COURIER HIGH SPEED MODEMS
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
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
•B1⎯enables HST modulation
•
•&B1⎯locks the serial port rate so that it remains higher than the connection rate.
•S10=30⎯sets the modem to wait 3 seconds after loss of carrier before hanging up.
•&L2⎯enables cellular mode
•&H1⎯enables hardware flow control
•&I0⎯disables software flow control
•&R2⎯sets 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.
