TrueTime 151-602 - 1-15 INTERFACE SPECIFICATIONS

X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
1
1
-
-
5
5
R
R
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E
V
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E
E
The XL-DC timing and frequency specifications are:
1 PPS Output GPS Time ±150 ns
Accuracy: UTC-USNO <40 ns rms (150 ns peak)
Frequency Output
Accuracy: < 3 x 10
-12
Frequency/Timing Allan Deviation,
Stability: 1 x 10
-9
@ 1 sec
3 x 10
-10
@ 10 sec
3 x 10
-10
@ 100 sec
3 x 10
-12
@ 1 day
Oscillator 2x10
-6
, over 0°C to 50°C when not
Stability: tracking satellites.
IRIG B Amplitude Modulated Output (STANDARD):
Accuracy: 10 µs to UTC
IRIG B DC Level Shift Output (OPTION):
Accuracy: 150 ns to UTC, 100 ns without SA
Time Interval/Event Timing Input (OPTION):
Resolution: 30 ns, single shot.
Accuracy: 150 ns + 30ns/2
Frequency Measurement Input (OPTION):
Resolution: 6 x 10
-11
@ 1 second interval
Accuracy: 3 x 10
-12
Stability: Same as Frequency & Timing Stability
1-15 INTERFACE SPECIFICATIONS
The standard serial data port is a bidirectional EIA standard RS-232C interface. RS-422 is available as
an option. The specifications are:
Data: Time, day of year through milliseconds, in ASCII characters, output once per
second or on request. Also special functions as listed in Section III.
Data Rates: User-selectable on Models XL-DC-601/602 from 300, 600, 1200, 2400, 4800,
9600 and 19200 bps. Fixed on Model XL-DC-600 (user-specified).
Data Bits: User-selectable on Models XL-DC-601/602 from 7 or 8. Fixed on Model
XL-DC-600 (user-specified).
Parity: User-selectable on Models XL-DC-601/602 from even, odd or none.
Fixed on Model XL-DC-600 (user-specified).
Stop Bits: User-selectable on Models XL-DC-601/602 from 1 or 2. Fixed on Model
XL-DC-600 (user-specified).