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COURIER HIGH SPEED MODEMS
E-2 Troubleshooting
3. Check to see that your terminal or software is set to the
correct bit rate and word length (7 bits with or without a
parity bit, or 8 bits and no parity). If you're using a
computer, make sure your software is set to the correct
communications port.
4. Check that DIP switch 8 is ON, for command set
recognition. If the switch is OFF, power off the modem, set
the switch ON, and power on the modem again. Try typing
AT <Enter> again.
5. Check that DIP switch 3 is ON, for result code display, and
that DIP switch 2 is OFF, for verbal result codes. If not,
change the switch(es) and type ATZ <Enter>. Or type
whichever of these commands is needed:
ATQ0 <Enter> (to enable the message)
ATV1 <Enter> (to display a verbal message)
6. Review your communications software manual to see what
Carrier Detect (CD) operations your software requires.
Then check to see if DIP switch 6 is set correctly.
7. A rare condition is that your terminal or computer reverses
the send/receive functions at the RS-232 interface. See your
equipment documentation.
Displays double characters
Both your modem's and software's local echo are on. You can
turn your software's local echo off. Or turn the modem's echo
off by either resetting DIP switch 4 and sending the modem the
ATZ command, or by sending the modem the ATE0 command.
Your computer . . .
Reacts as though a data link has been established, but no call has
been received
DIP switch 6 is set ON at the factory for Carrier Detect (CD)
override, but your system may require that the override be
turned OFF.
Review your terminal's manual or your communications
software manual to see what CD operations are required. Then
check to see if DIP switch 6 is set correctly.