44
4.2.4 SYSTEM FAULT STATUS = ALR
There is no SET command.
The QUERY command requires no parameters.
Remote Command Sequence: ?ALR
Response: ?ALRabcdefghi
?ALR: Status indicator
a-i: "0" or "1" ASCII numeric character
0 = No fault or fault
1
=
Fault/Fault
a-i indicates the status of the component faults described below.
a
Power Supply ‘A’ Fault
b
Power Supply ‘B’ Fault
c
Converter Bus Fault
d
Converter Contact Fault
e
Switch fault
f
Switch Bus fault
g
Reserved for future use
h
Reserved for future use
i
Reserved for future use
4.2.5 UNIT ATTENUATION = ATT
The SET command requires two parameters. One is two digits in length representing
the redundancy chain position, and the other which is three digits in length represents
the attenuation in tenths of a dB. No decimal points are used. The attenuation values
increment in 0.2 dB steps. For values less than 10.0 dB leading zeros must be used.
This command is used to specify the attenuation of the Primary converter in a given
chain position. If the Primary converter’s serial link is enabled and the unit attenuation is
sent to the NSU control unit, the attenuation of the Primary converter in that chain
position will be updated. It will be updated even if the attenuation value is the same as
what is presently stored in the Primary converter.
If the serial link between the NSU Control unit and a Primary converter is disabled, a
Backup converter with a serial link will still be able to replace that failing Primary
converter at the correct output levels by using the attenuation and Gain Equalization
data stored in the NSU Control unit.
Remote Command Sequence: $ATTnnTttt
Unit Response: $ATT
The QUERY command requires one parameter, two digits in length representing the
redundancy chain position. The reply will consist of two parameters one two digits in
length indicating the redundancy chain position and one that is three digits in length
indicating attenuation in tenths of a dB. No decimal points are used. Leading zeros will
be used in the response.