SARA-R4/N4 series - AT Commands Manual
UBX-17003787 - R09
15 GPIO
Page 166 of 307
Time
Voltage
V
H
V
L
50
ms
50
ms
Figure 6: GPIO pin progress for registered roaming 3G
15.1.3.7 Registered roaming Cat NB1
• Cyclic Output / High for 100 ms, Output / Low for 100 ms, Output / High for 100 ms, Output / Low for 30 s
Time
Voltage
V
H
V
L
30 s
100
ms
Figure 7: GPIO pin progress for registered roaming Cat NB1
15.1.3.8 Data transmission
• Continuous Output / High
Time
Voltage
V
H
V
L
Figure 8: GPIO pin progress for data transmission
15.1.3.9 Data transmission roaming
• Cyclic Output / High for 800 ms, Output / Low for 200 ms
