Motorola Mobility LLC T56KT1 User Manual

G30 includes three completely independent serial communications interfaces, which may be used 
by the application for several purposes.

The G30 UART is a standard 8-signal bus. The primary UART is used for all the communications 
with G30 - AT commands interface, GPRS data and CSD data, programming and software 
upgrades.

The UART signals are active low CMOS level signals. For standard RS232 communications with 
a PC, an external transceiver is required.

G30 is defined as a DCE device, and the user application is defined as the DTE device. These 
definitions apply for the UART signals naming conventions, and the direction of data flow, as 
described in 

.

The G30 UART supports baud rates 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 
115200, and 230400 bps.

Auto baud rate detection is supported for baud rates up to 230400 bps.

All flow control handshakes are supported: hardware, software, or none.

Parity bit and Stop bit definitions are also supported.

The UART default port configuration is 8 data bits, 1 stop bit and no parity, with hardware flow 
control and auto baud rate detect enabled.

The G30 UART will not send data over the serial interface in case the DTR and/or 
RTS input signals are disabled (set high). Therefore, regardless of the handshake 
method, it is still required to enable these signals for proper operation, by asserting 
them low.