Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!helios!bcm!dimacs.rutgers.edu!seismo!uunet!omen!caf
From: caf@omen.UUCP (Chuck Forsberg WA7KGX)
Newsgroups: comp.sys.ibm.pc.misc
Subject: Re: DSZ upload problem at 19200 baud - flow control?
Message-ID: <52@omen.UUCP>
Date: 1 Mar 91 22:16:50 GMT
References: <7264.27cd2589@cc.curtin.edu.au>
Organization: Omen Technology INC
Lines: 45

In article <7264.27cd2589@cc.curtin.edu.au> Gumley_LE@cc.curtin.edu.au (Liam Gumley) writes:
-I am using DSZ.COM on a 386-AT to upload and download files from a VAX/VMS
-system that has RZ and SZ.  The transfers are done over a direct serial link
-(i.e. no modem, just cable.)
-
-Previously I have been able to do both uploads and downloads at 9600 baud with
-no problems.  A recent line upgrade now allows me to run my PC (as a terminal)
-with Kermit at 19200 baud.
-
-The problem is that while SZ(VAX) -> DSZ(PC) still works fine at 19200 baud,
-DSZ(PC) -> RZ(VAX) now gets all kinds of errors at 19200 baud.
-I have set the speed correctly for DSZ in each case.
-
-The errors start with the first 1024 bytes of data transmitted, and DSZ says
-Got ZRPOS.
-
-Okay, I looked in DSZ.DOC, and ZCOMMDOC for a solution.  They indicated that
-it was probably a flow control problem.  So I tried DSZ receive with
-handshake on, off, slow, both, and none of them worked - I still got the
-same errors.  Now it must be that the VAX cannot respond quickly enough to
-the PC at 19200 baud.  I have tried a couple of different versions of the
-software on both the VAX and the PC and get the same errors every time.

When sending to the VAX, you might try "handshake sw" to
enforce software flow control.  An alternative is to set a
ZMODEM packet length with "z pl1024" (normally, ZMODEM packet
length is the file length).

You might also check that ALTYPEAHEAD is enabled on the particular port
you are using.  The current VMS RZ (4.07) issues a warning if ALTYPEAHEAD
is not enabled.

System OMENVAX is a 730 with DZ11.  The 730 is not the fastest VAX ever
built, but it does compile rz/sz and Professional-YAM.  The 730 accepts
uploads at 19200 bps with few errors, but I use 9600 on it because 9600 is
just as fast.

Chuck Forsberg WA7KGX          ...!tektronix!reed!omen!caf 
Author of YMODEM, ZMODEM, Professional-YAM, ZCOMM, and DSZ
  Omen Technology Inc    "The High Reliability Software"
17505-V NW Sauvie IS RD   Portland OR 97231   503-621-3406
TeleGodzilla:621-3746 FAX:621-3735 CIS:70007,2304 Genie:CAF
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