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Optional RS-232 Digital Output
The optional 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 cable for the GGC is included. The RS-232 signal is referenced to signal
ground. The frame rate is 10 strings per second. See Appendices A and B for information on how
to change the unit for this output. The contents of a 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 "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","i", or "r"), an error over-range condition is indicated
This occurs when the calculated attitude or heading errors exceed preset ranges. Internal
functions that require these error values are disabled while the condition exists. The system
will continue to operate in an extended time constant mode with a low level of error
accumulation until the condition is cleared. While maneuvering, occasional blips of this
condition are expected with no detectable effect on the resulting data.
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 twelve character string representing the Latitude starting four digits, a decimal point, five
digits, a comma, followed by an "N" or "S" and a space for up to ±89degrees 59.99999
minutes North or South. Note: The field is filled with asterisks when the data is invalid.
("****.****,*")
8.
A thirteen character string representing the longitude starting with a five digits, a decimal
point, five digits, a comma, followed by a "W" or "E" and a space for up to 179 degrees
59.99999 minutes East or West. 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. ("*****").
Watson Industries, Inc.
GGC-E101 Rev A 08/30/2013
16
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