General Description
Features Overview
20 Transceiver Family 620X DV14307.03 Issue 04 March 2016
Tandem Operation
Tandem mode enables operation of two controllers simultaneously. The controllers synchronizing
each other in such a way, that both display the same information.
Illumination
The illumination of LCD and push buttons can be controlled either directly from the front panel via the
user menu or externally via the dimming input lines. If external dimming selected, the illumination
curve (brightness to voltage relation) is adjustable in configuration setup.
LOW BATT Indication
The transceiver monitors power supply voltage. If the supply voltage drops below the adjustable
threshold, the display indicates the message "LOW BATT". If the power supply voltage drops further,
emergency operation mode activates.
Emergency Operation
If the power supply voltage drops below 10.25 V, the transceiver continues operation with degraded
performance. If power supply further drops below 9.0 Volt, the unit automatically switches off.
Built-in Tests PBIT and CBIT
After power-up, the unit performs a self-test (power-up built-in test / PBIT). During PBIT, the
transceiver displays "WAIT" and additionally the corresponding software versions of both, the control
head (CH) and core module (CM) become visible.
If faults are detected during PBIT, the error message "FAILURE, press any key" is displayed. If no
faults are detected the transceiver automatically activates the last active mode set at last power-off.
During normal operation, a continuous built-in test (CBIT) permanently verifies the correct operation of
the unit. If detecting a problem during CBIT an error message become displayed.
Configuration Setup
Configuration of parameters such as mike sensitivity, mike type selection, speaker enable/disable and
several other parameters, via the configuration setup provided.
Service Mode
The service mode is a special configuration mode accessible via RS422 interface with a proprietary
serial data communication protocol. This mode is for use by authorized maintenance organizations
during aircraft service on ground only.
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