User's Manual

Promi-ESD User Manual – Appendix A AT Commands

A-2

Terminology

 AT Command

AT command set is the de facto standard language for controlling modems. The

AT command set was developed by Hayes and is recognized by virtually all

personal computer modems. Promi-ESD provides the extended AT command set

to control and configure the serial parameters and Bluetooth connection.

 AT Response

Promi-ESD replies to AT commands with 4 kinds of message, ‘OK’, ‘ERROR’,

‘CONNECT’ and ‘DISCONNECT’.

 Operation Mode



Mode0: Waiting for AT commands



Mode1: Attempting to connect to the last connected Bluetooth device

 Mode2: Waiting for the connection from the last connected Bluetooth device

 Mode3: Waiting for the connection from any other Bluetooth devices

 Operation Status

 Standby: Waiting for AT commands



Pending: Executing tasks

 Connect: Transmitting data

 Security



Authentication: Pin code (or Pass key)

 Encryption: Data encryption

 Symbols

The symbols are used for the description of command syntax as follows:

Symbol Meaning ASCII Code



Carriage return 0x0D



Line feed 0x0A



Carriage return + Line feed

112233445566 Bluetooth device address

n or m One digit decimal number