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From: bio_zwbb@jhunix.HCF.JHU.EDU (Dr. William B. Busa)
Newsgroups: comp.sys.handhelds
Subject: Help please connecting 48 to Hayes modem
Message-ID: <7486@jhunix.HCF.JHU.EDU>
Date: 5 Feb 91 14:42:34 GMT
Distribution: usa
Organization: Dept. of Biology, The Johns Hopkins University
Lines: 37


	In attempting to use Bill Gribble's NRTS terminal emulator I've
run into big trouble interfacing my 48 to my Hayes Smartmodem 1200. I'm
not sure if the problem resides in the cabling, configuration switches,
IOPAR, or what, so here's my condition:
  
I've constructed a 9-pin to 25-pin adapter to connect my *genuine* HP
cable to the Hayes. It is wired as follows (using the standard 9 and 25
pin numbering):

HP		Hayes
2 (RXD) ->	2 (TXD)
3 (TXD) ->	3 (RXD)
5 (SGND)->	7 (SGND)
(p.s., I have also tried swapping 2 and 3)

Hayes config. switches:
1 down; 2 down; 3 down; 4 down; 5 down; 6 up; 7 up; 8 down; 9 up; 10 up.

IOPAR (in HOME directory): { 1200 0 1 1 3 3 }

The Hayes is set to 1200 baud.

In this configuration, when I place the string "ATDT918005551212" on the
stack and hit XMIT, the SD (send data) light on the Hayes blinks, but the
modem does not dial and nothing happens. A "1" is placed on the stack by
XMIT. When I next perform BUFLEN, a 0 is returned to level 2 and a 1 is
returned to level 1. 
	When I swap pins 2 and 3 and perform the same test, *nothing*
happens (i.e., the SD light doesn't blink). BUFLEN still returns 0 1. 
	It should go without saying that NRTS don't do nuthin currently.
	
	If anyone has experience interfacing the 48 to a Hayes, can you
point me in the right direction? THANKS!

p.s. -- all cables and solder connections are sound (the 48 communicates
with my computer OK.