User Guide

GM500-U1G_A

Hardware Development Guide

Table 2-15Working State of the Network Indicator

LED Status Module status

High level, LED on Module register to networksuccess

Low level, LED off Module not register to network(module is in flight mode or power off)

Low level 1s(LED off), High level 1s(LED on) PDP activated, and get the IP address or Socket established

Figure below is the reference circuit design diagram.



NOTE:

The resistors R11, R12 and R7 in Figures below are only the recommended value and they need to adjust according to the

actual

situation.

Figure 2–28Reference Circuit of the Network Indicator

2.12. POWER_ON/OFF Status Indicator ON_STATE

PIN69(ON_STATE) is used to indicate the status of POWER_ON/OFF

Table 2-16Pin Definition of ON_STATE

Pin Name Pin NO. Description

ON_STATE 69 High level: module power on and ready, it can send/receive AT command.

Low level: module power off/reset state, and can’t send/receive AT command.

The recommend connection mode of this pin are shown as below, you can select one property mode according to you necessary:

Mode 1:this pin is used as GPIO output pin, the MCU can judge the state of module according to the high/low level.

Mode 2:connect this pin to LED to indicate the status of module, the reference circuit you can refer to chapter 2.11.

Mode 3:you can connect this pin to test point when in the development stage.