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20 Quick Start and Reference Guide
Type: AT &C0 &W &Y0 and press Enter.
Also make sure that the faxmodem initializa-
tion string does not include &C1.
If your software requires that Data Carrier De-
tect follow carrier, the above considerations
apply in reverse. If you are having problems,
include &C1 in the faxmodem initialization
string.
Problem: The modem speaker volume is too low or too
high.
Solution: If the software allows you to control the
speaker, make sure the speaker is enabled and
set to a comfortable volume.
If the software does not have speaker settings,
add one of the following AT commands to the
initialization string:
L1 for low volume
L2 for medium volume
L3 for highest volume
M0 to turn the speaker off entirely
For example, if you want the volume low and
the software uses the initialization string
AT&F, change it to AT&FL1.
Echo Troubleshooting
Problem: Each character you type either appears
twice or no characters appear at all during
data mode.
Solution: Make sure that your software is in full-duplex
mode when you make a telephone call. If the
remote modem is not also in full-duplex mode,
change to terminal mode, type AT E0, and
press Enter. Then turn on your communica-
tions software’s local echo. Your software now
echoes commands during terminal mode and
any typing performed during data mode.