The Cricket listener provides data in ASCII format to software running on the attached host over an RS232 interface. The serial command interface parameters are:
| Transmission speed | 115200 bits/second |
| Data format | 8 bits, no parity |
| Flow control | Xon/Xoff (``software'') |
| Stop bits | 1 |
The ASCII-based serial port command interface is similar to the ``AT'' command interface that modems use. The command interface is accessible using standard utilities like HyperTerminal or minicom. Section 1.2 describes how to use these utilities to send commands to Cricket.