Adeunis RF ARF44 사용자 설명서 - 페이지 12

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RF44

User Guide

Powerdown Mode

In powerdown mode, the power consumption is reduced to reach less than

3µA. In this state, the module is not able to receive or transmit any data and

is not able to enter command mode.

The powerdown mode is controlled by pin 4 of the module. This pin is tied to

VCC when in transceiver or command mode. If powerdown mode is not used,

the pin can be leaved unconnected.

The powerdwon mode is entered by driving the powerdown pin to 0V. The

mode is activated by the detection of a high to low transition on this pin. The

powerdown state is reached after a typical delay of about 2ms. The pull up

on the pin is by passed during powerdown to get the better powerdown

consumption.

The powerdown mode is exited by actively driving the powerdown pin to

VCC. The mode is deactivated by the detection of a low to high transition on

this pin. The module is ready for sending new data after a typical delay of

3ms.

AT commands are interpreted only when the transceiver is in

Command mode.

Command: are used to read and update the modem parameters

A command starts with the 2 ASCII 'AT' characters. 'AT' means 'Attention'

follow with one or several characters or other data.

Each command is ended with <cr> (carriage return).

Response: is sent back for each command on the serial link.

The answer is :

'O'<cr> (ASCII character 0x4F) for accepted command (or OK command)

'E'<cr> for error

Specific string when specified

Ref. 08-07-V5-lmn

p. 10

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