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From: wescott@LNIC2.HPRC.UH.EDU (Andrew M. Wescott)
Newsgroups: comp.sys.apollo
Subject: 3 way db-25 pin outs
Message-ID: <9001081745.AA01207@lnic2.hprc.uh.edu>
Date: 8 Jan 90 17:45:44 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 24


Here are the pin-outs everyone is asking about:

(Figure 3-7 DS3500, DS4000, and DS4500 P2 SIO Three-Port Connector,
on page 3-11 of Domain Personal Workstations and Servers Technical
Reference # 008778-A01 )


  Pin #             Signal              Pin #            Signal
--------          ----------        ------------     -------------

   1               ground               16            sio2_dcd
   2               sio1_txd             18            sio2_dtr
   3               sio1_rxd              9            sio3_rxd
   4               sio1_rts             10            sio3_cts
   5               sio1_cts             19            sio3_dtr
   7            in-line resistor        21            sio3_txd
   8               sio1_dcd             23            sio3_rts
  11               sio1_p11             25            sio3_dcd
  20               sio1_dtr              6            spare
  12               sio2_txd             17            spare
  13               sio2_rxd             22            spare
  14               sio2_rts             24            spare
  15               sio2_cts