Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!udel!gatech!ncar!unmvax!ariel!carina.unm.edu!cs2531bz From: cs2531bz@carina.unm.edu ( Malg The Mage) Newsgroups: comp.sys.atari.8bit Subject: Re: rs232 Keywords: rs232 Message-ID: <530@ariel.unm.edu> Date: 18 Sep 89 13:59:14 GMT References: <3274@draak.cs.vu.nl> Sender: news@ariel.unm.edu Reply-To: cs2531bz@carina.unm.edu.UUCP ( Marc Bluefire) Organization: University of New Mexico, Albuquerque Lines: 39 In article <3274@draak.cs.vu.nl> atverko@cs.vu.nl (Verkooijen Alexander T) writes: >I guess this is a very stupid question, but why is there a 'R' device >to address the rs232 on the XL? >Which pins on which port are the rs232 pins? The pins which are treated as rs232 pins are the I/O port pins... The 'R' device is mainly non-exsistent unless you have bought a RS232 Interface, such as PR: Connect or the older Atari 850. But, you can program the R: Device to control things such as a Direct-Connect modem... the SX212 is such a modem, and I am using it right now without an RS232 Interface (Well, I would be if I was using my Atari right now, but I'm using my Commodore 128 with it's interface to the SX212). Well, anyway, it's just a convenient way for the atari to address RS232 peripherals.. (from the SX212 Manual) RS232 Port 1 - Ground 2 - Transmitted Data 3 - Received Data 4 - Request to Send 5 - Clear to Send 6 - Data Set Ready 7 - Signal Ground 8 - Carrie Detect 9-19 - Not Connected 20 - Data Terminal Ready 21 - Not Connected 22 - Ring Indicator 23-25 - Not Connected (12 is also sometimes used as a High Speed Indicator > 300 Baud) 13 12 11 10 9 8 7 6 5 4 3 2 1 . . . . . . . . . . . . . . . . . . . . . . . . . 25 24 23 22 21 20 19 18 17 16 15 14 Serial I/O Port 1 - Clock Input 2 - Clock Input 3 - Data Input 4 - Ground 5 - Data Output 6 - Ground 7 - Command 8 - Motor Control 9 - Proceed 10 - +5/Ready 11 - Audio Input 12 - Not Connected 13 - Interrupt 2 4 6 8 10 12 . . . . . . . . . . . . . 1 3 5 7 9 11 13