> -----Original Message----- > From: kernelnewbies-bounce@xxxxxxxxxxxx > [mailto:kernelnewbies-bounce@xxxxxxxxxxxx] On Behalf Of Felipe Balbi > Sent: 21 March 2007 08:16 PM > To: kernelnewbies > Subject: RS232 pin controlling > > with the recent git-kernel, is there a way to control the bits passing > through each DB9 pin? > I mean: I want to send a message using ONLY DB9 pin 1 and DB9 pin 5 > (GND). Is it possible? Hi Felipe, Serial communications are usually carried out with the aid of specialised chips (UARTs), these chips use each of the lines (though not all are necessarliy needed) in the serial connector for specific purposes. Pin 1 of the DB9 serial connector is the carrier detect line. IIRC this is an input line, which detects when the remote device (such as a modem) is attached and available. See wikipedia for more info[1]. Thus I'm fairly sure you will not be able to send messages using pin 1. Martyn [1] http://en.wikipedia.org/wiki/RS-232 ---- Martyn Welch Principal Software Engineer Radstone Digital Processing Part of GE Fanuc Embedded Systems Phone: +44 (0) 1327 322748 email: martyn.welch@xxxxxxxxxxxxxx web: www.radstone.com ________________________________________________________________________ This e-mail has been scanned for all viruses by Star.The service is powered by MessageLabs. ________________________________________________________________________ -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
