Ublox LENA-R8 Series, System Integration Manual

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LENA-R8 series - System integration manual
UBX-22015376 - R02 System description Page 28 of 116
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The RS-232 / ITU-T V.24 functionality over virtual logical lines is not supported over the USB interface.
The USB interface is controlled by the AT commands documented in the AT commands manual [2] .
The USB interface of LENA-R8 series cellular system provides the following USB functions:
• Virtual serial port over USB for AT commands and data communication
• Virtual serial port over USB for GNSS data tunneling
• Virtual serial ports over USB for Diagnostic logs
• RNDIS for Ethernet-over-USB
• CDC-ECM for Ethernet-over-USB
LENA-R8 series cellular system has the following VID (Vendor ID) and PID (Product ID) as USB device
in the default factory-programmed normal operating mode:
• VID = 0x1782
• PID = 0x4D10
The following vendor-specific virtual serial ports are enumerated
• USB serial port 0: AT commands and data communication
• USB serial port 1: Reserved
• USB serial port 2: Reserved
• USB serial port 3: Diagnostic log (CP)
• USB serial port 4: Diagnostic log (AP)
• USB serial port 5: GNSS data tunneling
• USB serial port 6: Reserved
• USB serial port 7: Reserved
The default factory-programmed configuration of the USB interface can be changed by dedicated AT
command to include the RNDIS or the CDC-ECM function for Ethernet-over-USB capability in addition
to the vendor-specific virtual serial ports listed above, with change in the USB PID.
The USB interface is compatible with standard Linux/Android USB kernel drivers. The capability and
configuration of the USB interface
can be reported by running “lsusb - v” or an equivalent command
available in the host operating system when the USB of the cellular system is connected.
☞
The USB_BOOT input pin must be set high, at the 1.8 V voltage level of the V_INT supply output,
to enable the FW update by the dedicated tool over the USB interface of the LENA-R8 series
modules
’ cellular system. Only if the USB_BOOT pin is left floating (unconnected), or it is set low
(grounded), LENA-R8 series modules ’ cellular system can boot in normal operating mode.
LENA-R8 series cellular system has the following VID (Vendor ID) and PID (Product ID) as USB device,
if the FW download mode over USB is set (
USB_BOOT input pin set high, at the 1.8 V voltage level of
the V_INT supply output):
• VID = 0x0525
• PID = 0xA4A7
☞
It is highly recommended to provide access to the VUSB_DET , USB_D+ , USB_D- and USB_BOOT
pins of LENA-R8 series modules ’ cellular system for FW update and for diagnostic purpose, by test
points directly connected to the pins.
1.10.3 Cellular I2C interface
LENA-R8 series modules include an I2C bus compliant interface ( SDA and SCL pins), available for
• communication with external u-blox GNSS chips / modules (LENA-R8001 only),
• communication with other external I2C devices, as audio codecs.