Very Computer

by **System Administrat** » Fri, 25 Aug 1995 04:00:00

I'm having trouble setting up my USR Courier modems. I think it seems to be a
flow control problem. My modems answer the phone and hang up correctly but
when someone goes to transfer a file they keep getting CRC errors. I've
went thru the manual numerous time and tried various INIT strings and still
seem to be overlooking something. Could someone please send me a working
init string. Thanks.

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| John Maslanik |\/| | \ / Voice: (619) 449-6282 |
| MLXnet Admin | | |__ / \ Data/Fax: (619) 449-6274 |
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by **Brian Smi** » Fri, 25 Aug 1995 04:00:00

>I'm having trouble setting up my USR Courier modems. I think it seems to be a
>flow control problem. My modems answer the phone and hang up correctly but
>when someone goes to transfer a file they keep getting CRC errors. I've
>went thru the manual numerous time and tried various INIT strings and still
>seem to be overlooking something. Could someone please send me a working
>init string. Thanks.

Are they uploading TO you, or downloading FROM you?
If they are uploading to you, then the problem will be theirs, not yours.
If they are downloading from you, then try this:

I assume you have already put &B0 in your init string for fixed (high)
speed throughput.
Put &H1 in your init string to enable TRANSMIT CTS flow control.
Put &R2 in your init string to enable RECEIVE RTS flow control.

And I have no idea what to do in order to enable hardware flow control
on the software (Linux) side of things. Maybe it is there by default,
maybe it isn't.

If you do not have a 16550AN or equiv. UART, you had better lock your
serial port at no more than 38400. 19200 if your system is slow.

Quote:>--
>/---------------------------------------------------------------------------\
>| John Maslanik |\/| | \ / Voice: (619) 449-6282 |
>| MLXnet Admin | | |__ / \ Data/Fax: (619) 449-6274 |
>\---------------------------------------------------------------------------/

- Brian

by **Volker Schmi** » Mon, 28 Aug 1995 04:00:00

>>I'm having trouble setting up my USR Courier modems. I think it seems to be a
>>flow control problem. My modems answer the phone and hang up correctly but
>>when someone goes to transfer a file they keep getting CRC errors. I've
>>went thru the manual numerous time and tried various INIT strings and still
>>seem to be overlooking something. Could someone please send me a working
>>init string. Thanks.
>Are they uploading TO you, or downloading FROM you?
>If they are uploading to you, then the problem will be theirs, not yours.
>If they are downloading from you, then try this:
>I assume you have already put &B0 in your init string for fixed (high)
>speed throughput.
>Put &H1 in your init string to enable TRANSMIT CTS flow control.
>Put &R2 in your init string to enable RECEIVE RTS flow control.
>And I have no idea what to do in order to enable hardware flow control
>on the software (Linux) side of things. Maybe it is there by default,
>maybe it isn't.

No. It isn't enabled at the startup on default. I use the following in my
/etc/inittab

# set /dev/ttySx to 8-bit clean mode and use RTS/CTS
m0::bootwait:/bin/stty sane pass8 -clocal crtscts < /dev/ttyS0
m1::bootwait:/bin/stty sane pass8 -clocal crtscts < /dev/ttyS1
m2::bootwait:/bin/stty sane pass8 -clocal crtscts < /dev/ttyS2
m3::bootwait:/bin/stty sane pass8 -clocal crtscts < /dev/ttyS3

-volker
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Es gibt drei Dinge, von denen man nie wei?, wie sie enden:
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Very Computer

USR Courier Init String?

USR Courier Init String?

USR Courier Init String?

USR Courier Init String?