64 Serial Communication and Command Set
When a command requests information from a clock, it returns the most current data available.
Numeric data is returned as an ASCII string of numeric characters, with leading sign and embedded
decimal point as needed. Strings are normally terminated with carriage return and line feed char-
acters, however sometimes this is not the case. Enter any RS-232C command as written in these
tables without pressing ENTER. Characters are automatically entered when typed. If including
any of these commands in a programming sequence, do not include any carriage-return or line-feed
characters.
In this section, the syntax of each command follows the word ”Command:” and is in bold font.
Please read the comments below each command as some commands include one or more commas
and in other cases a comma will separate multiple commands.
The following symbols and syntax are used:
C
= Shorthand for carriage-return, line-feed
’U’ = UTC Time
’L’ = Local Time
soh = An ASCII character (start of header) = Hex 01
bel = An ASCII character = Hex 07
n = integer used for various numerical values (e.g. nnn in minutes)
yyyy = four digit year
ddd = Julian day-of-year
mm = month
hh = hour
mm = minute
ss = second
Underlines are used for clarity only and graphically represent the location of ASCII spaces.
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