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From: mason@noscvax.UUCP (Nicholas B. Mason)
Newsgroups: net.micro.pc
Subject: Re: 9 pin serial port on PC AT
Message-ID: <229@noscvax.UUCP>
Date: Tue, 25-Feb-86 14:22:37 EST
Article-I.D.: noscvax.229
Posted: Tue Feb 25 14:22:37 1986
Date-Received: Fri, 28-Feb-86 07:39:45 EST
References: <734@harvard.UUCP>
Reply-To: mason@cod.UUCP (Nicholas B. Mason)
Organization: Naval Ocean Systems Center, San Diego
Lines: 48

In article <734@harvard.UUCP> kevin@harvard.UUCP (Kevin Crowston) writes:
>Can anyone post or repost a mapping from the AT's 9 pins
>to (say) the 25 pins of an RS-232 DTE connector?

PC 9 pin to 25 pin connection

    1 ---- 8
    2 ---- 3
    3 ---- 2
    4 ---- 20
    5 ---- 7
    6 ---- 6
    7 ---- 4
    8 ---- 5
    9 ---- 22

    Also, if you want to connect the second serial port on the
    Advantage card but did'nt buy the AST cable. Connector J3
    on the Advantage card is the output for the second serial
    port. It has two rows of 5 pins.  Assuming the pins are
    numbered as:

	      6 7 8 9 10 <---J3 on AST
	      1 2 3 4 5       Advantage card

	then pin
	1 is DCD
	2    RxD
	3    TxD
	4    DTR
	5    signal gnd
	6    DSR
	7    RTS
	8    CTS
	9    RI
	10   ???

	Hope this helps...


	  Nick Mason
	  NOSC    San Diego , CA
          mason@nosc  or
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