User's Manual

Note d‘étude / Technical document :
URD1– OTL 5696.1– 003 / 72361 Edition 02
HILO 3G Application Note
17 January 2011 - Page 25 / 38
After a few seconds, the CTS goes to the active state when the module is ready to receive AT commands.
VGPIO is a supply output from the module that can be used to check if the module is alive.
• When VGPIO = 0V the module is OFF
• When VGPIO = 2.9V the module is ON
Figure 24: Power on sequence
Figure 25: Power off sequence
Send AT COMMAND ―AT+CPOF ― to power off module.
4.2.1.1 IO DC Presence before Power on
When the VBAT is available but the module not yet started, the following I/O's raised their output.
AT+CPOF
CTS
Module Off