SARA-R4/N4 series-AT Commands Manual
UBX-17003787 - R09

15GPIO
Page 164 of 307
See the corresponding module system integration manual for the complete overview of all allowed
configurations.
15.1.3î™–î™–î™–î™–Network status indication
When a GPIO pin is configured to provide network status indication, its progress depends on the CS network
registration state (see +CREG) and on the module transmission state:
• No service: indicates no network coverage or not registered state
• Registered home network 2G: indicates registered state on home network in 2G RAT
• Registered home network 3G: indicates registered state on home network in 3G RAT
• Registered home network Cat NB1: indicates registered state on home network in Cat NB1
• Registered roaming 2G: indicates registered state with visitor 2G network (roaming in 2G RAT)
• Registered roaming 3G: indicates registered state with visitor 3G network (roaming in 3G RAT)
• Registered roaming Cat NB1: indicates registered state with visitor Cat NB1 network (roaming in Cat NB1)
• Data transmission: indicates voice or data call active either in 2G, 3G or 4G RAT
• Data transmission roaming: indicates voice or data call active either in 2G, 3G or 4G RAT with visitor network
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.
The following figures report the allowed progresses for GPIO pin set as network indication: V
H
and V
L
values
are provided in the corresponding module data sheet in the "Generic Digital Interfaces pins" section.
15.1.3.1î™–î™–î™–î™–No service (no network coverage or not registered)
• Continuous Output / Low
Figure 1: GPIO pin progress for no service
15.1.3.2î™–î™–î™–î™–Registered home network 2G
• Cyclic Output / High for 100 ms, Output / Low for 2 s
Figure 2: GPIO pin progress for registered home network 2G
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