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4.2 Hayes or 'AT' Mode
4.2.1 General concept
Hayes or 'AT' commands comply with Hayes protocol used in PSTN modem standards. This
'AT' protocol or Hayes mode is used to program the modem parameters, based on the following
principle:
A data frame always begins with the 2 ASCII 'AT' characters, standing for
'ATtention';
Commands are coded over one or several characters and may include additional
data.
A given command always ends up with a <CR> Carriage Return
A
T
The only exception to this data-framing rule is the switching command from 'Transparent
Mode' to 'AT Mode'. In this case only, the escape code ('+++' by default) must be started and
followed by a silent time at least equal to the time out. In this case only <AT> and <CR> shall not be
used.
Note: The Time between 2 characters of the same command must be under 10 seconds.
Despite its similarity to standard telecommunication modem, ADCON LC-IND radio modems
remains a radio link modem and is consequently fitted with some particular additional "AT"
commands proper to radio transmission (I.e. Channel choice, reception level, etc).
The modem response is as follow:
Command
Additional command
Modem response
OK
Error
...
<CR>
Code
'0'
'3'
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