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COURIER HIGH SPEED MODEMS
G-2 Additional Operations
CELLULAR OPERATIONS
This function applies to Dual Standard HSTs only. HST cellular
modems can be used to answer or originate calls, but are
proprietary. They can only connect with other U.S. Robotics
Dual Standard modems with HST cellular capabilities.
To enable cellular mode, load the &F3 template settings by
typing the following command:
AT &F3 <Enter>
To save this as your power-on/default setting, type this:
AT &F3 &W <Enter>
The &F3 command sets the serial port rate to 19,200 bps, and
formats the data for 8 bits, no parity and one stop bit. The ini-
tialization string sent to the modem by loading this template is
shown below.
AT B1 X7 S10 = 30 &B1 &L2 &H1 &I0 &R2
• B1enables HST modulation
• X7—displays extended result codes including NO DIAL
TONE, RINGING, NO ANSWER, and BUSY messages
• &B1locks the serial port rate so that it remains higher
than the connection rate.
• S10=30sets the modem to wait 3 seconds after loss of
carrier before hanging up.
• &L2enables cellular mode
• &H1enables hardware flow control
• &I0disables software flow control
• &R2sets the modem so it sends received data to the
computer or terminal when the Ready To Send (RTS)
signal is high, only if the computer or terminal supports
RTS.