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UNIX
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1994-04-07
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97 lines
4-6-94
UNIX & XENIX & Terminals & Other NON-PC-non-dos-based applications
(including pay telephones, remote controller or other)
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). DTR delay is controlled by S25. S38 can be increased to
keep the modem from hanging up due to DTR dropping.<<<
When using &Q2 also include E0Q1 in the same line (see below).
Another default is E1 (command echo). Many systems prefer not to get
command echos, so E0 should be included in the string.
DUMB MODE > 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. You
can also trick the modem so it will not accept any commands. Change the S
register 3 from ASCII 13 the carraige return character to something else,
perhaps the ASCII 61 for the '=' sign. Then any time YOU need to change a
setting, you can type ATxxxx= and it will do the change.
The %E2 will tel the modem to re-negotate the connection, (protocol &
speed) while on-line.
If you are having sending BREAK or BUFFER (getting empty) problems,
try \K0 - \K4 (\K5 is default).
In working with one SCO Unix user these strings worked.
ANSWER modem: AT&F&C1E0Q1S0=1 (&W)
calling modem: AT&FQ1S0=0 (&W)
One Mini-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 SUN system with a Systech MTI board requires a special cable (see
you manual "Adding hardware to your system"). Following that diagram should
be about 8 pages with information for setting the modem and the Unix.
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.
The pins are standard RS-232. While PC cables are always 25-25
straight through type ( or 25-9pin), 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. On 2400 non-
V modems only pins 2-8 and 20 'may' be used.
Don Hinds - Zoom Tech
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