MNC-0500-026 30 of 32 Revision G
Amplifier Communication and Protocol, Rabbit CPU
Step Attenuator
Command Byte: ‘C’
Function: Steps attenuator count up or down. The attenuator count is written
to the D-to-A converter that controls the attenuation. When this command is
executed, the change in attenuation is virtually instantenous, permitting
radical adjustments to output power. Note that when high voltage is on,
drastic attenuator changes may affect the life of the TWT. A recommended
alternative is to use a Go To Power command (‘D’ or ‘E’).
Parameter: “+XXXX” steps. This is an intege preceded by ‘+’ or ‘-’. This
offset is applied to the current attenuator count which ranges from 0 to 4095.
Note: If direct attenuation control is required, most users will prefer command
Set Attenuator. (‘K’), which specifies attenuation in dB.
Compatibility:Attenuator required.
Terminate Constant Power
Command Byte: ‘H’
Function: If active, Constant Power Mode is terminated.
Compatibility: Attenuator required.
Time and Date
Command Byte: ‘%’
Function: Sets the Amplifier internal clock. The clock is referenced when
time stamping faults as they are written to the Fault Log.
Parameter: “YYY/MM/DD, hh:mmm”
Example: 2002/02/08, 13:01
YYYY = 2002
MM = 02
DD = 08
hh = 13
mm = 01
Note: The hours are in 24-hour format.
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