Ublox SARA-N2 Series, System Integration Manual

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SARA-N2 / N3 series - System integration manual
UBX-17005143 - R13 System description Page 24 of 95
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1.9 Serial interfaces
SARA-N2 / N3 series modules provide the following serial communication interfaces:
• Main primary UART interface (see 1.9.1 ):
o
In the VCC voltage domain (~3.6 V) on the SARA-N2 series modules, supporting:
▪
AT communication
▪
FW upgrades by means of the FOAT feature
▪
FW upgrades by means of the dedicated tool
o
In the V_INT voltage domain (1.8 V or 2.8 V) on the SARA-N3 series modules, supporting:
▪
AT communication
▪
FW upgrades by means of the FOAT feature
•
Auxiliary secondary UART interface (see 1.9.2 ):
o
Not available on the SARA-N2 modules
o
In the V_INT voltage domain (1.8 V or 2.8 V) on the SARA-N3 series modules:
▪
Not supported by the “00” product versions
• Additional UART interface (see 1.9.3 ):
o
In the V_INT voltage domain (1.8 V) on the SARA-N2 series modules, supporting:
▪
Diagnostic trace log
o
In the V_INT voltage domain (1.8 V or 2.8 V) on the SARA-N3 series modules, supporting:
▪
FW upgrades by means of the u-blox EasyFlash tool
▪
Diagnostic trace log
• DDC I2C-bus compatible interface (see 1.9.4 ):
o
In the V_INT voltage domain (1.8 V) on the SARA-N2 series modules:
▪
Not supported by the “02” product versions
o
In the V_INT voltage domain (1.8 V or 2.8 V) on the SARA-N3 series modules:
▪
Not supported by the “00” product versions
1.9.1 Main primary UART interface
1.9.1.1 UART features
SARA-N2 modules include the RXD , TXD , CTS , RTS pins as main primary UART interface, supporting:
• AT communication
• FW upgrades by means of the FOAT feature
• FW upgrades by means of the dedicated tool
The main characteristics of the SARA-N2 modules primary UART interface are the following:
• Serial port with RS-232 functionality conforming to ITU-T V.24 recommendation [7]
• It operates at VCC voltage level
o
0 V for low data bit or ON state
o
VCC , i.e. ~3.6 V, for high data bit or OFF state
•
Data lines ( RXD as module data output, TXD as module data input) are provided
• The CTS hardware flow control output is not supported by “ 02 ” product version: the CTS output
line can be configured as RING indicator, to signal an incoming message received by the module or
an URC event, or as Network status indicator (for more details see section
1.11 and the SARA-N2 /
SARA-N3 series AT commands manual [4] , +URING, +UGPIOC AT commands),
• The RTS hardware flow control input is not supported by “ 02 ” product version
•
Default baud rate: 9600 b/s (4800, 57600 and 115200 b/s baud rates are also supported)
• Default frame format: 8N1 (8 data bits, No parity, 1 stop bit)