My original question was:
> I have a Sparc20 running SunOS 4.1.3_U1.
>
> I would like to connect two external devices: a dial in modem and an
U.P.S
> which made by American Power Conversion to the serial port of the Sparc20
> via a DB-25(M) to 2 x DB25(F) Serial Port Splitter Cable.
>
> I have heard that the Sparc20 standard configuration should provide two
> serial ports via one connector and to utilize both ports I have to get
the
> Splitter Cable.
>
> Is this possible to configure ?
*********************************SUMMARY***********************************
The answer is YES, there are two serial ports ttya & ttyb. The Splitter
Cable is a standard Sun component. Cost is $50.00 from Sun Express
(800)873-7869 or $32.00 from Ultra Spec Cables (800)622-2537.
NOTE: Gary W. Cook <gcook@netcom.com> has also provided the pinouts for
custom built cables:
Signal A B
TD 2 14
RD 3 16
RTS 4 19
CTS 5 13
DSR 6
GND 7
DCD 8 12
TC 15 18
RC 17
DTR 20 11
TCO 24 25
Note that the B port doesn't have all the signals that the A port has. B
does not support synchronous communications.
SPECIAL THANKS FOR QUICK RESPOND TO THE FOLLOWING PEOPLE:
========================================================
Gary W. Cook<gcook@netcom.com>
Waqar Hafiz<whafiz@london.micrognosis.com>
Glenn Satchell<Glenn.Satchell@uniq.com.au>
Ric Anderson<ric@rtd.com>
Scott McBain<scott@luey.redars.ca.boeing.com>
Niall O Broin - Gray Wizard<nobroin@esoc.esa.de>
Linfinity Microelectronics Inc. Garden Grove CA - USA
Product/Test Engineering Dept.
James Tran<jtran@earthlink.net>
Phone: (714)372-8342
This archive was generated by hypermail 2.1.2 : Fri Sep 28 2001 - 23:11:16 CDT