Swarm M138 - Page 48

Examples:
Querying the GPIO1 pin mode:
$GP ?*08
$GP 7*00
The GPIO1 pin mode is set to Output, low while transmitting. Otherwise output is high.
Setting the GPIO1 pin mode to input and wake on a high-to-low transition:
$GP 2*05
$GP OK*33
Sets the GPIO1 pin mode to input and wake on a high-to-low transition.
November 2021 Swarm M138 Modem Manual - Rev 1.00 48/77