System Description

System Description and Installation Manual for MXS ICD10004-01

System State Byte

Byte Offset

Byte Name Field Description

SSB0

SSB0 System State Byte indicates current Transponder State Information

Bit 0 Transponder Fail Flag

1 = an error within the Transponder. The Status message can be queried to

determine the cause of the Transponder error.

Bit 1 System Fail Flag

1 = an error detected by the transponder in which a required input from the

system is not available. The Status message can be queried to determine the

cause of the system failure.

Bit 2 Reserved

Bit 3 Weight on Wheels

1 = Transponder has detected that the WoW discrete input is valid in the

Installation message and the discrete is true indicating that the aircraft weight

is on the wheels.

Bit 4 Maintenance Mode

1= ON

Bit 5 Altitude Source

0 = Integral

1 = From host

Bits 6 - 7 Transponder Operational Mode

00 = STBY

01 = ON

11 = ALT