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CDM-500 Closed Network Satellite Modem
Parameter
Command
Arguments
Type
(Instruction
for Command
Code and
or Response to
qualifier)
Query
Faults and
N/A
5 bytes, first 3
Status
bytes
numerical4th
and 5th bytes,
value of 0 or 1
Rev. 1.3
Description of arguments
(note that all arguments are ASCII numeric codes,
that is, ASCII codes between 48 and 57)
Query only.
Unit returns the current fault and status codes for the
Unit (hardware), Tx Traffic and Rx Traffic, in the
form abcde, where:
a = Unit fault status, b = Tx Traffic status,
c = Rx Traffic Status, d = Change in Fault Status
since last poll (0 = none, 1 = change), e = Change in
Unit Configuration since last poll (0 = none, 1 =
change)
Unit faults:
0 = No faults
1 = Power supply fault, 5 volts
2 = Power supply fault , 12 volts
3 = Power supply fault, -5 volts
4 = Power supply fault, 18 volts
5 = Power supply fault, -12 volts
6 = FPGA load fail
7 = Tx synthesiser lock
8 = Rx synthesiser
9 = Power cal Checksum error
Tx Traffic status:
0 = Tx traffic OK
1 = No clock from terrestrial interface
2 = Tx FIFO slip
3 = AIS detected on incoming data
Rx Traffic status:
0 = Rx Traffic OK
1 = Demodulator unlocked
2 = AGC Alarm - signal level too high
3 = Frame sync lost (EDMAC mode only)
4 = Buffer Underflow
5 = Buffer Overflow
6 = AIS detected on incoming data
7 = Eb/No threshold exceeded
Response to
Query
Command (target to
(Instruction
controller)
Code and
qualifier)
N/A
FLT?
Remote Control
Response to
query (target
to controller)
FLT=abcde
(see description
for details of
arguments
B–17
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