Download the serial port hardware specs on the Palm website.
Short answer, you cannot control any of the control lines directly using any
of the APIs.  Plus RI, DSR and CD are not used by the Palm.

----- Original Message -----
From: "Owen G. Emry" <[EMAIL PROTECTED]>
To: "Palm Developer Forum" <[email protected]>
Sent: Thursday, August 31, 2000 11:52 AM
Subject: serial port info


> I'm building a program to talk to a custom hardware device using a serial
> interface.  I'd appreciate pointers to any/all information on the Palm
> device serial hardware.
>
> I've used the Serial Manager before.  How does one talk to the serial
> hardware at a lower level?  Specifically, is there a way to manipulate the
> control lines manually?
>
> I gather that the Serial Manager can perform hardware flow control
> automatically, which would use the RTS/CTS lines.  What, if anything, are
> the DTR/DSR lines doing?  Are they controllable programatically?  Also, is
> there any way to poll the status of RI or CD?
>
> Thanks very much!
>
> oge
> -----
> Owen G. Emry
> [EMAIL PROTECTED]
> (703) 319-9641
>
>
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