have a RS232 port...
>
> Greetings
>
> Markus

Could be the infrared port. And why should be the port invisible, if there
is no cable attached?
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Posted by Andreas Koch on October 12, 2005, 7:16 pm
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Markus Humm wrote:

> What's wrong here? Is the port really missing and this device manager
> reporting nonsense? Nearly unbeliveable since nearly all other HP iPAQs
> do have a RS232 port...

Did you connect the cable to the RS232 port of the PC?
I guess it plugs to the USB port, so its a USB<->RS232 converter cable.
These install a VIRTUAL Com-Port so applications that can only talk to
COM ports can use the cable.

Unfortunately, that sort of emulation usually is just 95% compatible to
real RS232 ports ;-)

Looking in Google groups for "virtual com port" plus whatever
error code your application returns should get your going



Posted by Markus Humm on October 12, 2005, 8:00 pm
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Andreas Koch schrieb:
>
> Did you connect the cable to the RS232 port of the PC?
> I guess it plugs to the USB port, so its a USB<->RS232 converter cable.
> These install a VIRTUAL Com-Port so applications that can only talk to
> COM ports can use the cable.
>
> Unfortunately, that sort of emulation usually is just 95% compatible to
> real RS232 ports ;-)
>
> Looking in Google groups for "virtual com port" plus whatever
> error code your application returns should get your going
>
1. I didn't connect it to the PC, nevertheless I should have

2. My application doesn't report any error. My app. communicates with
something other than a pc and the device normally gets powered from
the RS232 which works fine with a FSC Loox 410 and worked also okay
with a rx1710 and some older iPAQ. Here it doesn't power the device.
(and with that behavior even if it would otherwise be a RS232 it is
useless to me) It even works with a MDA III Smartphone which
according to T-Mobile has no RS232, but it has! (only conflicts with
IrDa but can be solved)

3. I'm not to shure whether it's a RS232 emulation over USB, because
most PDAs don't have a USB host, they only have a slave! And the
devicemanager I installed indicates no emulation.

Greetings

Markus


Posted by Andreas Koch on October 12, 2005, 10:49 pm
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Markus Humm wrote:
> 1. I didn't connect it to the PC, nevertheless I should have

Ehmm... the normal scenario is connecting the PDA to PC
via the PDA-USB cable, which emulates a PDA-RS232 cable.

Are you trying to connect the PDA to a non-PC hardware?
Could you explain in more detail? And what connectors does
your cable have?

> 2. My application doesn't report any error. My app. communicates with
> something other than a pc and the device normally gets powered from
> the RS232 which works fine with a FSC Loox 410 and worked also okay
> with a rx1710 and some older iPAQ. Here it doesn't power the device.

Ah, a microcontroller powered by the PDA?
What connector does that cable have?

The cables i know have a PDA or phone connector on the one side,
and an USB connector on the other (PC side). They are powered
by the PC via the USB and even charge the PDA while connected.

> 3. I'm not to shure whether it's a RS232 emulation over USB, because
> most PDAs don't have a USB host, they only have a slave! And the
> devicemanager I installed indicates no emulation.

They don't need to have USB host - they are USB client for the PC
USB host.
The emulation is just an USB device driver that creates a COM
port, usually with a number behind the really installed COM ports.





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