Comtech EF Data HPCST-5000 - Manual (Page 165)

High-Power TWTA Satellite Terminals Programming Guide for Redundant Controller
Rev. 1 A–17
A.4.2 TWTA Control Commands
The TWTA control commands are listed in Table A-8.
Table A-8. TWTA Control Commands
ASCII Description
@ High Voltage On. Activates beam-on request and causes high voltage to be applied to the TWT when
appropriate (i.e., after filament time delay).
A High Voltage Off. Deactivates beam-on request and turns off the high voltage if it is on. This normally
places the TWTA in the standby state.
B Fault Reset. Reset any of the TWTA’s resetable faults.
C Set Attenuator. Steps attenuator up or down X number of steps. Parameter is a “!” terminated string
containing the number of steps proceeded by a + or - sign.
D Set Power in dBW. Sets the TWTA to the requested power level when four ASCII characters in the form
XX.X (where X indicates the digit 0 through 9) are applied as an argument in the command message.
E Set Power in Watts. Sets the TWTA to the requested power level when a number of the form XXXX is sent
as an argument in the command message.
F Set Constant Power out (dBW). Sets constant output power level to xx.x dBW. Parameter is a 3-character
string.
G Set Constant Power out (Watts). Sets constant output power level to xxxx Watts. Parameter is a
4-character string.
H Terminate Constant Output Power. Ends TWTA auto gain stabilization.
I Force RF Inhibit. Turns off RF Chain.
J Clear RF Inhibit. Turns on RF Chain.
K Fault Reset.
L Set Low RF Trip Point (Watts). Sets low RF Trip Point in Watts. Parameters = 6 bytes.
Byte 1 Character “A” (hex 41) for Alarm Setting
Character “F” (hex 46) for Fault Setting
Byte 2 to 6 Trip Point Value xxxx Watts
M Set High RF Trip Point (Watts). Sets high RF Trip Point in Watts. Parameters = 6 bytes.
Byte 1 Character “A” (hex 41) for Alarm Setting
Character “F” (hex 46) for Fault Setting
Byte 2 to 6 Trip Point Value xxxx Watts
N to Q Reserved.
R Enable RF Limits. Turns on RF limit checking.
S Disable RF Limits. Turns off RF limit checking.
T to U Reserved.