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Table 3-7. Query Commands
ASCII Byte
Decimal
0
48
1
49
2
50
3
51
4
52
5
53
6
54
7
55
8
56
9
57
:
58
;
59
<
60
=
61
>
62
?
63
Table 3-7 Notes:
1.
These commands return four ASCII characters in the form NNNN. Leading zeros are blanked.
2.
For CHPA Protocol Option, (DIP Switch S1-Switch #2 of Interface CCA is ON) Attenuator Setting is of the form NN.N0 dB.
D
.01023245 R
.R
OC
EV
Commands
ID/Version Query. An eight-character string will be returned that identifies the
CHPA model and computer interface version.
Summary Status Query. Two bytes of status are returned
Secondary Status Query. Two bytes of status are returned.
Fault/Miscellaneous Status Query. Four bytes of fault conditions and general
information are returned. The information returned mimics the front panel
report. This query will store faults until a Cancel or Reset from any source
clears all bits.
Info/Error Data Query. Two bytes are returned that indicate activity since the
last Info/Error Data Query. The response is port sensitive and reflects the
status of the port (Remote or CIF) queried.
Not used
RF Output Power in dBm Query. Four ASCII characters in the form NN.N are
returned. Leading zero is replaced with a blank.
RF Output Power in Watts Query. Four ASCII characters in the form NNNN
are returned. Leading zeros are blanked.
Attenuator Setting Query. Four ASCII characters in the form NN.N are
returned. Leading zero is blanked.
Not used
Low RF Alarm Trip-point Query (Watts).
High RF Alarm Trip-point Query (Watts).
Low RF Fault Trip-point Query (Watts).
High RF Fault Trip-point Query (Watts).
Meter Query. This command returns meter readings (without the units)
according to the following formats. Leading zeros are replaced with blanks.
Each reading is delimited by a space (ASCII 20 hex 32 dec).
RF Output (dBW)
RF Output (Watts)
Attenuator Setting
Helix Voltage
Helix Current
Reflected RF
Beam Current
Elapsed Time Query. This command will return the elapsed time meters
separated by a space (ASCII 20 hex 32 dec) Heater Elapsed Time Meter
NNNNNN Beam On Elapsed Time Meter NNNNNN
THIS DOCUMENT IS THE PROPERTY OF COMMUNICATIONS & POWER INDUSTRIES.
REPRODUCTION OR RELEASE WITHOUT EXPRESS PERMISSION IS STRICTLY PROHIBITED
(See Note 2)
(see note 1)
(see note 1)
(see note 1)
(see note 1)
NN.N dBW
NNNN W
NN.N dB
(see note 2)
NN.NN kV
NN.N mA
NNN W
NNNN mA
CHPA S
ERIES
3-13
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