User`s guide

Configure Digi devices

GPIO pins

All Digi Connect Family devices except Digi Connect SP and Digi Connect Wi-SP have several

General Purpose IO (GPIO) pins. In normal operation, GPIO pins are used for the serial signals

CTS, DCD, DSR, DTR, and RTS. On Digi Connect EM and Wi-EM, both sets of RXD/TXD

signals are also configured. These GPIO pins can be used for either standard serial communication

signalling or a user-defined purpose, such as when a significant event occurs in the device. In the

latter case, the Digi device can be configured so that when an event occurs, an alarm is sent as an

email message to an administrator or technician, or as an SNMP trap. The number of GPIO pins

varies by device. Digi Connect ME and Wi-ME devices have five GPIO pins, while Digi Connect

EM and Wi-EM devices have nine GPIO pins. The configuration and current state of GPIO pins

can be easily viewed through the web interface or by issuing commands from the command line.

GPIO pin settings

The GPIO Configuration page configures GPIO pin settings. GPIO pins can be configured for one

of three modes: serial, input, and output.

 Serial: The GPIO pin is used for standard serial communication signalling. Each pin

maps to a different serial signal: DCD, CTS, DSR, etc. Default serial settings for the

GPIO pins on a Digi device follow. Depending on the device, there are five or nine pins.

 In: Allows input of GPIO signals. The GPIO pin is used for user-defined signal input

from the connected device to the Digi device. Alarms can be issued when GPIO pins

change state. Input mode is used in with alarms to trigger email notifications or SNMP

traps when a particular signal change is detected, as discussed in "Alarms" on page 95.

 Input mode: allows input of GPIO signals.

 Out: Allows output of GPIO signals. The GPIO pin is used for user-defined signal

output from the Digi device to the connected device. This mode can be used to toggle

the output of GPIO signals between high and low.

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