Hardware Flow Control on 4 Port Serial Cards

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3 total messages Started by Charlie Pilzer Tue, 17 Jan 1989 05:59

#1537

Author: Charlie Pilzer
Date: Tue, 17 Jan 1989 05:59

13 lines
1023 bytes

After a year of frustration and much to my amazement, I have learned that the
AIX supports hardware flow control on the serial ports.  The trick is to set
the 'pro' parameter to 'dc' when using the 'devices' command.  Then, the hardware
busy line from the peripheral must be routed to the CTS input on the RT.  The
IBM 10 pin to rs232 printer cable will support hardware handshaking.

I was unable to find this information in the manuals.  If it is documented, I
would appreciate a pointer to the pages.  It was only through a conversation with
a friend (Thanks Ted) that I found out that this might work on my machine's
configuration.

Charlie Pilzer
uunet!beartrk!clp

Re: Hardware Flow Control on 4 Port Serial Cards

#1539

Author: Charlie Pilzer
Date: Wed, 18 Jan 1989 03:23

22 lines
1667 bytes

In article <276@beartrk.UUCP>, I wrote:
> After a year of frustration and much to my amazement, I have learned that the
> AIX supports hardware flow control on the serial ports.
> 
A followup:  Now that I know hardware flow control works, I dove back into the
documentation and actually found where the flow control parameters are documented.

In the Virtual Resource Manager Tech Reference (update by TNL 26 Sept 1986, my
latest version) Chapter 12, there is a discussion of the Asynchronous Device Driver.
In the discussion, the three valid entries of the 'pro' parameter are mentioned.
They are: 'dtr' - data terminal ready, 'cdstl' - connect data set to line, and
'dc' - direct connect.  There is more interesting information in this book.  However,
I wouldn't look in it as a normal course of events.  My initial reaction to the VRM
was, "That's an interesting way to achieve hardware independence".  But it looks like
some knowledge of the VRM is useful to those of us who are using the RT as a "UNIX box".

I'm fortunate that I had this book here. Originally, it had been ordered by mistake in
place of the AIX tech reference.  But I think you need them both.

Charlie Pilzer
Bear Track Computer Company
uunet!beartrk!clp

Re: Hardware Flow Control on 4 Port Ser

#1542

Author: maher
Date: Thu, 19 Jan 1989 15:08

19 lines
1015 bytes


  On a related topic, could someone indicate what the
  "pro" (protocol) abbreviations

      dtr
      cdstl
      dc

  stand for?  I assume 'dtr' means that the 'data terminal ready' line
  is used for flow control, but what about cdstl and dc?


         Rob Maher, UIUC Computer Music Project

UUCP:     {seismo,uunet}!uiucuxc!maher    Phone: +1 217 244-1207
Internet: maher@uxh.cso.uiuc.edu  BITNET: maher@uxh.cso.uiuc.edu
US Mail:  2136 Music Bldg., 1114 W. Nevada, Urbana, IL  61801
University of Illinois at Urbana-Champaign

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