LISA-U1 series - System Integration Manual
3G.G2-HW-10002-3
Preliminary
System description
Page 43 of 125
Interface
AT Settings
Comments
UART interface
Enabled
Multiplexing mode can be enabled by AT+CMUX command providing following channels:
Channel 0: control channel
Channel 1 – 5: AT commands /data connection
Channel 6: GPS tunneling
AT+IPR=115200
Baud rate: 115200 b/s
AT+ICF=0,0
Frame format: 8 bits, no parity, 1 stop bit
AT&K3
HW flow control enabled
AT&S1
DSR line set ON in data mode and set OFF in command mode
AT&D1
Upon an ON-to-OFF transition of DTR, the DCE enters online command state and issues
an OK result code
AT&C1
Circuit 109 changes in accordance with the Carrier detect status; ON if the Carrier is
detected, OFF otherwise
USB interface
Enabled
6 CDCs are available, configured as described in the following list:
USB1: AT commands / data connection
USB2: AT commands / data connection
USB3: AT commands / data connection
USB4: GPS tunneling dedicated port
USB5: 2G and BB trace dedicated port
USB6: 3G trace dedicated port
AT&K3
HW flow control enabled
AT&S1
DSR line set ON in data mode and set OFF in command mode
AT&D1
Upon an ON-to-OFF transition of DTR, the DCE enters online command state and issues
an OK result code
AT&C1
Circuit 109 changes in accordance with the Carrier detect status; ON if the Carrier is
detected, OFF otherwise
SPI interface
Enabled
Multiplexing mode can be enabled by AT+CMUX command providing following channels:
Channel 0: control channel
Channel 1 – 5: AT commands /data connection
Channel 6: GPS tunneling
AT&K3
HW flow control enabled
AT&S1
DSR line set ON in data mode and set OFF in command mode
AT&D1
Upon an ON-to-OFF transition of DTR, the DCE enters online command state and issues
an OK result code
AT&C1
Circuit 109 changes in accordance with the Carrier detect status; ON if the Carrier is
detected, OFF otherwise
Table 18: Default serial interfaces configuration
1.9.2
Asynchronous serial interface (UART)
The UART interface is a 9-wire unbalanced asynchronous serial interface that provides AT commands interface,
PSD and CSD data communication, firmware upgrade.
UART interface provides RS-232 functionality conforming to the ITU-T V.24 Recommendation (more details
available in
ITU Recommendation
[3]), with CMOS compatible signal levels: 0 V for low data bit or ON state, and
1.8 V for high data bit or OFF state. Two different external voltage translators (e.g. Maxim MAX3237E and Texas
Instruments SN74AVC8T245PW) could be used to provide full RS-232 (9 lines) compatible signal levels. The
Texas Instruments chip provides the translation from 1.8 V to 3.3 V, while the Maxim chip provides the necessary
RS-232 compatible signal towards the external connector. If a UART interface with only 5 lines is needed, the
Maxim 13234E voltage level translator can be used. This chip translates the voltage levels from 1.8 V (module
side) to the RS-232 standard. For detailed electrical characteristics refer to
LISA-U1 series
Data Sheet
The LISA-U1 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 the UART interface represents the data terminal equipment (DTE).
