Common Problems and Their Solutions
Problem: Modem answers incoming calls and then returns to the on-hook condition,
disconnecting the caller.
This occurs most often when connecting to a UNIX system. In most case, the host does not prefer to
see any result or command echo codes. If this is the case, adding E0 Q1 to the modem configuration
string can disable the codes.
Problem: No echo from modem
An I/O address or IRQ conflict normally causes this. Verify that the COMPort is not in use by any
other serial device and if necessary use another COM Port or I/O address setting. Refer to Appendix
A for information on Determining What Serial Ports Are Installed On Your Computer. You may also
need to refer to your computer or I/O card hardware manual.
Problem: The modem dials and appears to complete the connection, but the communications
software does not enter the correct mode. (The screen remains blank.)
There may be an I/O conflict (See the solution for the previous problem, "No echo from modem").
The Result Codes may have been disabled by the software configuration set up. Check if Q1 is in
the configuration or initialization string. If so, change it to Q0.
Your software may require numeric result codes rather than verbal result codes. Use either V0 for
numeric result codes or V1 for verbal result codes in your initialization or configuration string.
Some software requires full extended result codes (ie. CONNECT 33600 instead of CONNECT).
This can be controlled by the Xn command. X0 sends a summarized code (CONNECT) and X4
sends a full extended code (CONNECT 33600).
Problem: The modem does not auto answer.
The auto answer mode is determined by the S0 register. If S0 has been set to 0, the modem will not
answer. Assign another value to S0 by entering the following command S0=n, where n=the number
of rings to occur before the call is answered (ATS0=2, the modem answers after two rings).
Problem: The modem always answers the phone
Set the S0 register to 0. ATS0=0
Problem: The communications software displays, "No Dialtone".
Make sure that your phone cable is working properly and that it is firmly seated to the phone socket
at your phone jack and in the rear panel of the modem.
Problem: A high pitched squeal is emitted from the external speakers..
This phenomenon is "feedback" and occurs when the microphone is pointed at the external
speaker or is close enough to pick up the speaker output. This may be remedied by using a
unidirectional microphone, making sure that it is pointed away and as far from the speaker as
functionally possible. Another option is to use a headset with an attached microphone.
On-line Technical Support
If you have access to the World Wide Web be sure to visit the Zoltrix home page
at:
http://www.zoltrix.com
3QF-56KTOMCAT
