US Robotics COURIER - Page 168

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COURIER HIGH SPEED MODEMS
the guidelines on using the &Band &H commands (Chapter
3 or, in more detail, Chapter 4) and the &W command
(Chapter 5).
2.
Send the modem the following command:
AT &81 &S2 &H1 &L 1 &W <Enter>
&Bl fixes the modem's computer interface rate at 19.2K bps.
&S2 causes
the modem to send a Clear to Send (CTS) signal
only after it sends the Carrier Detect (CD) signal, that is, only
after it connects with the remote modem. (See the note that
follows.) &H1 enables hardware (CTS) flow control.
&L1 forces the modems off hook at power on and enables
them to re-establish the connection should it be broken. &W
writes the settings to nonvolatile memory (NVRAM) as
power-on defaults.
NOTE: We recommend using the &S2 setting, to delay CTS
until after the connection is made, as a precaution. If the
modems are in the process of connecting or reconnecting,
the Courier interprets any keyboard data entry, including an
accidental key stroke, as a key-press abort, and hangs up.
Delaying CTS until after carrier detection prevents this from
happening, for example, if you are typing data to the remote
modem when the modems momentarily disconnect and
begin to reconnect. However, you have to set the modem for
hardware flow control, &H1.
If your software or machine does not support Clear to Send
(CTS), don't include &S2 and &H1 in the command string
suggested above. Follow the Transmit Data flow control
(&H) guidelines in Chapter 4. But keep in mind that if the
modems fail to connect or reconnect, the reason could be a
key-press abort.
3.
Set the modem to load NVRAM settings at power-on, DIP
switch 10 OFF. It does not matter if the modem is in Dumb
or Smart mode (DIP switch 8).
4. Decide which modem is to be the calling modem and which
the answering modem. Set the answering modem to Auto
Answer, DIP switch 5 OFF, and the calling modem to Auto
Answer suppressed, DIP switch 5 ON.
Fax and Other Operations E-17