From: ellis@nova.gmi.edu (Stew Ellis)
Subject: Re: Zmodem installation problem
Organization: GMI Engineering&Management Institute, Flint, MI
Date: Sat, 29 Aug 1992 14:48:52 GMT

zzang@whale.stat.ufl.edu (Zhuo Zang) writes:

>Hello, 
>Thanks for the responses !

>In article <1992Aug13.183019.4034@fripp.ri.cadre.com> jh@cadre.com writes:
>>In article 22845@eng.ufl.edu, zzang@whale.stat.ufl.edu (Zhuo Zang) writes:
>>>Hello,
>>>I try to install the Zmodem on the DECstation
>>>with Ultrix 4.2 .
>>>After I compiled all the programs, rz ,sz ,....
>>>I ran the programs. And it doesn't work.
>>>The problem seems that the Zmodem didn't 
>>>direct the data flow to the serial port
>>>correct, I need to set the tty somehow,
>>>but I don't know how.
>>
>>You may be confused about how ZModem works.  It actually sends its output
>>to stdout (on UNIX).  For example, when I dial into my UNIX box, I'll

>I really don't have any idea how those modems work.
>I thought the Kermit , Xmodem , Ymodem and Zmodem all worked
>the same way. They would send the data flow to the serial port
>at one end the comm line, and receive the data at the serial
>port at the other end.

>>type sz <filename> to initiate the download to my machine at home.  My 
>>comm program then actually understands that a Zmodem transfer has started,
>>and begins receiving automatically, although if yours doesn't, it can
>>certainly be started manually.
>>   I'm not exazctly sure what you mean by "direct the data flow to the serial
>>port," though.  If you gave a little more detail as to how you're doing things,
>>we might be of a little more help.
>>

>I use the Procomm2.4.2, which doesn't have the Zmodem. But it does
>have the Kermit, Xmodem and Ymodem. and I use the Xmodem and Ymodem 
>when I connect to the BBS. on Unix I am using Kermit now,
>but it is slow. The Zmodem package says it also supports
>the Ymodem and Xmodem. So I use sz <file> on Unix to start
>downloading, and use the Ymodem in ProComm to receive <file>.
>According to the Zmodem manual, the Zmodem will auto down shift
>to Ymodem, if it finds the other end doesn't support the Zmodem.
>However, nothing is transmitted in this way.

>Since all the data flow should be transmitted thru the serial port
>when we use the modem to connect to the Unix, I doubt that
>the Zmodem had sent the data to somewhere else, not the serial port.

>>---
>>Joe Hartley          | jh@cadre.com  -  Whenever you find that you are on the


>zhuo

If you are trying to use sz on the UNIX host to send to X or Ymodem in
procomm on your PC, I believe the author of zmodem (Chuck Forsberg) says
that the procomm ymodem is misimplemented.

Whoever installed sz on your unix machine should have linked it to sx and sy
to support downloading with the X and Y modem protocols respectively.  If
they did not, then you can create links for them in your own binary
directory.

--
--                                                        ___________________
  R.Stewart(Stew) Ellis, Assoc.Prof., (Off)313-762-9765  /   _____  ______ 
  Humanities & Social Science,  GMI Eng.& Mgmt. Inst.   /        / /  /  / /
  Flint, MI 48504      ellis@nova.gmi.edu              /________/ /  /  / /