Campbell Scientific TX312 High Data Rate GOES Transmitter - Manual (Page 27)

TX312 Transmitter
Error code 18 (0x12), message abort due to power supply, indicates the
transmitter power supply did not provide enough voltage. Check system
battery. If the system battery is low, the RF power supply will not be able to
operate properly. The loaded battery voltage must not drop below 10.8 volts.
Error code 19 (0x13), Software error, indicates the transmitter was not able to
run its internal software.
Error code 20 (0x14) is the Failsafe error. The failsafe is an internal hardware
circuit that will shut down the TX312 if it transmits too frequently or for too
long. The failsafe error code is not logged until the transmitter tries to transmit
after the failsafe has been tripped. The transmitter only trips the failsafe when
a serious hardware failure has occurred. Failsafe limits are different for
different baud rates. At 1200 baud, transmission cannot exceed 105 seconds or
repeat more often than every 30 seconds. At 100 baud, transmission cannot
exceed 270 seconds or repeat more often than 60 seconds. At 300 baud, same
transmission on time as 100 baud, but cannot repeat more often then every 30
seconds. The Failsafe can be reset by pressing and holding the reset switch for
10 seconds.
Error code 21 (0x15) indicates the transmitter missed a GPS fix, but does not
guarantee a missed a transmission. See Section 6.3 for GPS antenna
information.
Error code 22 (0x16) indicates a Standing Wave Ratio (SWR) Fault. The
SWR fault can be triggered by several different conditions. High reflected
power will trigger the SWR fault. Reflected power is caused by poor
transmission antenna and/or antenna cable condition or wrong type of antenna
or antenna cable. See Section 6 for transmission antenna information. Ice
buildup on an antenna can change the antenna properties, which can cause
excessive reflected power. Corrosion in connectors, water in antenna cables,
metal in close proximity to the antenna, and a damaged antenna can also cause
excessive reflected power.
The SWR fault can also be triggered by a low battery. If the transmitter cannot
generate enough transmission power, the SWR fault will trip. Always check
the system battery if there has been an SWR fault. This condition is indicated
by low reflected power.
To determine if the reflected power is too high or low, read the last message
status information. When the reflected power number is divided by the
forward power number, the result should be 0.5, with limits of 0.4 to 0.6. See
Section 5.1.2.3 for details on the Last Message Status command.
5.1.3 GoesGPS
Example:
Public GPSdata(6), GPStime(7)
GoesGPS(GPSdata(), GPStime())
The instruction GoesGPS() returns two arrays of information. The first array
is six elements long. The second array is seven elements long. The first array
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