5.11 Serial Data Interfaces

The serial channels consist of two UARTs and a USB port. These provide communication links to the application or accessory units.

The serial channels can be used in differing configurations, depending upon the users requirements and application. However, the common configuration options are described:

•UART1 has full RS-232 functionality and is used for all on- and off –line communication (modem sleep & wake functional control is an integral component of this interface). Its intended use is that of the primary command (AT) interface.

•UART3 behaves as a general-purpose serial data link. It can be used for data logging and de-bugging purposes. A GPS device can be used with UART3 as part of an embedded application.

•The USB port provides a convenient general purpose peripheral (slave) port for use with host devices which have USB controllers.

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