User's Manual

Smart Machine Smart Decision

SIM7100A_User Manual_V1.01 2014-12-11

3.12 Network status

GPIO1 is used to control Network Status LED; application circuit is shown below.

Figure 30: Application circuit

Note: The value of resistor Rx depends on LED characteristic.

Table 33: LED status

LED Status Module Status

Always On Searching Network/Call Connect

200ms ON, 200ms OFF Data Transmit

800ms ON, 800ms OFF Registered network

Off Power off / Sleep

3.13 Flight mode control

GPIO4 controls SIM7100A module to enter or exit the Flight mode. In Flight mode, SIM7100A closes RF

function to prevent interference with other equipments or minimize current consumption. Bidirectional

ESD protection component is suggested to add on GPIO4.