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output formats, and many other operational settings of this sensor. Having access to this
information makes the Command Mode useful in assisting the factory to remotely troubleshoot
operational problems that may occur. For more details, see the RS-232 Input Commands section
later in this manual.
Interface
The DMS has analog, digital logic, and digital serial interface capabilities.
RS-232 Output Format
The standard RS-232 output consists of a string of decimal ASCII characters sent asynchronously
at regular intervals. Nominally, the string is sent at 9600 baud with eight data bits, one stop bit and
no parity. The mating connector for the RS-232 is a 9 Pin Male D-Sub. The RS-232 signal is
referenced to signal ground. The number of strings sent per second depends on the baud rate and
the output format. The maximum rate is 71.11 strings per second. See Appendix A for information
on how to change the data string. The contents of a typical string are formed as follows:
1.
A single letter and a space used to indicate the start of the data string. The letter "G"
indicates the start of an inertial data string with successful GPS data input. The letter "T"
indicates the start of an inertial data string with successful Track Heading data input. The
letter "I" indicates the start of an inertial data string with GPS disabled or absence of valid
GPS data. The letter "R" indicates the start of a Reference data string. If the letter is in
lower case ("g", "t", "i", or "r"), an error over-range condition is indicated (see below).
2.
A nine character string representing the Universal Time (UTC) starting with six digits, a
decimal point, one digit and a space for up to 235959.9 Hours minutes seconds tenth
seconds (HHMMSS.S). Note: The field is filled with asterisks when the data is invalid.
("******.*")
3.
A seven character string representing the Bank angle starting with a "+" or a "-", followed
by three digits, a decimal point, one digit and a space for up to ±179.9 degrees.
4.
A six character string representing the Elevation angle starting with a "+" or a "-", followed
by two digits, a decimal point, one digit and a space for up to ±89.9 degrees.
5.
A six character string representing the Heading angle by three digits, a decimal point, one
digit and a space for zero to 359.9 degrees.
6.
A seven character string representing the GPS Ground Track/Forward Velocity starting
with a "+" or a "-", followed by three digits, a decimal point, one digit and a space for up to
±399.9 Km/Hr. Note: The field is filled with asterisks when the data is invalid. ("****.*")
7.
A ten character string representing the Latitude starting with a "+" or a "-", followed by
two digits, a decimal point, five digits and a space for up to ±89.99999 degrees. Note: The
field is filled with asterisks when the data is invalid. ("+**.*****")
8.
A eleven character string representing the Longitude starting with a "+" or a "-", followed
by three digits, a decimal point, five digits and a space for up to ±179.99999 degrees. The
field is filled with asterisks when the data is invalid. ("+***.*****")
9.
A six character string representing the Altitude by five digits and a space for up to 21500
feet. The field is filled with asterisks when the data is invalid. ("*****").
10.
The string is terminated by a carriage return. There will then be a short interval with no
data transmission before the next string begins.
Watson Industries, Inc.
DMS-SGP02 Rev K 03/22/2018
7
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