Sony Ericsson GM48, GM47 manual UART2 TD2, RD2

GM47/GM48 INTEGRATOR’S MANUAL

Data Terminal Ready (DTR)

DTR indicates that the DTE is ready to receive data. It also acts as a hardware ‘hang-up’, terminating calls when switched high. The signal is active low. You can define the exact behaviour of DTR with an AT command.

Data Carrier Detect (DCD)

DCD indicates that the DCE is receiving a valid carrier (data signal) when low.

Ring Indicator (RI)

RI indicates that a ringing signal is being received by the DCE when low. You can define the exact behaviour of RI with an AT command.

Data Set Ready (DSR)

No DSR signal is provided. Use any DGND connection for this functionality.

2.8.4 UART2 - TD2, RD2

UART 2 consists of a full duplex serial communication port with transmission and reception lines.

This communication port works in a mode called Operation and Maintenance.

Operation and Maintenance mode works in combination with the SERVICE signal. Two events are possible if the SERVICE signal is active when the module is turned on. These are:

•the module is reprogrammed if UART2 is connected to a computer running Sony Ericsson update software;

•the module enters logging mode and sends data to UART2 if no reprogramming information is received.

Timing and electrical signals characteristics are the same as for

UART1, TD and RD.

Transmitted Data 2 (TD2)

TD2 is used by the application to send data to the module via UART2.

It has the same electrical characteristics as TD.

Received Data 2 (RD2)

RD2 is used to send data to the application via UART2. It has the same electrical characteristics as RD.

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