Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 59 / 82
Figure 34: RI Behavior as a Caller
Figure 35: RI Behavior of URC or SMS Received
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.
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.