Bob Sturgeon wrote in a message to David Bowerman:
 BS> Well, it certainly looks like I put my foot in my big mouth this
 BS> time. I had never tried the "F" parameters and was just quoting
 BS> from an online document entitled "AT COMMAND SET SUMMARY FOR
 BS> LOGICODE MODEMS".  Now I have gone and tried the commands and only
 BS> "F1" is acceptable, all the others (from F2 to F18) are rejected as
 BS> an ERROR, including the default of "F0"!!!  I have no idea what
 BS> "F1" does either :-((
Going by the standard AT command set, ATF1 would turn on-line echo off (full 
duplex mode) while ATF0 should enable on line echo -- when a character is 
sent to the modem, it is echoed back to your system as well as being sent to 
the remote system.
Regards,
       David
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