Arbiter Systems 1088A, Руководство по эксплуатации

Страница: 99 / 279

9.2 Command Set 79
System Status
Command: SS
SS returns the instrument operation status and Option 18 status (if installed) whenever the status
changes. See Table 9.1 for bit assignments of clock conditions.
Response: I=nn:nn X=nn:nn
C
(updates whenever status changes)
Format: I = internal clock conditions
X = external clock conditions
nn:nn = hexadecimal representations of the status byte.
The two digits preceding the colon describe present condition of the instrument.
The two digits after the colon indicate the parameters that have changed. See Table 9.3.
Bit Weight Function Bit Weight Function
0 (LSB) 1 OCXO Not Inst. (Set to 1) 4 16 Out of Lock
1 2 Stabilized (fault = 0) 5 32 Time Error
2 4 Power Supply Error* 6 64 VCXO Tune Error*
3 8 IRIG-B Fault (External)* 7 128 Receiver Failure
Table 9.3: System Status Information Chart
*requires Option 18
Time Quality
Command: TQ
TQ returns a single ASCII character (0, 4–9, A, B, F) indicating estimated worst-case time quality,
which follows the IEEE Standard, 1344. Table 9.4 gives the returned value and error category.
Response: h
C
Where ‘h’ is described in Table 9.4 below.
Value Error Value Error
0 Locked, max. Accuracy 8 Unlocked, accuracy < 10 ms
4 Unlocked, < 1 us 9 Unlocked, < 100 ms
5 Unlocked, < 10 us A Unlocked, < 1 s
6 Unlocked, < 100 us B Unlocked, < 10 s
7 Unlocked, < 1 ms F Clock failure
Table 9.4: Unlocked Time Quality