T e m p u s L X G P S U s e r M a n u a l
79
"Smarter Timing Solutions"
Appendix
F
Serial Time Output
This option is provided on a second RS-232 serial port. It is a serial time string output that provides
a once-per-second sequence of ASCII characters indicating the current time. The “on-time” charac-
ter is transmitted at the very beginning of each second, with the leading edge of the start bit transmit-
ted during the first 100 microseconds. This output starts automatically at power-up.
To configure this output refer to
Chapter 5 - Front-Panel Keypad and Display
and
Chapter 6 - Control
and Status Commands
for details on the
cpusertime
and
cpusertimeconfig
.
There are several different formats for this string. The format, baud rate and parity can all be changed
via the front-panel keypad or via the console command
cpusertimeconfig
. Baud rate selections
are 57600, 19200, 9600, and 4800. Parity selections are odd, even, and none. Format selections are
Sysplex, Truetime, EndRun, EndRunX, NENA and NMEA-0183.
Sysplex Format
“Sysplex” means SYStem comPLEX and is a term used to describe computing on clusters of comput-
ers. The Sysplex option is designed to provide time synchronization for an IBM Sysplex Timer. It
can also be used for precise time synchronization by any computers that do not use NTP and have
an available serial port connection. The time contained in the string is UTC and it is sent once each
second:
<SOH>DDD:HH:MM:SSQ<CR><LF>
<SOH>
is the ASCII Start-of-Header character (0x01)
DDD
is the day-of-year
:
is the colon character (0x3A)
HH
is the hour of the day
MM
is the minute of the hour
SS
is the second of the minute
Q
is the time quality indicator and may be either:
<space>
ASCII space character (0x20) which indicates locked
?
ASCII question mark (0x3F) which indicates
the unsynchronized condition
<CR>
is the ASCII carriage return character (0x0D) and is the “on-time” character.
<LF>
is the ASCII line feed character (0x0A)
Summary of Contents for Tempus LX GPS
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