Geometrics Inc. G-882 Cesium Marine Magnetometer Page
Julian Output format:
There are five clock output fields that can be turned on or off. These are the
Julian Day, Hour, Minutes, Seconds, and Fractional seconds (to .01 seconds).
These are selected with the "OJxxxxxyy" command. Each of the five x's
corresponds to an output field, and can either be a '0' or a '1'. '1' turns the field
on, '0' turns the field off. The yy characters is the counter number. Following is a
diagram showing which character corresponds which each display field:
command: "OJ0111103"
\ \ \ \ \ \ \__Counter number LSB
\ \ \ \ \ \__Counter number MSB
\ \ \ \ \__10 ms field
\ \ \ \__Seconds field
\ \ \__Minutes field
\ \__Hours field
\__Days field
In this example counter three would have all clock fields output except the Julian
Day.
The counter number characters are optional. If not present the command would
affect only counter 0 in the chain.
Find Counters:
This command is used to figure out how many counters there are in the daisy
chain. An 'F00' is sent to the first counter which assigns it as counter 0. Before
the command is echoed to the next counter the command is modified to 'F01'.
The next counter modifies it to 'F02', and so on until the logging PC gets the
command echo of 'Fxx' where xx is the number of counters in the chain.
Continuous data output can be inhibited by sending the command 'F01' to the first
counter. In this mode there is no first counter (#00) which normally starts data
transmission. Data output can be resumed by sending a new 'F00' command.
Set Preamble character:
By default the first character of each data stream is a '$'. If another character is
desired the 'Px' command is used to change it to the character sent following the
'P'. All characters are allowed except control characters, digits (0-9), spaces,
commas, decimal points, and the termination char ('*').
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