[comp.dcom.modems] USR 14.4K HST UPLOAD PROBLEMS - FLOW ERRORS - HELP!!

gcw20877@uxa.cso.uiuc.edu (George Wang) (01/15/90)

I am having problems uploading files with Zmodem (with hardware
CTS flow control ON) at high speeds... I have my COM port opened
at 38,400 and the actual connection is at 14.4K... In this
situation the manual says that one needs to use some kind
of flow control... hardware preferred... Therefore, I *AM*
using Hardware Flow control (even tried BOTH Hardware & Software)
but both Zmodem and YModem-G fail with FLOW ERRORS....

I have a XT system with a multi-io that has a NS16550AN High Speed
UART installed.... I have no problems DOWNLOADING files but when
I UPLOAD files I get a FLOW error ever 4-5K and the transfer
never goes through correctly... THe only way I can get UPLOADS
to work is if I open the com port at 9600 and CONNECT at 9600
but this seriously HURTS the overall throughput!!

Does anyone know how to fix this??? I would really like to get
uploads going at an opened COM port of 38.4K for best
results.. Could it be my XT system?? I heard that with the NS16550AN
chip that even a XT system should be able to deliver speeds
of 115,200 baud (IE, for NULL modem connections!)

Thanks in advance!
George

--
George Wang
University of Illinois
gcw20877@uxa.cso.uiuc.edu