6. How Do I Dial In And Out With My Modem Using getty_ps

Get your modem to dial out correctly. If you haven't read section How Do I Dial Out With My Modem go read it now! It contains very important setup information. You do not need to read this section if you only want to dial out with your modem.

6.1 Dial In And Out Modem Configuration

For dialin and dialout use, you have to set up your modem a certain way (again, using AT commands on your modem):

E1       command echo ON        
Q0       result codes are reported              
V1       verbose ON
S0=0     never answer (uugetty handles this with the WAITFOR option) 

&C1 DCD is on after connect only
&S0 DSR is always on
DTR on/off resets modem (depends on manufacturer - RTFM)

If your modem does not support a stored profile, you can set these through the INIT string in your config file. See below. Some modems come with DIP switches that affect register settings. Be sure these are set correctly, too.

I have started a collection of modem setups for different types of modems. So far, I only have a few of them, if you would like to send me your working configuration, please do so! You can get them at ftp://ftp.cc.gatech.edu/pub/people/gregh/modem-configs.

Note: to get my USR Courier V.34 modem to reset correctly when DTR drops, I had to set &D2 and S13=1 (this sets bit 0 of register S13). This has been confirmed to work on USR Sportster V.34 modems as well.

Note: some Supra modems treat DCD differently than other modems. If you are using a Supra, try setting &C0 and not &C1. You must also set &D2 to handle DTR correctly.

6.2 Installing getty_ps

Get the latest version from sunsite.unc.edu:/pub/Linux/system/serial. In particular, if you want to use high speeds (57600 and 115200 bps), you must get version 2.0.7j or later. You must also have libc 5.x or greater.

By default, getty_ps will be configured to be Linux FSSTND (File System Standard) compliant, which means that the binaries will be in /sbin, and the config files will be named /etc/conf.{uu}getty.ttySN. This is not apparent from the documentation! It will also expect lock files to go in /var/lock. Make sure you have the /var/lock directory.

If you don't want FSSTND compliance, binaries will go in /etc, config files will go in /etc/default/{uu}getty.ttySN, and lock files will go in /usr/spool/uucp. I recommend doing things this way if you are using UUCP, because UUCP will have problems if you move the lock files to where it isn't looking for them.

getty_ps can also use syslogd to log messages. See the man pages for syslogd(1) and syslog.conf(5) for setting up syslogd, if you don't have it running already. Messages are logged with priority LOG_AUTH, errors use LOG_ERR, and debugging uses LOG_DEBUG. If you don't want to use syslogd you can edit tune.h in the getty_ps source files to use a log file for messages instead, namely /var/adm/getty.log by default.

Decide on if you want FSSTND compliance and syslog capability. You can also choose a combination of the two. Edit the Makefile, tune.h and config.h to reflect your decisions. Then compile and install according to the instructions included with the package.

>From this point on, all references to getty will refer to getty_ps. References to uugetty will refer to the uugetty that comes with the getty_ps package. These instructions will not work for mgetty or agetty.