XPLR-IOT-1 - User guide
UBX-21035674 - R02
Platform description
Page 14 of 39
C1-Public
3.3
Serial subsystem
The Serial subsystem within XPLR-IOT-1 provides a flexible scheme that allows either a PC host or
NORA-B1 to connect to each of the modules through software control.
shows the USB and serial port subsystem connections. Blue lines indicate USB connections.
Black lines indicate logical UARTE connections.
NINA-W156 and SARA-R510S UART signals are connected to independent GPIO pads on NORA.
UARTE assignments to GPIO pads are configured by the application at the time of connection to the
respective module. See
and the schematic at
for GPIO assignments.
Figure 8: Serial subsystem
NORA-B1 outputs GPIO control signals to select whether NORA-B1 or the USB-UART port connects
to either NINA-W15 or MAX-M10
–
defaults are to the USB-UART ports. NORA-B1 has a dedicated
connection to SARA-R5.
This configuration allows each of the product center control programs, including s-center
, and u-center
, to bypass NORA-B1and communicate directly to the respective
module.
describes the UART control signals and states for NINA-W15 and MAX-M10 modules.
Signal
State
NINA-W15
MAX-M10
NORA_MAX_COM_EN
Low (default)
USB-UART Interface 2
-
NORA_MAX_COM_EN
High
NORA-B1 UARTE2
-
NORA_NINA_COM_EN
Low (default)
-
USB-UART interface 3
NORA_NINA_COM_EN
High
-
NORA-B1 UARTE3
Table 6: UART selection for NINA-W15 and MAX-M10
