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MODEM.DOC
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1992-04-02
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3KB
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100 lines
Users
-----
For someone to be able to use the modem port, you MUST have given them a
password. Do an EU and use W to set the password. The user can change
it using the NP command over the modem port.
Modem Settings
--------------
The default settings are: 'T E0 V1 X1 Q0 S7=60 S0=0'
Do not change E0, Q0, V1, X1, or S0. All other settings are fair game.
You can make any changes automatic by putting them in the
INITIALIZE_FILE (see PARMS.DOC)
Modem switches
--------------
You should set your modem to hangup and enter command mode when DTR goes
low. On older modems, this is a hardware switch. On newer modems, it
is a software switch (ATSxx=y type).
Some users have reported intermittent crashes during initialization with
certain modems. A suggested fix is to
ECHO AT&C1&D2 > COMx
before bringing up the BBS. The above line can be put in a BAT file.
Substitute a real com number for the "x" above. This fix will only work
with COM1 and COM2.
User settings
-------------
Recommended user setting for their terminal programs are:
- Half duplex or Echo on -- Program must supply echo of what is being
typed.
Forwarding
----------
A typical forwarding script might be:
PATH AA6 B AA4RE
CT*70,8483865
R*call sign*
SAA4RE
R*password
SMYPASS
Note that this represents a change from previous versions. The CONNECT
message is now taken care of by the code. The system will also change
speed based on the connect message.
High speed modems
-----------------
I have test the BBS with a Telebit T2500 9600bps V.32, V.42bis modem
with good results. Pointers are:
1) I locked the speed of the interface between the modem and the
computer. I also set the "lock_modem_speed" variable to yes in
PARMS.BB. This allows the modem to make whatever speed changes it wants
without have to keep resetting the speed in the BBS.
2) If you have an modem with error recovery or with compression, you
will probably need to set HARDWARE HANDSHAKING on in MBBIOS for the
modem port. See MBBIOS documentation on how to do this. Hint: Its an
item on port definition panel.
3) When connecting to a Non-MNP modem, an MNP modem will try to
negotiate an MNP session. This shows a garbage characters sent to the
distant (non-MNP) end. You may have to change your forwarding scripts
to handle this. Usually you can fix this by adding the following after
the connect line:
R*
S
Remember that all 9600 bps modems are not created equal. There are
multiple implementations and none of them work with each other. The two
most popular are HST and V.32. V.32 is a CCITT standard for 9600 bps.
*** Warning *** Slow computers and some fast ones will get overruns at
9600 bps. An overrun is when the line is delivering data to the
computer faster than the computer can handle. This can be helped by
acquiring a serial port or modem card that has a 16550A chip in it
rather than the 8250 or 16450. The 16550A is plug compatible with the
older chips and includes a 16-byte buffer. You can purchase them for
about $10.
Cabling
-------
The following control lines are used on the modem cable: RTS, CTS, DCD,
DTR, DSR. Your RS-232 cable must have all of these.