Applanix APX-18 Manuale di integrazione hardware - Pagina 11

Sfoglia online o scarica il pdf Manuale di integrazione hardware per Ricevitore Applanix APX-18. Applanix APX-18 15.

The 'power switch' input (Pin 3) on the connector needs to be low (ground) for the board

to power up, and high (3.3V) for the board to turn off. This pin has an internal 1M ohm

pull down resistor so the pin can be left floating, or it can be permanently connected to

ground and the board controlled through the main power input if this extra functionality

is not required.

Pulling the RESET pin 12 to ground will reset the system. For normal operation, this pin

should be left floating as it has an internal pull-up.

5.1.7. DMI

The board supports inputs from a quadrature pulse Distance Measurement Instrument

(DMI). Two signals shall be provided on pins 37 and 38. Each signal shall be a LVTTL

3.3V DC square wave pulse with 50% duty cycle. Signal 1 and signal 2 shall be offset by

90 degrees, which will indicate to the system the direction of travel. The board does not

provide power to the wheel encoder.

Only TTL 3.3 V input is supported. It is not buffered or protected for any input outside of

the 0-3.3V range. See Figure 4 for an example of TTL level conversion. Connecting a 5V

TTL pulse will result in board damage!

The GNSS connectors are located next to the RF cover shield as indicated on the Figure

5. The connector type is MMCX and provides direct power to an active antenna (3.3 to

5V).

The IMU body frame is defined as right hand orthogonal coordinate system with its

origin as shown in the drawing. Please refer to Figure 6 for frame definition.

OR BY ANY MEANS WITHOUT THE PRIOR WRITTEN CONSENT OF APPLANIX CORPORATION.