Comtech EF Data XTRT-400C Operation And Installation Manual page 136

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 TWT.
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.
Command Byte: 'L'
Function: Sets a Low 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.
Command Byte: 'M'
Function: Sets a High RF trip point. If output power exceeds 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.
MNC-0500-038
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Amplifier Communication and Protocol, XTRT, Touchscreen TWTA
Set Attenuator
Low RF Trip
High RF Trip
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