N720 Hardware User Guide
Copyright © Neoway Technology Co., Ltd 27
2.6.3 NET_LIGHT
NET_LIGHT can output 1.8 V high level. Do not use it to drive LED directly. Drive the LED with a
transistor instead.
Figure 2-20 LED indicator driven by transistor
LIGHT
N720
10KΩ
VCC
470Ω
4.7KΩ
When the module is running, the LED indicator is driven by the NET_LIGHT pin to indicate different
module status with its various blink behaviors. N720 supports multiple blink style and users can configure
it using AT commands.
2.6.4 DTR
Generally, the DTR pin is used to control sleep mode together with AT commands. Enable the sleep mode
function by AT command. Then pulling DTR low will bring the module into sleep mode if the module is
idle. In this mode, the idle current is less than 4 mA, depending on the DRX setting of network.
In sleep mode, the module can respond to the incoming call, SMS, and GPRS data. The host MCU can
also control the module to exit sleep mode by controlling DTR.
Process of entering sleep mode:
1. Keep DTR high level in normal working mode. Activate the sleep mode by using the
AT+ENPWRSAVE=1 command.
2. Pull DTR low, and the module will enter sleep mode, but only after process and pending data
finished.
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