User's Manual
LISA-U1/LISA-H1 series - System Integration Manual
3G.G2-HW-10002-2 Advance Information System description
Page 41 of 116
1.9 Serial communication
LISA-U1/LISA-H1 series modules provide AT command interface, Packet-Switched / Circuit-Switched Data
communication on the following serial communication interfaces:
One asynchronous serial interface (UART) that provides complete RS-232 functionality conforming to
ITU-T V.24 Recommendation [3], with limited data rate. The UART interface can be used for firmware
upgrade
One Inter Processor Communication (IPC) interface that includes a synchronous SPI-compatible interface,
with maximum data rate of 20 Mb/s
One high-speed USB 2.0 compliant interface, with maximum data rate of 480 Mb/s. The single USB interface
implements 6 logical devices. Each device is a USB communications device class (or USB CDC), that is a
composite Universal Serial Bus device class. The USB interface can be used for firmware upgrade
The LISA-U1/LISA-H1 series modules are designed to operate as an HSPA wireless modem, which represents the
data circuit-terminating equipment (DCE) as described by the ITU-T V.24 Recommendation [3]. A customer
application processor connected to the module through one of the interfaces represents the data terminal
equipment (DTE).
All the interfaces listed above are controlled and operated with:
AT commands according to 3GPP TS 27.007 [4]
AT commands according to 3GPP TS 27.005 [5]
AT commands according to 3GPP TS 27.010 [6]
u-blox AT commands
For the complete list of supported AT commands and their syntax refer to the u-blox AT Commands
Manual [2].
The following serial communication interfaces can be used for firmware upgrade:
The UART interface, using the RxD and TxD lines only
The USB interface, using all the lines provided (VUSB_DET, USB_D+ and USB_D-)
To directly enable PC (or similar) connection to the module for firmware upgrade, provide direct access
on the application board to the VUSB_DET, USB_D+ and USB_D- lines of the module (or to the RxD
and TxD lines). Also provide access to the PWR_ON or the RESET_N pins, or enable the DC supply
connected to the VCC pin to start the module firmware upgrade (see Firmware Update Application Note
[14]).
The following sub-chapters describe the serial interfaces configuration and provide a detailed description of each
interface for the application circuits.
1.9.1 Serial interfaces configuration
UART, USB and SPI/IPC serial interfaces are available as AT command interface and for Packet-Switched / Circuit-
Switched Data communication. The serial interfaces are configured as described in Table 17 (for information
about further settings, please refer to the u-blox AT Commands Manual [2]).