Huawei MG323 manual Input Signal Control Pins, Pin No, Signal Name, Description

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

Network status LED (LED_STATUS) pin

Table 3-4lists the pins on the signal control interface.

Table 3-4Pins on the signal control interface

Pin No.	Signal Name	I/O	Description
20	TERM_ON	I	Pin for controlling power-on and power-off
22	RESET	I	Pin for resetting the hardware
25	LED_STATUS	O	Pin for network status LED

3.5.2Input Signal Control Pins

The MG323 module implements power-on and power-off and resets the hardware through the input signal control pins.

The TERM_ON pin is used to implement power-on and power-off. If the TERM_ON pin is pulled down for 1 second to 2 seconds, the module is powered on; if the TERM_ON pin is pulled down for 1 second to 2 seconds again, the module is powered off.

The RESET pin is used to reset the hardware. When the software stops responding, the RESET pin can be pulled down for at least 10 ms to reset the hardware.

As the RESET and TERM_ON signals are relatively sensitive, it is recommended that you install a 10 nF capacitor near the RESET and TERM_ON pins of the B2B interface for filtering. In addition, when you design a circuit on the PCB of the interface board, it is recommended that the circuit length not exceed 20 mm and that the circuit be kept at a distance of 2.54 mm (100 mil) at least from the PCB edge. Furthermore, you need to wrap the area adjacent to the signal wire with a ground wire. Otherwise, the module may be reset due to interference.

Figure 3-6shows the connections of the TERM_ON and RESET pins.

Issue 06 (2013-06-13)	Huawei Proprietary and Confidential	21
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