LEXI-R422 - System integration manual
UBX-23007449 - R02
Product testing
Page 101 of 108
C1-Public
In addition, module AT commands can be used to perform functional tests on the digital interfaces.
For example (for more details about AT commands, see the AT commands manual
•
Communication with the host controller can be checked by AT command
•
Communication with the SIM card/chip can be checked using the dedCPIN read command
•
Communication with external I2C devices can be checked using dedicated I2C AT commands
•
GPIO functionality can be checked using the dedUGPIOC AT command, etc.
Please contact the u-blox office or sales representative nearest you for further guidelines about OEM
production testing guidelines.
5.2.2.1
“Go/No go” production tests for integrated devices
A “Go/No go” test is typically used to compare the signal quality with a “Golden Device” in a location
with excellent network coverage and known signal quality. This test should be performed after the
data connection has been established. AT+CSQ is the typical AT command used to check signal
quality in term of RSSI. See the AT command manual
for detail usage of the AT command.
☞
These kinds of test ma
y be useful as a “go/no go” test but not for RF performance measurements.
This test is suitable to check the functionality of communications with the host controller, the SIM ,
and the power supply. It can also verify if parts at the antenna interface are well soldered.
5.2.2.2
Persistent configurations
The modules are delivered by u-blox with predefined factory-programmed settings that can be
changed using AT commands according to application-specific requirements. Some settings are
persistent, stored in the module
’
s non-volatile memory, and re-used at any subsequent reboot.
Among these, for example, there are the UART interfaces baud rate, frame format, flow control, etc.,
the greeting text, the MNO profile, the APN for Internet connectivity, etc. For more details, see the AT
command manual
After verifying the proper assembly of the module and related parts on the application device, execute
a persistent configuration setting phase in OEM production line, configuring the module according to
the intended use in the specific application, as the persistent configurations are intended to be set
only once and then re-used at any subsequent reboot.
During the persistent configuration setting phase, it is recommended to configure the baud rate,
frame format, flow control and any other settings for the serial UART interfaces according to the use
case. It is also recommended to configure the greeting text, the MNO profile and the APN for internet
connectivity, etc.. For more details and guidelines regarding persistent configurations of user
settings, see the LEXI-R422 application development guide
