SUMMARY: EEprom/Modems/Suns

From: John Malick (
Date: Fri May 05 1995 - 13:15:17 CDT

Original Posting:

> To all you out there with modems attached to either of Sun's built-in serial p> orts,
> I have read, about as much as I can tolerate, conflicting reports concerning
> ignore-cd and rts-dtr-off values.
> One document says ttya-ignore-cd=true and the other doc says set it to false.
> One document says ttya-rts-dtr-off=true and the other doc says set it to false.
> What are the appropriate settings and what is the reason for setting them? How
> does this affect the modem..
> My system: SPARC 5 running Solaris 2.4 and an external 14400 data/fax modem at> tached
> to serial port 'a'.
> Can anyone help clear this up?


The overwhelming response is that you do not need to worry about those eeprom
settings. There only used to initialize the ports at boot time and when the OS
is up and your running your communcations software, the software will setup
the proper handshaking and carrier-detect.

For those that are not using any comm software except "tip". The admintool
sets up the hardware flow or software flow control.

One person responded with: Set both the tty parameters to false; this will
allow the Sun to respond to both carrier-detect and rts-cts control properly.
But again, this is only for boot up... Your software app will override any of
those settings...

There it is...


John Malick - Systems Engineering *
Star Systems Engineering *
984 Grantley Road *
York, PA. 17403 *
(717) 854-5911 Phone *
(717) 843-0091 Fax * Email *

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