Comtech EF Data XTRT-400C-BUC Operation And Installation Manual page 125

Command Byte: '3'
Parameter: None
Response: "AB" formatted as follows:
Byte 'A'
Bit 7: Reserved.
Bit 6: Complement of bit 5.
Bit 5: Latched Helix Arc Fault.
Bit 4: Momentary Helix Arc Fault.
Bit 3: TWT Over Temp Fault.
Bit 2: Cathode Over Voltage Fault.
Bit 1: Reserved
Bit 0: Low Line.
Parameter: '# extended fault status'
Response: "ABCD"
Byte 'C'
Bit 7: Reserved.
Bit 6: Compliment of Bit 5.
Bit 5: Reserved.
Bit 4: Cover Interlock.
Bit 3: Fast VSWR
Bit 2: Reserved.
Bit 1: Reserved.
Bit 0: Phase Lock (future).
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 detec-
tion 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 exceeds the 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.
MNC-0500-038
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Amplifier Communication and Protocol, XTRT, Touchscreen TWTA
Fault Status
Byte 'B'
Bit 7: Reserved.
Bit 6: Complement of bit 5.
Bit 5: Cathode Under Voltage Fault.
Bit 4: High Reflected Power.
Bit 3: External Interlock open or cable interlock.
Bit 2: Low Output Power.
Bit 1: High Output Power.
Bit 0: Waveguide Arc Fault (If configured with a
waveguide arc detector).
Byte 'D'
Bit 7: Reserved.
Bit 6: Compliment of Bit 5.
Bit 5:
Bit 4: Upconverter Fault (If configured with
Upconverter).
Bit 3: RF Power Limit Fault. (software overdrive)
Bit 2: Reserved.
Bit 1: Overdrive Fault.
Bit 0: Thermal Interlock.
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