Output Signal Control Pin - Huawei MG301 Hardware Manual

HUAWEI MG301 B2B Module
HardwareGuide
Figure 3-6 Connections of the TERM_ON and RESET pins
HUAWEI Module

3.5.3 Output Signal Control Pin

The MG301 B2B 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 3-5
describes the status of the LED_STATUS pin.
Table 3-5 Status of the LED_STATUS pin
Working or Network Status
Sleep mode
Network-searching or non-network
status (including the case when the
SIM card is not inserted and the case
when the PIN number is unblocked)
Registered with a 2G network
GPRS data service
Voice call
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 3-7 shows the driving circuit.
RESET
10 nF
(Modem)
TERM_ON
10 nF
Description of the Application Interfaces
c
2.2 kΩ
b
e
c
2.2 kΩ
b
e
Output Status of the LED_STATUS Pin
A low-level signal is output continuously.
A high-level signal is output for 0.1s in a
period of 1s.
A high-level signal is output for 0.1s in a
period of 3s.
A high-level signal is output for 0.1s in a
period of 0.125s.
A high-level signal is output
continuously.
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Issue 06 (2013-06-13)
Application Device
(Host）
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