[comp.dcom.modems] X/Ymodem & Unix

gt2613b@prism.gatech.EDU (HSU,YUNG KAO) (08/06/90)

Hello, everyone in this group!!

I have a problem in using X/YMODEM file transfer protocol between my
pc and unix. Since I have no manuals(if they exist) and can only tried
it based on my limited knowledge of this field, I hope someone here could
give me information as regards to these problems.

1. When sending certain files from unix to pc, timeouts were encountered
   repeatedly. Since they all occurred at a given point for any particular
   such files, I suspect that there is a sequence of text in the file
   that caused the protocol to behave differently (i.e, command string).
   Is my guest correct?

2. I had no luck at all in sending files from pc to unix. After I issued
   commands respectively between two systems, they both sat still.
   I used no options in either `rb' or `rx' command at unix side.

I sincerely hope someone could give me pointers as where I can get some
information concerning these protocols. Since I am not a regular reader
of this group, I appologize if such questions have been posted and answered
before. Thanks in advance.




-- 
YUNG-KAO HSU,	     ICS, COLLEGE OF COMPUTING   >L   me := self deepCopy.
hsu@cc.gatech.edu		  GEORGIA TECH   =+   [me boring]
...!{akgua,decvax,ihnp4,ulysses}!gatech!cc!hsu	 O|	whileTrue: [me rn].

dnb@meshugge.media.mit.edu (David N. Blank) (08/07/90)

I don't know what your specfic problems are, but let me give you two
pointers which should always be checked when dealing with [XYZ]modem:
  o make sure you have a 8-bit path (ie. both the sender and receiver
    must agree to be using 8 bits.  On SYSV UNIX machines this is done
    by typing 'stty cs8' (or 'stty cs8 -parenb' more often so parity
    won't be a problem).  
  o make sure that there is no software flow contol happening on
    either side of the line, since the protocols (especially Zmodem)
    can handle internally the problems that XON/XOFF are designed to 
    help with.
 
Hope this helps.
          Peace,
            dNb