GPIO pin settings

The GPIO Configuration page configures GPIO pin settings. You can configure GPIO pins configured for one of three modes: serial, input, and output.

• Serial: Use the GPIO pin for standard serial communication signaling. Each pin maps to a different serial signal: DCD, CTS, DSR, and so on. The following table lists the default serial settings for the GPIO pins on a Digi device. Depending on the device, there are five or nine pins.

  Pin Number	Default Serial Signal	Signal Direction
  GPIO 1	DCD	Input
  GPIO 2	CTS	Input
  GPIO 3	DSR	Input
  GPIO 4	RTS	Output
  GPIO 5	DTR	Output
  GPIO 6	TXD	Output
  GPIO 7	RXD	Input
  GPIO 8	TXD for port 2	Output
  GPIO 9	RXD for port 2	Input

• In: Allows input of GPIO signals. Use the GPIO pin for user-defined signal input from the connected device to the Digi device. Alarms are issued when GPIO pins change state. You can use input mode with alarms to trigger email notifications or SNMP traps when a particular signal change is detected, as discussed in Alarms Configuration.
• Input mode: Allows input of GPIO signals.
• Out: Allows output of GPIO signals. You can use the GPIO pin for user-defined signal output from the Digi device to the connected device. You can use this mode to toggle the output of GPIO signals between high and low.