Sierra Wireless WISMO218 - Manual (Page 28)

WA_DEV_W218_PTS_002 Rev 005 Page 28 of 109
Product Technical Specification &
Customer Design Guidelines
Power Consumption
Various Operating Modes
There are various kinds of operating modes for the WISMO218 as defined in the table below.
Table 3. WISMO218 Operating Modes
Mode Description
OFF Mode When VBATT power is supplied to the WISMO218 but has not yet been powered ON.
Alarm Mode
When alarm clock is set for the WISMO218 with ALL of the following conditions:

before time is up

with AT + CPOF having been entered from a computer that is connected to the
WISMO218

with the ON/~OFF signal being left open (remains at HIGH level)
Idle Mode
When the WISMO218 has a location update with a live network but with no GSM/GPRS
connection, while the UART interface is in sleep mode
Note 1 .
Connected Mode The WISMO218 has GSM voice codec connection with a live network.
Transfer Mode The WISMO218 has GPRS data transfer connection with a live network.
Note 1 : There are two different methods to enter sleep mode through the AT command setting, AT + PSSLEEP, as
described below:

AT + PSSLEEP = 0
 The entry of sleep mode is controlled by the level of DTR signal and the firmware.
 When DTR (viewed from module side) is of LOW voltage level, the WISMO218 will
never enter sleep mode.
 When DTR (viewed from module side) is of HIGH voltage level, the WISMO218 will
enter sleep mode. To wake the WISMO218 up, it is necessary to toggle the DTR (viewed
from module side) from HIGH to LOW voltage level.
 This method should be applied if the application needs to forbid the entry of sleep mode.

AT + PSSLEEP = 1
 For this method, the entry of sleep mode is controlled just by the firmware.
 When the WISMO218 has had no activities for a certain period of time, it will enter sleep
mode automatically, regardless of the DTR level.
 Any ASCII character on the UART can wake the WISMO218 up.
For details of the AT + PSSLEEP command, please refer to document [2] WISMO218 AT Commands
Manual.
Note that the power consumption level will vary depending on the operating mode used.