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HSDPA Standard At Commands Page 11 of 60 Version 1.2
AT INTERFACE DESCRIPTION
1.4. Basic Integration
The MM-6280IND supports asynchronous serial communication known as RS-232 or USB.
This chapter describes the basic integration and communication of MT2 with TE2. MT2 hereby defines
MM-6280IND and TE2 means host products which can issue AT commands and handle the response
through UART or USB signalling. The popular examples of TE2 are PC’s, PDA’s and unmanned
systems such as Data Loggers, RTU’s or PLC’s.
1.5. Serial Interface
TE2’s command and MT2’s response pair is the basic interface sequence. The pairs should keep a
pre-defined format and ignore the case of letters unless otherwise specified. MM-6280IND supports 2
serial interfaces, USB and UART. USB and UART serve an AT command set with ASCII character
sequence.
1.6. Command Format
The AT command set in USB and UART is based on ASCII text. The extended AT command set by
Qualcomm start with “AT$QC” and the extended AT command set by C-motech start with “AT$$”. All
commands should finish by <CR>, 0x0d.
Any spaces in the AT command field are ignored and the space in the parameter field should be
removed if it is not necessary unless otherwise specified.
With few exceptions the following syntax provides the given response for each AT command. Where
not applicable the response is ERROR:
Table 2. AT command Format
Command Description
AT***? reads current set value
AT***=? reads supported range of values
AT***=<value> changes current set value to new set value
ASCII commands/ACK AT$$ command = argument
ASCII
responses/notifications
$$command: result
Error(In case of not applicable command, or wrong argument input)
NOTE: *** stands for the specific AT syntax.
1.7. Message Naming Convention