Integration Manual

SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R13 System description Page 34 of 119
1.13 System features
1.13.1 Network indication
GPIOs can be configured by the AT command to indicate network status (for further details see section 1.11 and the
SARA-R4/N4 series AT Commands Manual [2]):
• No service (no network coverage or not registered)
• Registered / Data call enabled (RF data transmission / reception)
1.13.2 Antenna supervisor
The antenna detection function provided by the ANT_DET pin is based on an ADC measurement as optional feature that
can be implemented if the application requires it. The antenna supervisor is forced by the +UANTR AT command (see the
SARA-R4/N4 series AT Commands Manual [2] for more details).
The requirements to achieve antenna detection functionality are the following:
• an RF antenna assembly with a built-in resistor (diagnostic circuit) must be used
• an antenna detection circuit must be implemented on the application board
See section 1.7.2 for detailed antenna detection interface functional description and see section 2.4.2 for detection circuit
on application board and diagnostic circuit on antenna assembly design-in guidelines.
1.13.3 Dual stack IPv4/IPv6
SARA-R4/N4 series support both Internet Protocol version 4 and Internet Protocol version 6 in parallel.
For more details about dual stack IPv4/IPv6 see the SARA-R4/N4 series AT Commands Manual [2].
1.13.4 TCP/IP and UDP/IP
SARA-R4/N4 series modules provide embedded TCP/IP and UDP/IP protocol stack: a PDP context can be configured
established and handled via the data connection management packet switched data commands.
SARA-R4/N4 series modules provide Direct Link mode to establish a transparent end-to-end communication with an
already connected TCP or UDP socket via serial interfaces (USB, UART). In Direct Link mode, data sent to the serial
interface from an external application processor is forwarded to the network and vice-versa.
For more details on embedded TCP/IP and UDP/IP functionalities, see SARA-R4/N4 series AT Commands Manual [2].
1.13.5 FTP
SARA-R4/N4 series provide embedded File Transfer Protocol (FTP) services. Files are read and stored in the local file
system of the module.
FTP files can also be transferred using FTP Direct Link:
• FTP download: data coming from the FTP server is forwarded to the host processor via USB / UART serial interfaces
(for FTP without Direct Link mode the data is always stored in the module’s flash file system)
• FTP upload: data coming from the host processor via USB / UART serial interface is forwarded to the FTP server (for
FTP without Direct Link mode the data is read from the module’s flash file system)
When Direct Link is used for an FTP file transfer, only the file contents passes through USB / UART serial interface, whereas
all the FTP command handling is managed internally by the FTP application.
For more details about embedded FTP functionalities, see the SARA-R4/N4 series AT Commands Manual [2].
1.13.6 HTTP
SARA-R4/N4 series modules provide the embedded Hypertext Transfer Protocol (HTTP) services via AT commands for
sending requests to a remote HTTP server, receiving the server response and transparently storing it in the module’s
flash file system. For more details, see the SARA-R4/N4 series AT Commands Manual [2].