User's Manual

SIM900B EVB User Guide
SIM900B-EVB_UGD_V1.01 13 14.04.2010
3.6 Operating Status LED
Figure 9： StatusLED
Working state of status LED as list:
State Module function
Off Module is not running
64ms On/ 800ms Off
Module does not find the network
64ms On/ 3000ms Off
Module find the network
64ms On/ 300ms Off
GPRS communication
4. Test Interface
Figure 10： Test interface overview