Gpio Pins - Digi TS 8 MEI User Manual

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.
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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.
Pin Number
GPIO 1
GPIO 2
GPIO 3
GPIO 4
GPIO 5
GPIO 6
GPIO 7
GPIO 8
GPIO 9
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.
Default Serial Signal
DCD
CTS
DSR
RTS
DTR
TXD
RXD
TXD for port 2
RXD for port 2
C o n f i g u r e D i g i d e v i c e s
Signal Direction
Input
Input
Input
Output
Output
Output
Input
Output
Input
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