slg@ukma.UUCP (Sean Gilley) (08/22/85)
Does anyone out there have the pinout configuration for an IBM
serial port on the serial/parallel card? The serial port is
a nine pin port, and after looking through the manuals can't seem
to find the exact configuration.
Thank you,
Sean.
--
Sean L. Gilley Phone: (606) 272-9620 or (606) 257-4613
uucp: {unmvax,research,boulder,decvax!ucbvax}!anlams!ukma!ukgs!slg
|| {ihnp4,decvax,ucbvax}!cbosgd!ukma!ukgs!slg
arpa: ukma!slg@ANL-MCS.ARPAgerman@uiucuxc.Uiuc.ARPA (08/24/85)
It has been awhile since this information was last posted to the net so
here it goes:
The IBM PC AT Serial/Parallel Adapter has a 9-pin D shell type
connector which is configured as follows:
Pin Signal Name (DCE) RS-232C Pin (DCE)
----- -------------------- -------------------
1 Carrier Detect 8 (CD)
2 Received Data 3 (RD)
3 Transmitted Date 2 (TD)
4 Data Terminal Ready 20 (DTR)
5 Signal Ground 7 (SG)
6 Data Set Ready 6 (DSR)
7 Request To Send 4 (RTS)
8 Clear To Send 5 (CTS)
9 Ring Indicate 22 (RI)
The above is for attachment to Data Communications Equipment such as a
modem. To attach to another terminal (DTE) device the following signal
lines must be changed:
Pin Signal Name (DCE) RS-232C Pin (DTE)
----- -------------------- -------------------
2 Recieved Data 2 (TD) (RD & TD Swapped)
3 Transmitted Data 3 (RD)
4 Data Terminal Ready 6 (DSR) (DTR & DSR Swapped)
6 Data Set Ready 20 (DTR)
/ 7 Request To Send 4 (CTS) \ (Pins jumpered together at
\ 8 Clear To Send 5 (RTS) / each end only in pairs. Pin
7 to 8, 4 to 5. Not needed
for Full-Duplex operation.)
This information may be obtained from the IBM Technical Reference,
Options and Adapters Mannual, Volume 2 after installing update pages
which are actually provided in the Technical Reference, Personal
Computer AT Mannual. This means you need the AT tech ref to get the
specification if you haven't already obtained one.uh@unido.UUCP (08/25/85)
Try this one:
1 Carrier Detect
2 Receive Data
3 Transmit Data
4 Data Terminal Ready
5 Ground
6 Data Set Ready
7 Request to Send
8 Clear to Send
9 Ring Indicate
Uwe Hoch
Computer Science Department, University of Dortmund
4600 Dortmund 50, P.O. Box 500500, W.-Germany
E-mail address UUCP: ...ihnp4!hpfcla!hpbbn!unido!uhhaddock@waltz (08/25/85)
/* Written 2:19 pm Aug 22, 1985 by ukma.UUCP!slg in waltz:net.micro.pc */ /* ---------- "IBM AT Serial Line Pinouts" ---------- */ >Does anyone out there have the pinout configuration for an IBM >serial port on the serial/parallel card? ======================================================================== If you're looking into the male, DB-9 connector from the outside, around at the back, the pins are numbered like this: |\ 1|. \ | .|6 2|. | | .|7 3|. | | .|8 4|. | | .|9 5|. / |/ The parallel port connector is oriented the same way and is directly below the DB-9. Information flow is something like this: +-------------- Carrier Detect | -------------| 1 Receive Data | ----------->>| 2 Transmit Data | <<-----------| 3 I B M Data Term. Ready | <<-----------| 4 Ground | P A R A L L E L / -------------| 5 Data Set Ready | ----------->>| 6 S E R I A L Request to Send | <<-----------| 7 Clear to Send | A D A P T E R ----------->>| 8 Ring Indicator | ----------->>| 9 | +-------------- ================================================================ _____ -Rusty- |\/ o \ o | ( -< O o Where's the fish? |/\__V__/ ARPA: Haddock%TI-CSL.csnet@CSNet-Relay.arpa or Rusty@Maryland CSNet: Haddock@TI-CSL USENET: {ut-sally, convex!smu, texsun, rice} ! waltz ! haddock
phco@ecsvax.UUCP (John Miller) (08/26/85)
According to D. Gary Grady at Duke U. Comp. Ctr. (mcnc!ecsvax!dgary),
the pinouts on the AT are as follows:
DB-25 PC-AT Signal source Purpose
----- ----- -------------- --------
1 - -- Protective ground (unconnected)
2 3 PC Send data
3 2 Modem Receive data
4 7 PC Request to send
5 8 Modem Clear to send
6 6 Modem Data set ready
7 5 -- Signal ground
8 1 Modem Carrier detect
20 4 PC Data terminal ready
(PC-AT refers to the 9-pin connector on the AT, DB-25 to the other end of
the serial adaptor cable.)
I haven't torn a cable apart to verify this information, but I have successfully
connected an AT to an HP plotter and to a PDP-11/24 based on this information,
so it seems to be correct.
--
John Miller (ecsvax!phco)
Dept. of Pharmacology, Univ. of N.C.-Chapel Hill
Chapel Hill, NC 27514 (919) 966-4628b-davis@utah-cs.UUCP (Brad Davis) (08/29/85)
[] There was one missing connection. This list was verified from the AT Tech Ref manual. >DB-25 PC-AT Signal source Purpose >----- ----- -------------- -------- > 1 - -- Protective ground (unconnected) > 2 3 PC Send data > 3 2 Modem Receive data > 4 7 PC Request to send > 5 8 Modem Clear to send > 6 6 Modem Data set ready > 7 5 -- Signal ground > 8 1 Modem Carrier detect > 20 4 PC Data terminal ready * 22 9 Modem Ring Indicator -- Brad Davis {ihnp4, decvax, seismo}!utah-cs!b-davis b-davis@utah-cs.ARPA