SARA-R4 series - System Integration Manual
UBX-16029218 - R06
System description
Page 29 of 102
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 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 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 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 series
AT Commands Manual
1.13.4
TCP/IP and UDP/IP
SARA-R4 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 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 series
AT Commands Manual
1.13.5
FTP
SARA-R4 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 a FTP file transfer, only the file content pass through USB / UART serial interface,
whereas all the FTP commands handling is managed internally by the FTP application.
For more details about embedded FTP functionalities see
SARA-R4 series
AT Commands Manual
