74 Serial Communication and Command Set
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 (stab. = 1) 5 32 Time Error
2 4 Power Supply Error 6 64 VCXO Error
3 8 IRIG-B Bus Fault 7 128 Receiver Failure
Table 9.3: System Status Information Chart
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.
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
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