User Manual

Table Of Contents
SARA-R4 series-AT commands manual
UBX-17003787 - R16
16GPIO
Page 191 of 401
Time
Voltage
V
H
V
L
30 s
100
ms
Figure 7: GPIO pin progress for registered roaming NB1 / NB2
16.1.3.8Data transmission
Continuous Output / High
Time
Voltage
V
H
V
L
Figure 8: GPIO pin progress for data transmission
16.1.3.9Data transmission roaming
Cyclic Output / High for 800 ms, Output / Low for 200 ms
800 ms
200 ms
Time
Voltage
VH
VL
Figure 9: GPIO pin progress for data transmission roaming
SARA-R4 / SARA-N4
When registered on 4G (LTE) network, the GPIO pin progress is the same as for data transmission (Figure
8) because a PDP context/EPS bearer is available.