2.4.7 AT Commands
Communication with cellular modems over the AT command interfaces is done via AT
commands. Modems will typically support many of the 3GPP AT commands for basic
functionality along with their own set of module vendor specific AT commands for
checking network connectivity, transferring data, and performing diagnostics. AT
commands for each modem are documented in their AT command manual, linked to
on their product page.
To send AT commands to the modem open a terminal emulator program, such as
Tera Term, to communicate with the modem.
If you do not have a terminal emulator program, you can download Tera Term here:
https://ttssh2.osdn.jp/index.html.en
Your PC may have multiple COM ports. Select appropriate USB COM port to
communicate with the development kit.
Note:
Your device may not show up on the port list due to a missing driver. Refer to
Section 2.3.1 for instructions on installing a driver.
You may need to adjust the Serial Settings. These can be accessed in Tera Term by
going
Setup>Serial Port
. They can also be updated in Putty by navigating
Connection>Serial.
Serial Settings should be as follows (these are the default
settings):
Baud Rate:
115,200 bps
Data:
8bit
Parity:
none
Stop:
1bit
Flow Control:
none
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