[comp.sys.next] RS-423 to RS-232C Serial Cable

zamenhof@csli.Stanford.EDU (Dan Fish) (02/15/91)

Fellow NeXT OwNERS:
  Please email me if you can help.  I want to hook up my NeXTstation as
  a terminal for a microcontoller board which has a RS-232C port with a
  DB-25 connector.  I looked at the ZS man page as printed in the Network
  and System Admin book.  It gives what appears to be an RS-422 to RS-232
  cable for a terminal.  I am guessing that this cable will work for the
  RS-423 port I have.  If I apply that cable hookup to the RS-423 pinout
  and the RS-232C pinout I get the following:
          RS-423       RS-232C
          1 (DTR)  ->  8  (DCD)
          2 (DCD)  ->  20 (DTR)
          3 (TXD)  ->  3  (TXD)
          4 (GND)  ->  7  (SG)
          5 (RXD)  ->  2  (RXD)
          8 (CTS)  ->  7  (SG)
  Is this correct?  I am wary of TXD->TXD and RXD->RXD instead of
  TXD->RXD and RXD->TXD.  Also, should CTS be connected to SG?
  Thanks for your help.  I am fearful of frying either of them.

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# Daniel Fish            Proud NeXTstation OwNER #  ---====-===========-----
# Stanford University   Junior  Symbolic Systems #  ---=================----
# Plain email only to zamenhof@csli.stanford.edu #  ---====-===========-----
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