BNU troubleshooting

Speed, character size and parity settings

Once the system doing the dialing gets the CONNECT signal (or the message connected from cu), you may still have baud rate problems, character size problems, or parity setting problems. For communications to proceed intelligibly, these values must match exactly on the remote and the local system.

Primarily, check the settings on the lines you are using on both machines, and make sure they are set up with matching baud rates, character size, and parity settings. See Config(4bnu) for information about these settings.

On incoming calls, the ttymon daemon handling the call does its best to figure your incoming speed. If you set up Auto-Select, then ttymon can usually determine your line speed, as long as you come in with a character size of 8 bits and no parity. If you don't use Auto-Select, press the <Break> key to increment the line speed to the speed you want. If you come in via cu, keying ~%b and pressing the <Esc> key does the same thing.

For (outgoing) modems, the speed defaults to 9600 baud. When you set the baud rate for a modem through the Serial Manager we recommend that you set the rate to the highest speed at which the modem can transmit and receive, rather than selecting auto.

NOTE: auto is intended to be used for direct lines and for some older modems.

This is because the speed that a modem talks to you at the serial port is usually a constant speed. If the remote wants to talk slower than this, that occurred on the modem-to-modem connection and the modem will slow down the bytes coming in as needed. For example, if the modem-serial port speed is 9600, and the remote wants to talk at 1200, the modem-to-modem speed will be 1200, but the modem-to-serial port speed will be 9600).

Note that a bug in this feature can make it look from the remote side that you have a speed problem and sometimes doing breaks will fix it. See ``Known problems and workarounds'' for further information.

© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 22 April 2004