Re: Unsuccessfull serial communication with CF 2.0

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Inline:

>>>From your replies, I understand the following:
> 1. The CompactFlash cable I've purchased provides a serial port for the
> PDA but the problem is not here. The problem is that the PDA does not
> provice any voltage to RTS or DTR pins of the CompactFlash slot.
It is the CF card does not provide power to the RTS pin.

> 2. You tell me to supply power to this pin externally. How? A battery
> attached to the PDA? Tell me please (although I don't like the idea
> very much).
If you are not comfortable with this you should ask the manufacturers of the
serial device, or better still an electronics engineer, for advice on this.

> 3. The PDA I'm trying with is an iPAQ h5500. Are iPAQs so special for
> serial communication?
Every serial device I have ever used has it's own power supply so would work
perfectly with your PDA, I am aware that some serial devices use RTS for
power but have never used any.

> 4. I don't know about crossed cables and de-crossers. Could you give me
> a good link based on the CompactFlash cable I mention above in the
> post?
> 5. The problem could be because of the manufacturer's cable?
You should get a volt meter and see if the pins at the end of your cable
provide a voltage (ground is pin 5 and RTS will connect to pin 8 at the
other end of the cable (which is infact CTS)). The pins are actually
numbered on normal serial cables (with little tiny numbers). If there is a
suitable voltage there then you have other problems (as Dick mentioned
perhaps there is insufficient power for your device, back to the
manufacturer again I am afraid).

> If I do not supply voltage to the mentioned pin, isn't there another
> solution? Just I won't be able to achieve satisfactory serial
> communication? I can't believe my eyes :(
> I thougth serial communication did not depend so much on the PDA and on
> the external device. I thougth the Compact Flash was the only thing I
> need.
Ordinarily the compact flash serial card may well have been the only thing
you needed, unfortunately in your case you have chosen a serial device that
requires power from the serial to work (which in my opinion is not the
norm).

Additionally, as you are using the iPaq h5500, why are you using a CF card
for the serial comms? You can get a serial cable for the h5500 that plugs
into the connector at the bottom of the PDA that gives you access to COM1 on
the PDA, you may find that this does provide the necessary voltages? (here
for example http://www.expansys.com/product.asp?code=109386 )


.

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