SkyTrac Systems Ltd.
Document Rev. 01.020 DOC0334 Page 26 of 49
Restricted Proprietary and Confidential Information
Table 15ā ARINC 404 Bay B: pin descriptions
Microphone In positive line
Microphone In negative line
RS485 port 2 inverted line
Ethernet negative receive port
RS485 port 2 ground reference
RS485 port 2 non-inverted line
Ethernet positive receive port
Ethernet negative transmit port
Analogue Input 2 (Reserved. Do not use.)
Analogue Input 3 (Reserved. Do not use.)
Ethernet positive transmit port
RS485 port 2 non-inverted line (4 wire mode)*
RS485 port 2 inverted line (4 wire mode)*
* RS485 4 Wire Mode is only available on ISAT-200R P/N: 101-200-03
** RS-485_GND2 is isolated within the ISAT-200 system. RS-485_GND2 needs to be connected to
aircraft ground for reliable operation of the RS-485 databus.
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