Sandel ST3400H HeliTAWS, Руководство по установке

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3.10 NVIS Control
The NVIS CTRL discrete is an OPEN/GND input which controls the NVIS mode and is
intended to be connected to a sustained toggle or sustained pushbutton switch. In the default
configuration GND=NVIS ON and OPEN=NVIS OFF. In this configuration a wire break to
the switch would result in NVIS OFF.
The input configuration can be changed by the installer in the SYSTEM maintenance page to
reverse the logic so that GND=NVIS OFF and OPEN=NVIS ON. In this configuration a wire
break to the switch would result in NVIS ON.
3.11 Audio Output
The audio output produces all advisories and alerts which utilize audio.
Two types of outputs are provided, a speaker output and headphone output. The outputs are
located on J3 and connection to at least one of these outputs is required.
The headphone output, if used, must connect to the un-switched input of the helicopter audio
system. This output is selectable to a nominal level of 25mw or 150mw output by strapping
jumpers on J3. If no jumper is installed the headphone output is disabled.
The speaker output, if used, must be directly connected to a dedicated 4 or 8 ohm cockpit
speaker.
A volume level trim adjustment which affects both outputs simultaneously is present on the
AUDIO maintenance page.
3.12 Uploading Equipment
A USB interface is available on the front of the ST3400H to upload system software, terrain
data, obstacle data, airport data, and configuration data into memory and to download
configuration data from memory.
Data is loaded from a PC or laptop computer with Microsoft Windows XP (or later) operating
system software to the ST3400H. Drivers, the loader program, and loading instructions are
supplied with the applicable software or data.
3.13 Display Dimming
The ST3400H screen dimmer is controlled from the front panel knob using the PULL position.
External annunciator dimming may be accomplished using the existing aircraft day/night buss
by connecting the high-side of the annunciator lamps day/night buss.
82046-IM-K ST3400H INSTALLATION MANUAL Page 3-4