I/O Ports (GPIO)

Nodegrid Gate SR supports two digital I/O ports (DIO0, DIO1), one digital output port (OUT0) and one relay port (1A@24V).

Nodegrid Link SR supports two digital I/O ports (DIO0, DIO1) and two digital output ports (OUT0, OUT1).

DIO0 and DIO1 can be independently configured as input or output. The DIO0 and DIO1 are open-drain digital I/O ports with TTL level (5.5V max @ 64mA). ESD protection exceeds JESD 22.

When DIO port is configured as input:

contact is open, senses High (1)
contact is closed, senses Low (0)

When DIO port is configured as output:

set to high, outputs TTL high
set to low, outputs TTL low

The OUT0 and OUT1 are high voltage digital outputs. Each port is internally attached to a Signal MOSFET. The output port is normally open (NO) and capable of supporting a voltage range from 2.5V to 60V @ 500mA.

When OUT port is set to:

High (enabled/active and pulls OUT to ground)
Low (disabled/inactive and keeps OUT open)

On Nodegrid Gate SR, the RELAY port is normally a closed (NC) relay (rated max value of 24V @ 1A). The RELAY specification supports a maximum switching power of 60W, 125VA; maximum switching voltage of 220VDC, 250VAC; maximum switching current of 2A, with restive load.

The RELAY’s primary function is a Power Source Control Alarm. When closed, it indicates that Nodegrid Gate SR is powered by a single power source or has no power. If the Nodegrid Gate SR is powered by both power input sources, when RELAY is closed, it indicates a FAILURE on at least one power input sources.

(optional), RELAY can be changed to follow software control (Open / Close), to control an external device. Possible relay states are:

open (opens relay contact)
close (closes relay contact)

The I/O Port configuration is under System :: I/O Ports. I/O Port status and other hardware details is under Tracking :: HW Monitor.