TITLE: #009 - "Read timeout" error reported in log KEYWORDS: read timeout, modem, serial port, cable, disabled, enabled RELEASE: All CLASSIFICATION: All Topic-Modem PROBLEM: Faxes cannot be sent or received. Error messages of the form "read timeout" appear in the System Log or when software is run in trace mode. NOTE: this TechNote applies to the case in which the read timeout error occurs immediately after the software tries to initialise the modem. There is another cause of the "read timeout" error when it occurs during transmission only and after the fax machine has been dialled. For information on this case please see TechNote #072. CAUSE: The problem is that the modem is not responding to commands sent to the modem. There are many possible causes including: the modem is turned off, connected to the wrong port (i.e. a port different from that specified in the .../dev/fax-line-1 file), the cable is defective, or the serial port is enabled for log-ins. SOLUTION: To determine the cause of the read timeout errors, please follow the following steps: 1. Make sure the modem is powered-up (and make sure you are checking the correct modem). 2. Make sure that the modem is connected to the port that you have specified in the fax line configuration file. To examine the fax line configuration file(s), look in the following directory /usr/fax/dev/ (for Faximum ELS or PLUS R2.1) /opt/faximum/dev/ (for Faximum ELS, PLUS R2.2) /opt/FAXserver/dev/ (for Faximum Client/Server) /etc/opt/faximum/dev/ (for all others) and examine the file(s) in that directory to make sure they specify the correct port (i.e. the correct entry in /dev). 3. Make sure that the cable connecting the modem to the computer is the correct type to pass the data and modem control signals. 4. Make sure that the port you are connecting the modem to is not enabled for log-ins (i.e. has no getty process or port monitor watching the port). Refer to the documentation for your UNIX system to determine how to do this. 5. Power-cycle the modem (turn it off, wait 5 seconds and turn it on again). If no problem has been found so far, or if the read timeout errors persist, then it is time to try to run cu on the port and communicate with the modem. 1. Terminate (using the kill command) the existing faxlisten or faxgetty daemon on the port in question. Whether you have faxlisten or faxgetty running depends on the version of the software you are running. The quickest way to see which is running is to use the ps command (as root): ps -eaf | grep fax If you see a faxlisten process then you can just terminate it. For example: # ps -eaf | grep faxlisten fax 25228 1 0 Feb 9 ? 31:29 /usr/fax/lib/faxlisten root 20038 20036 4 17:29:11 p0 0:00 grep faxlisten # kill 25228 If you see a faxgetty process then you will have to edit your /etc/inittab file; find the line that is causing the faxgetty process to run on the port in question; change its status "respawn" to "off"; and then run: telinit q (If you get a "telinit not found" error you will have to refer to your documentation to determine the appropriate pathname for the telinit command.) 2. Configure cu (or tip on Sun Solaris machines) and try to run cu/tip on the port that is connected to the modem (refer to the documentation for your UNIX system to determine how to do this). 3. Once cu/tip is running, reset the modem to the factory default settings by typing: AT&F AT&W 4. Try the following commands and send the responses from the modem to Faximum Technical Support: AT+FCLASS=? AT+FMFR? AT+FMR? Note that you may have to reset the permissions of the tty port to be rw-rw-rw after running cu in order for faxlisten and/or faxcico to work. Try sending or receiving a fax again to see if the problem has been resolved. If not, try the following configurations to see if they have any effect. 1. Changing the port specified in the fax line configuration from the modem control device (i.e. /dev/tty1A) to the non-modem control port (i.e. /dev/tty1a) (in the case of SCO OpenServer 5). 2. Changine the port from the intelligent multi-port device to one of the motherboard serial ports (i.e. /dev/tty1A or /dev/tty2A). Although the use of these ports for fax communications is depracated in our documentation, using them for testing can often reveal significant information. If the problem persists after trying all of the above, please contact Faximum Technical Support and inform them of the steps that you have taken and the results observed. Faximum Software's Technical Support Department may be reached by fax at 1 (604) 926 8182 or by e-mail to email@example.com. Tech Note: 009 -- LAST UPDATED: Fri Apr 4 00:06:58 PST 2003 Copyright 1995-2003 Faximum Software Inc., All Rights Reserved. The complete set of Faximum TechNotes are available on the Internet at http://www.faximum.com/support
© Copyright 2003 Faximum Software Inc. All Rights Reserved.