Smart Machine Smart Decision
SIM521x EVB User Guide
11.04.2011
14
4.6 Operating Status LED
Figure 8: Status LED
Table 8: Network status LED
D301 Status
Module Status
Off
Module is not running
On
Module is running, or voice call is connected
800ms On/ Off
Module find the network and registered
200ms On/ Off
Data communication
Table 9:
Power indicator LEDs
LED
I/O
Description
GPIO3 (D101)
O
ADAPTER power indicator
GPIO5 (D103)
O
USB power indicator