Specifications

Chapter 2 – AT Commands Overview
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide 13
Response with data:
AT+CGMI<CR>
<CR><LF>+CGMI: WAVECOM MODEM<CR><LF>
<CR><LF>OK<CR><LF>
Result code only:
AT<CR>
<CR><LF>OK<CR><LF>
Parameter Defaults
When applicable, this document identifies default parameter values. Note that within the modem, parameter
values can be either persistent or not persistent. Parameter settings that are NOT persistent are not saved over
a power cycle; therefore, for every power cycle this type of parameter will be reset back to a predefined value.
This predefined value is the listed default.
Values that are persistent are in fact saved over a power cycle. Therefore, the value when the modem is
powered on will be set to the value during the previous power cycle. The default value that is listed for
persistent parameters is the value the modem defaults to when the modem is created at the factory.
Unsolicited Message Syntax
The modem can notify the application of events as they occur. There are two types of unsolicited messages:
those that the modem will always report and those that are optional.
The format for unsolicited messages is:
<CR><LF>+WIND: 4<CR><LF>
As a general rule, unsolicited messages are not embedded in an AT command response. The unsolicited message
may be returned after an AT command is issued and before the AT command response, but not in the middle.
Therefore, the following is NOT possible:
AT+CGMI<CR>
<CR><LF>WAVEC<CR><LF>RING<CR><LF>OM<CR><LF>
<CR><LF>OK<CR><LF>
However, the following example is possible:
AT+CGMI<CR>
<CR><LF>RING<CR><LF>
<CR><LF>+CGMI: WAVECOM MODEM <CR><LF>
<CR><LF>OK<CR><LF>
It is strongly recommended to design the host application parser to ignore unrecognized unsolicited messages.
Such a design allows for modifications to the returned unsolicited messages for testing purposes and possible
future enhancements to the modem. Unsolicited messages are discarded while the modem is in 32khz sleep.
Unsolicited messages can be buffered under certain conditions. The buffer is 15 entries deep and when full will
drop the oldest messages for a new message. To control the unsolicited message continue, use AT+WUSLMSK.
AT commands are buffered in PPP and TCP online data. We recommend that during buffering that the level of
unsolicited messages be dropped back as far as possible; the Ring Indicator can be used as a replacement for
many unsolicited messages.