Advanced I/O Engine; Auxiliary I/O Interface - Matrox Indio Installation And Hardware Reference

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Advanced I/O engine

Matrox Indio has an advanced I/O engine that controls the auxiliary I/O interface.

The engine includes 16 timers, two rotary decoders, two I/O command lists (and

their associated output registers), and an 8-bit user-output register.

The auxiliary I/O interface is composed of 8 input and 8 output, optically isolated,

digital auxiliary signals. The auxiliary input signals can trigger functionality in the

advanced I/O engine (for example, timers), cause software events, or can be

transmitted to third-party devices over an auxiliary output signal. Onto an

auxiliary output signal, you can route a signal generated in the advanced I/O

engine (for example, a timer output) or the state of a bit of one of the engine's

registers (for example, the user-output register which is set using software). All

auxiliary signals support voltages up to 24 V in sinking or sourcing configurations.

By default, an auxiliary input signal at 11 V or above is considered high, while

anything at 5 V or below is considered low. However, by installing jumpers on the

board, you can individually set auxiliary input signals to TTL mode. When an

auxiliary input signal is in this mode, a signal at 2 V or above is considered high,

while anything at 0.8 V or below is considered low; typically, the signal should

have a maximum of 5 V and a minimum of 0 V.

Typically, for an auxiliary output signal to source voltage, you must attach an

external power source to Matrox Indio. However, by installing jumpers on the

board, you can individually set auxiliary output signals to TTL mode; in which

case, they can source up to 5 V

without an external power source. For an auxiliary

output signal configured in TTL mode, the signal will either output 5 V or 0 V.

When you route an external signal to an auxiliary signal or vice versa, verify that

the external signal meets the electrical specifications of the auxiliary signal. All

auxiliary output signals are individually fuse-protected up to 100 mA.

Note that auxiliary output signals in TTL mode share the same 5V supply (Matrox

Indio generates an isolated 5 V supply) and TTL_COM return path; this means

that auxiliary output signals in this mode are not isolated from each other

(regardless of the bank).

1. Through an on-board 300 Ohm pullup circuit.

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