Telegesis ETRX357-LR - 2 AT Style Command Conventions; 2.1 Parameters

R309 AT Commands
©2015 Telegesis (UK) Ltd - 7 - AT Command Manual (Rev 3.09)
2 AT Style Command Conventions
To simplify the communication with the modules, an AT-style command set, similar to the industry
standard Hayes modem control language, is used.
Each command must be preceded by the "AT" or "at" prefix. To terminate a command enter
<CR>. Any data not following this pattern is either not accepted by the module or will cause an
error message in response. Every command must be terminated with a <CR>, they cannot be
concatenated.
Commands are followed by an optional response that includes <CR><LF><Response><CR><LF>
and/or a prompt <CR><LF><Prompt><CR><LF> where the prompt could also be an error
message.
Example:
ATS00?<CR>
<CR><LF>FFFF<CR><LF>
<CR><LF>OK<CR><LF>
It is recommended to wait for an “OK” or “ERROR:XX” prompt before issuing the next command.
Any data which is prompted to the user is delivered in the format <CR><LF><prompt><CR><LF>.
Unless disabled in S0E or S0F prompts may appear whenever the corresponding event occurs.
Example:
<CR><LF><BCAST:000D6F000005A666,04=test><CR><LF>
A prompt intersecting a command being entered will not affect the command itself.
Throughout this document, only the responses and prompts are presented, <CR><LF> are omitted
intentionally. Sequences of AT commands in a single line are not supported.
The ETRX357 features a 128-byte FIFO to buffer incoming characters from the host processor,
which is sufficient to hold even the longest possible command. The ETRX357 features a 256-byte
FIFO buffer for incoming radio messages, which allows rapid reception of multiple messages
without loss of characters. To prevent a buffer overflow XON/XOFF handshaking is used. Optional
hardware handshaking can be enabled as described in the register description of S12 in section 4.
Read Command
ATXXX?
Commands ending with a ‘?’ return the currently set value of the
parameter or parameters
Write Command
ATXXX=<…>
This command sets user-definable parameters as indicated by
the ‘=’ sign.
Execute Command
ATXXX
This command executes routines of the module and returns
parameters
Table 1: Types of AT commands
When bit 7 of S12 is set each individual reply or prompt is additionally started with the STX and
ended with the ETX character to aid the interpretation of the incoming strings on a host processor.