Huawei MG323 manual Output Signal Control Pin, Application Device, Working or Network Status

HUAWEI MG323 GSM M2M Module
Hardware Guide	Description of the Application Interfaces

Figure 3-6Connections of the TERM_ON and RESET pins

RESET

HUAWEI Module (Modem)

TERM_ON

10 nF

10 nF

c

e

c

e

b2.2 kΩ

b2.2 kΩ

Application Device

(Host）

3.5.3Output Signal Control Pin

The MG323 module provides a network status LED pin LED_STATUS. The pulse signal output through this pin controls the status LED on the user interface board to display the network status.

Different blinking modes of the status LED indicate different network status. Table 3-5describes the status of the LED_STATUS pin.

Table 3-5Status of the LED_STATUS pin

Working or Network Status	Output Status of the LED_STATUS Pin
Sleep mode	A low-level signal is output continuously.
Network-searching or non-network	A high-level signal is output for 0.1s in a
status (including the case when the	period of 1s.
SIM card is not inserted and the case
when the PIN number is unblocked)
Registered with a 2G network	A high-level signal is output for 0.1s in a
	period of 3s.
GPRS data service	A high-level signal is output for 0.1s in a
	period of 0.125s.
Voice call	A high-level signal is output
	continuously.

In practical application, the LED_STATUS pin cannot be directly used to drive the status LED. The LED_STATUS pin needs to be used with a triode. To select a suitable current-limiting resistor for the LED, check the actual voltage drop and rated current of the LED. Figure 3-7shows the driving circuit.

Issue 06 (2013-06-13)	Huawei Proprietary and Confidential	22
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