3-31-94                           Dumb Mode

     Like  Hayes,  all Zoom/modems are 'smart' modems and  are  'Hayes  AT'
compatible.  They cannot be turned into 'true dumb' modems.  However,  they
can  be  set to turn off certain responses which in most cases is  what  is
actually required. Non V-Series modems highest register is S27.

     DEFAULT settings are listed first.

E1 - echo commands being sent to the modem back to the computer
E0 - do NOT echo back commands

Q0 - sends modem reponses back to the computer
Q1 - do NOT send back any responses
Q2 - Send back originating responses, do NOT send answering responses.

V1 - send respsones as words
V0 - send responses as numbers

X4 -  this command chooses which CONNECT BUSY (etc) responses are sent back
      to the computer. See the manual for other than X4.

&S0 - Force DSR ON
&S1 - sometimes needed in 'dumb'

The following may effect in some situation. * are V-series only

* N1 - connect at any speed           * &K3 - RTS/CTS flow control
  N0 - connect fixed speed              &K0 - none
                                        &K4 - Xon/Xoff
&C0 - DCD forced ON                     &K5 - transparent Xon/Xoff
&C1 - DCD follows carrier
                                      &R0 - tracks RTS signal
&D0 - does nothing w/DTR              &R1 - ignores RTS
&D2 - Hangs up on DTR drop
&D3 =  "    "  and resets

One other thing may help. If the modem must not accept any commands, change
register  S3. default is 13 for carraige return. Something like 126 for the
~  char or 124 for the | char might be a good choice. Be Sure if  you  save
the  change, to write it down so you can change it back later. If it was  ~
then  to change it back just type ATS3=13~  and it will change back to  13.
Most  Zoom/modems won't let you save register 13, so if you use  S3  you'll
have to initialize the modem register 13 each time the modem is turned ON.

                                   Don Hinds - Zoom Tech

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