Connecting Devices To The Auxiliary Output Signals - Matrox Indio Installation And Hardware Reference

24 Chapter 2: Hardware installation

Connecting devices to the auxiliary output signals

Matrox Indio auxiliary output signals can be interfaced with input modules (both
NPN and PNP) found on most programmable logic controllers (PLCs) and other
devices. The auxiliary output signals can also be interfaced with inductive load
devices (such as a relay or a small motor) and TTL devices.
The Matrox Indio auxiliary output signals are NPN open-collector output signals.
Unless in TTL mode
a sourcing device because on their own, they are not capable of providing voltage
to drive a device. When an auxiliary output signal is on, the circuit between its
AUX_OUT+ and AUX_OUT- pins is closed, allowing current to flow from the
AUX_OUT+ pin to the AUX_OUT- pin, if the AUX_OUT+ pin is attached to
a power source or a sourcing device. When an auxiliary output signal is off, the
circuit between the AUX_OUT+ and AUX_OUT- pins of the signal is opened
and no current flows through.
1. In TTL mode, when an output signal is on, pullup circuitry internally attached to the
positive potential (AUX_OUT+) sources the current. Connecting in this mode is dis-
cussed later in the Connecting an auxiliary output signal to a TTL-compatible input sub-
section of this section.
1
, they need to be connected to an external power source or