5.3.1.6 Low Power Control or Set Power Down

Table 5-18. Format
Firmware Version 1.0	Firmware Version 1.2 and Later
`SO`,`<0,1>`	`SPD`,`<0,1>`
Note: All firmware version 1.0 syntax remains valid in version 1.2 and later.

Command SO or SPD enables or disables low-power operation of the RNBD350 module. It expects one single digit as the input parameter.

If the input parameter is ‘0’, the RNBD350 module runs without low-power operation and UART is active all the time.
If the input parameter is ‘1’, the RNBD350 module enables Low-Power mode and UART is operational to save power.

It is necessary to wake up UART by pulling the UART_RX_IND (UART RX Indication, PB9) pin low from the host MCU before the host MCU transmits data to the RNBD350 module. The UART_RX_IND (UART RX Indication, PB9) must be active longer than 2 ms prior to UART data to make the RNBD350 module ready to receive data.

Figure 5-2. Wake Up RNBD350 from Sleep Mode Timing Diagram


Item	Firmware Version 1.0 and Later	Description
Default:	`0`	Low-power mode is disabled
Example:	`SO,1`	Set RNBD350 to operate under Low-Power mode
Response:	`AOK`	Success
Response:	`Err`	Syntax error or invalid parameter
Note: The parameter of the `SO or SPD` command is stored in PDS.


Item	Firmware Version 1.2 and Later	Description
Default:	`0`	Low-power mode is disabled
Example:	`SPD,1`	Set RNBD350 to operate under Low-Power mode
Response:	`AOK`	Success
Response:	`Err`	Syntax error or invalid parameter
Note: The parameter of the `SO or SPD` command is stored in PDS.