Masterclock GPS 500, Руководство пользователя

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GPS500 User Manual – Rev E – 2020.04.14 2484 W Clay St, St Charles, MO 63301
4
SW1 controls
Serial Output Truetime and NMEA.
---------------------------------------------
1 Truetime Lock Indicator enable.
2 Truetime Interval Blanking enable. *see
section regarding inverval blanking, page 14
3 Disable output if GPS is not locked.
Applies to Truetime and NMEA only.
4 Truetime enable.
5 NMEA enable.
Select NMEA output messages:
678
000 = ZDA
001 = ZDA, GGA, GSA, RMC
010 = ZDA, GGA, VTG, GLL, GSA, RMC
011 = reserved
100 = ZDA, GGA, VTG
101 = reserved
110 = ZDA, GGA, VTG, GSV
111 = reserved
see also SW3-6,7,8 for serial baud rade
SW2 controls
Daylight Savings and Time Zone.
------------------------------------------------
Select the DST standard:
12
00 = no offset
01 = US/Canada Standard
10 = European Standard
11 = Mexico Standard
3 Makes the time zone offset negative
4 Adds 1/2 hour to the time zone offset
Set the time zone offset in hours:
5678
0000 = no offset
0001 = 1 hour
0010 = 2 hours
0011 = 3 hours
0100 = 4 hours
0101 = 5 hours
0110 = 6 hours
0111 = 7 hours
1000 = 8 hours
1001 = 9 hours
1010 = 10 hours
1011 = 11 hours
1100 = 12 hours
SW3 controls
Time Code and PPS control,
Time Quality control,
Baud of Truetime/NMEA output.
---------------------------------------------
1
0 = Output time code whether GPS
is locked or unlocked.
1 = Do not output time code when
GPS is unlocked.
2
Time Quality of IRIG-B 1344 .
0 = Do not indicate Time Quality.
1 = Indicate Time Quality.
3, 4 = Reserved
5
PPS Output-see also SW4-6,7,8
0 = No PPS output if GPS unlocked
1 = PPS output will be from processor
if GPS unlocked.
Baud Rate of Truetime/NMEA output
:
678
000 = 9600
001 = 19200
010 = 38400
011 = 57600
100 = 4800
101 = reserved
110 = reserved
111 = reserved
SW4 controls
Type, format and "Coded Expressions" of time code.
------------------------------------------------------
1
0 = SMPTE
1 = IRIG
US/Canada standard
2
nd
Sunday in March/
1 st Sunday in November
2:00 AM local time
European standard
Last Sunday in March/
Last Sunday in October
1:00 AM UTC time
Mexico standard
1 st Sunday in April
Last Sunday in October
2:00 AM local time
CONFIGURATION SWITCH SETTINGS
PPS output pulse width:
678
000 = ~ 200 milliseconds
100 = ~ 1 millisecond
010 = ~ 10 milliseconds
001 = ~ 100 milliseconds
23 when IRIG
00 = IRIG B0 DCLS (PWM)
01 = IRIG B1 AM
10 = reserved
11 = Time Code output disabled
4,5 when IRIG
00 = BCDtoy (IRIG Bx02)
01 = BCDtoy, SBS (IRIG Bx03)
10 = BCDtoy, BCDyear, SBS (IRIG
Bx04)*
11 = reserved
*Only time quality bits 20-23 set.
See SW3-switch 2.
Note: Seven (7) IRIG expressions
can be output by other Masterclock
generators, but GPS500 will output
only these 3:
toy = time of year.
BCD = Binary Coded Decimal.
SBS = Straight Binary Seconds.
23 when SMPTE
00 = SMPTE 30 frames per second
01 = SMPTE 25 frames per second
10 = SMPTE 24 frames per second
11 = Time Code output disabled
45 when SMPTE
00 = SMPTE - Leitch date encoding
01 = SMPTE - 309M Date Encoding
MM/DD/YY,
Time Zone included
10 = SMPTE - 309M Date Encoding
Modified Julian Date
(MJD),
Time Zone included
11 = reserved