Document #2400
		     Modem will not Communicate
Check the following steps, in order, if your modem will not communicate in
either AT or SX mode:
1.)If the Power light is not Green, check the transformer or press the power
   button.

2.)If the Test light {TST} is solid Red, reset the modem. If it is again Red
   after the reset, this indicates a component failure.

3.)Is the DTR light Red? If not, you may
   (a) have a loose or defective cable,
   (b) be plugged into the incorrect serial or even a parallel port, or
   (c) have the COM port set incorrectly in the software.

4.)Do you see any activity on the TXD/RXD lights on the modem when a
   keystroke is entered? This indicates the commands may not be getting to the 
   modem. Check items a through c in the last example.

5.)Check the switches on the modem - in most cases default switch settings
   can be used. These can be found in your documentation or on FAXconnection or 
   BBSconnection.

6.)Specifically check the A/S button on the front of all AX modems to make
   sure it is Out.

7.)Make sure the modem is not in DUMB mode; this is controlled by front
   switch 8 Up.

8.)Power down the modem or reset it, then try sending commands again.

9.)Try sending ATQ0E1 to modems in AT mode.

10.)Try another speed on the device you are using to access the modem.

11.)For WYSE-type terminals, make sure that you are forcing CD high through
    switches (for example, put front switches 6,7 Up on the QX/4232bis to set 
    AT&C0).

12.)Try another software package such as Windows Terminal to try and issue
    commands.

13.)On a DOS-based machine, you can create a file through the DOS editor.
    Insert an AT command in it and then Copy it to the correct COM port. For 
    example, create a file and insert the command ATDT1111111. Now copy it to 
    the serial port by typing {COPY DIAL COM2}. The modem's TXD light should 
    light up and you will hear it dialing.

14.)Try another working modem or try this modem on another DTE device.

15.)Switch power supplies.