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, the codes can be
disabled by adding E0 Q1 to the modem configuration string.
Problem: No echo from modem
This is normally caused by an I/O address or IRQ conflict. Verify that the COMPort is not
in use by any other serial device and if necessary use another COMPort or I/O address
setting.
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 require 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.
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
