X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
3
3
-
-
1
1
7
7
R
R
E
E
V
V
E
E
3-116.1 SERIAL PORT EMULATION COMMANDS
As a convenience to our customers, the TrueTime XL-DC emulates most of the Serial Port commands
of the older GPS-DC Mark II GPS Synchronized Clock. Most customer programs written to interface
with the Mark II Serial Port will also interface with the XL-DC Serial Port if the emulation mode is
enabled with Keypad Function 16. Refer to the following table for the available emulation mode
commands.
EMULATION MODE COMMANDS:
COMMAND MODE DESCRIPTION
C
Mode C
Continuous time, once per second
F
Mode F
Format Time Message
R
Mode R
Reset to default time format and Mode C
T
Mode T
Time on request
When the emulation mode is enabled with Keypad Function 16, the Serial output defaults to Mode C. If
the unit was in the emulation mode at power-down, it will power-up in the emulation mode and default
to Mode C.
3-116.2 MODE C - CONTINUOUS TIME, ONCE PER SECOND
Use Mode C to set the Serial Port to output the time message once each second. Mode C is the power-
up default. To request Mode C, send the ASCII character C to the Serial Port. The format of the output
string may be changed with Mode F. The default output string format is:
<SOH>DDD:HH:MM:SSQ<CR><LF>
where:
<SOH>
=
ASCII start-of-header character (Hex 01)
DDD
=
3-digit day of year
:
= ASCII
colon
character
HH
= two-digit
hours
MM
= two-digit
minutes
SS
= two-digit
seconds
.
=
ASCII period character
mmm
=
three characters for milliseconds
Q
=
time quality character (see following)
<CR>
=
ASCII carriage return character
<LF>
=
ASCII line feed character
The time quality character may be one of the following:
SPACE
which indicates a worst-case error less than threshold 1
.
which indicates a worst-case error greater than or equal to threshold 1
*
which indicates a worst-case error greater than or equal to threshold 2
#
which indicates a worst-case error greater than or equal to threshold 3
?
which indicates a worst-case error greater than or equal to threshold 4
Summary of Contents for 151-600
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