MNC-0500-026 18 of 32 Revision G
Amplifier Communication and Protocol, Rabbit CPU
Fault Status
Command Byte: ‘3’
Parameter: None
Response: “AB” formatted as follows:
Byte ‘A’ Byte ‘B’
Bit 7: Reserved. Bit 7: Reserved.
Bit 6: Complement of bit 5. Bit 6:
Bit 5: Latched Helix Arc Fault. Bit 5: Cathode Under Voltage Fault
Bit 4: Momentary Helix Arc Fault. Bit 4: High Reflected Power.
Bit 3: TWT Over Temp Fault. Bit 3: External Interlock open.
Bit 2: Cathode Over Voltage Fault. Bit 2: Low Output Power.
Bit 1: Fan Locked. Bit 1: High Output Power.
Bit 0: Low Line Bit 0: Waveguide Arc Fault (if configured
with a waveguide arc detector)
Parameter: ‘#’
Response: “ABCD”
Byte ‘C’ Byte ‘D’
Bit 7: Reserved. Bit 7: Reserved
Bit 6: Compliment of Bit 5. Bit 6: Compliment of Bit 5.
Bit 5: Reserved. Bit 5: Return Loss Fault.
Bit 4: Cover Interlock Bit 4: Upconverter Fault(if configured
with Upconverter)
Bit 3: FAST VSWR Bit 3: RF Power Limit Fault
Bit 2: Reserved. Bit 2: Reserved.
Bit 1: Reserved. Bit 1: Reserved.
Bit 0: Reserved. Bit 0: Reserved
Notes:
1. Byte B, Bit 1, 2, and 4 are user settable alarms for High Output Power,
Low Output Power, and High Reflected Power respectively. A High Reflected
Power fault can also occur when the VSWR detection circuit trips.
2. Byte A, Bit 3, TWT Over Temp fault: This bit is set when the temperature
on the collector of the TWT exceeds the manufacturers safe operation
specification. This is a non-latching fault. Upon detecting a fault, the amplifier
will shut off the High Voltage to the tube. The TWT temperature will cool
down until safe to operate again; the High Voltage will be automatically
turned back up.
3. Byte A, Bit 2 Cathode Over Voltage fault: This bit is set when the Cathode
voltage applied to the TWT is below a safe operation threshold. This is a
latching fault that has to be reset with the reset command.
4. Byte B, Bit 5 Cathode Under Voltage fault. This bit is set when the
Cathode voltage applied to the TWT is below a safe operation threshold.
This is a latching fault that has to be reset with the reset command.
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