Xicom XTU-400K, Operation And Installation Manual

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MNC-0500-002 29 of 36 Revision H
Amplifier Communication and Protocol, Octagon ISA CPU
Clear RF Inhibit
Command Byte : 'J'
Function : RF drive to the TWT is enabled.
Compatibility : Attenuator required.
Set Attenuator
Command Byte : 'K'
Parameter: “XX.X” dB of attenuation OR
“IX.X” to increase attenuation by X.X OR
“DX.X” to decrease attenuation by X.X
Function : Instantly sets the attenuator to the specified dB level. Use caution, as sudden
large changes to output power can damage the tube.
Response: Resulting attenuation in XX.X dB. If the user specified an attenuation value
outside the attenuator’s range, the closest valid value will be used.
Note: Use this to find max attenuation. For example, send {AK 99.9}. A typical
response would be {AK 30.0}, indicating a 30 dB attenuation range.
Compatibility : Attenuator required.
Min RF Power Trip
Command Byte : 'L'
Function : Sets a Min RF trip point. If output power drops below the set point, an alarm
or fault is generated provided the HPA has processed an “Enable RF Limits” command
('R').
Parameter :
"AXXXX" to set an Alarm trip point,
"FXXXX" to set a Fault trip point, “D” to disable.
XXXX is the desired trip point in Watts.