Specifications

LEON-G100/G200 - System Integration Manual
GSM.G1-HW-09002-C Preliminary System description
Page 42 of 75
1.10.1 SIM functionality
The following SIM services are supported:
Abbreviated Dialing Numbers (ADN)
Fixed Dialing Numbers (FDN)
Last Dialed Numbers (LDN)
Service Dialing Numbers (SDN)
SIM Toolkit R99 is supported.
1.11 Serial Communication
1.11.1 Asynchronous serial interface (UART)
The UART interface is an 8-wire unbalanced asynchronous serial interface provided for all communications with
LEON-G100/G200 modules: AT commands interface, GPRS data and CSD data, software upgrades.
The UART interface provides RS-232 functionality conforming to the ITU-T V.24 Recommendation (more details
available in [3]), with CMOS compatible signal levels: 0 V for low data bit or ON state, and 2.85 V for high data
bit or OFF state. An external voltage translator (Maxim MAX3237) is required to provide RS-232 compatible
signal levels. For the detailed electrical characteristics refer to the LEON-G100/G200 Data Sheet [1].
LEON-G100/G200 modules are designed to operate as a GSM/GPRS modem, which represents the data
circuit-terminating equipment (DCE) as described by the ITU-T V.24 Recommendation. A customer application
processor connected to the module through the UART interface represents the data terminal equipment (DTE).
The signal names of the LEON-G100/G200 UART interface conform to ITU-T V.24 Recommendation.
The UART interface includes data lines, hardware flow control lines, modem status and control lines:
RxD: module data output, provides the functionality of the ITU-T V.24 Circuit 104 (Received data)
TxD: module data input, provides the functionality of the ITU-T V.24 Circuit 103 (Transmitted data)
CTS: module hardware flow control output, provides the functionality of the ITU-T V.24 Circuit 106 (Ready
for sending)
RTS: module hardware flow control input, provides the functionality of the ITU-T V.24 Circuit 105 (Request
to send)
DTR: module input, provides the functionality of the ITU-T V.24 Circuit 108/2 (Data terminal ready)
DSR: module output, provides the functionality of the ITU-T V.24 Circuit 107 (Data set ready)
DCD: module output, provides the functionality of the ITU-T V.24 Circuit 109 (Data channel received line
signal detector)
RI: module output, provides the functionality of the ITU-T V.24 Circuit 125 (Calling indicator)
1.11.1.1 UART features
The AT commands that are supported on the module through the UART interface are:
AT commands according to [7].
AT commands according to [8].
AT commands according to [9].
u-blox AT commands.