9-30-93
    UNIX & XENIX & Terminals & Other NON-PC-non-dos-based applications

     The  defaults for the modem are &C0  &D0, autoanswer OFF. For most  PC
applications  you  set  &C1   &D2.  Unix  and  Xenix  do  not  seem  to  be
standardized. Try combinations;  (AT&F sets defaults)

AT&F                AT&F&C1                  AT&F&D2
AT&F&C1&D2          (some rare cases may want &D3 - see manual)

     If  the  device cannot issue the init string to the modem  each  time,
finish  the line with &W and it will be saved to NV ram so the  modem  will
power-up with that configuration.

AT&F&C1&W    (example)

To set autoanswer to ON the command is S0=1     ATS0=1

     Commands  may  be combined on one line, AT&F at the start, &W  at  the
end.  The  modem will also 'wake up' at the same speed, parity,  bits,  and
stop bit that you were using at that time the AT.....&W command was issued.
So  always use the fastest (up to 19,200) that the modem and  port  support
when you do the AT...&W.  CTS/RTS hardware flow control is default. The  &K
command sets flow control (see the manual).

>>>  On  some devices the &Sx and &Rx may need to be changed  from  default
(see your manual). <<<

     Another  default is E1 (command echo). Many systems prefer not to  get
command echos, so E0 should be included in  the string.

     Systems  which do not want reponses to commands or CONNECT  responses,
include Q1 in the string (default is Q0 to echo responses). Q2 will let the
CONNECT reponses through, but inhibit command responses.

     The %E2 will tel the modem to re-negotate the connection, (protocol  &
speed) while on-line.

    In  working with one SCO Unix user these strings worked.

ANSWER  modem: AT&F&C1E0Q1S0=1 (&W)
calling modem: AT&FQ1S0=0      (&W)

     One Min-computer user reports this works:

ANSWER  modem: AT&FE0&R1S0=1 (&W)   <-- note: these two had to change &R1
calling modem: AT&F&C1&R1    (&W)   <-- from default &R0

     The  &W also saves the 'current' speed, parity, bits and stop bit,  so
the modem will wake-up with those defaults.

     The  default for Zoom 'V' series modems is to use speed-buffering  (on
the  Turbo you need to set S36=7). This means you set your port  at  19,200
when  you set the modem, and when you use the modem.  The modem takes  care
of  modem-modem  speed.  To set BPS (often incorrectly  called  Baud),  you
merely  set the terminal or software in terminal mode at the BPS speed  you
want,  and  type  AT to the modem. This simple procedure  also  sets  Bits,
Parity & stop bit. If you want the modem to 'wake up' at this BPS then type
AT&W.  The modem will stay at this BPS as long as the Terminal or  software
on the computer, does not send an AT command at any other speed.

     To  'lock'  port  modem speed, set the port at  the  speed  you  want.
(19,200  is often best). Set the modem ATS95=0 (default) and  the  software
may  then  either  be set to autodetect speed, or to  turn  autodetect  OFF
(best).  No matter what the carrier speed, when S95=0, the modem  will  say
CONNECT  19200 (or CONNECT 9600 if that was what you set), so the  software
will  not  issue  a command at the carrier speed, but only  at  the  pseudo
CONNECT speed, effectively LOCKING the port and modem.

     When using in Syncronous mode, along with these suggestions, also  see
your modem manual section on Syncronous.

     While  PC cables are always 25-25 straight through type,  some  non-pc
may  need Null-modem cables, where pins 2/3 and 3/4 are swapped. They  MUST
be hardware flow control cables, so an old cable from a 2400 modem may fail.

                                   Don Hinds - Zoom Tech
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