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34 Chapter 4: Hardware reference

❖ The polarity of the active and inactive levels of the trigger signal is software

programmable.

Matrox Meteor-II /Multi-Channel can also operate in asynchronous reset mode.

In this mode, the digitizer resets the camera to begin a new frame when the trigger

signal is received.

Direct TTL trigger Trigger signals can be received in TTL format directly through the video-input

connector. The TTL level signal must have a maximum amplitude of 5 V. A signal

over 2 V is considered high while anything less than 0.8 V is considered low. The

transition of 0.8 V to 2 V is considered to be the rising edge.

The trigger signal’s pulse width must be greater than one pixel. You can determine

the pulse width by taking the inverse of the pixel frequency. For example, if the

pixel frequency is 12.27 MHz, the minimum pulse width is 1/12.27 MHz ≈ 82

nanoseconds.

Opto-isolated trigger Trigger signals connected to the OPTOTRIG- and OPTOTRIG+ input pins, pass

through an opto-coupler, a device that protects the board from outside surges;

OPTOTRIG- is usually connected to the ground of the trigger source. The voltage

difference across OPTOTRIG+ and OPTOTRIG- must be between 4.05 V and

9.16 V for logic high, and between -5.0 V and 0.8 V for logic low. Refer to

Appendix B for the pinouts of these signals on your board.

UART

Matrox Meteor-II /Multi-Channel features a Universal Asynchronous

Receiver/Transmitter (UART) that provides an RS-232 serial interface. For

example, this allows you to remotely control a camera or a motion control unit,

or communicate with a program logic controller (PLC). The UART is

programmed using the MIL-Lite command MdigControl() with the

M_UART...

control types.

Note that the UART is not present on the Meteor-II /Multi-Channel for

PC/104-Plus.

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Matrox Multi Spécifications Page 34