User's Manual

GSM/GPRS Module Series
M85 Hardware Design
M85_Hardware_Design Confidential / Released 62 / 88
3.14. Network Status Indication
The NETLIGHT signal can be used to drive a network status indicator LED. The working state of this pin
is listed in the following table.
Table 22: Working State of the NETLIGHT
A reference circuit is shown as below.
Module
NETLIGHT
4.7K
47K
300R
VBAT
Figure 44: Reference Design for NETLIGHT
3.15. Operating Status Indication
The STATUS pin will output a high level after the module being turned on, but it is not recommended
connecting this pin to a MCU’s GPIO to judge whether the module is turn-on or not. The following LED
indicator circuit for STATUS pin can be used to indicate the state after the module has been turned on.
State
Module function
Off
The module is not running.
64ms On/800ms Off
The module is not synchronized with network.
64ms On/2000ms Off
The module is synchronized with network.
64ms On/600ms Off
The GPRS data transmission after dialing the PPP connection.