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EuroPak-15a Receiver User Manual Rev 5 107
Chapter 8 Built-In Status Test
8.1 Overview
The built-in test monitors system performance and status to ensure the receiver is operating within its
specifications. If an exceptional condition is detected, the user is informed through one or more indicators. The
receiver status system is used to configure and monitor these indicators:
1. Receiver status word
2. Error strobe line
3. RXSECSTATUS log
In normal operation the error strobe is driven low. When an unusual and non-fatal event occurs (for example,
there is no valid position solution), a bit is set in the receiver status word. Receiver operation continues
normally and the error strobe remains off. When the event ends (for example, when there is a valid position
solution), the bit in the receiver status word is cleared.
When a fatal event occurs (that is, in the event of a receiver hardware failure), a bit is set in the receiver error
word to indicate the cause of the problem. Bit 0 is set in the receiver status word to show that an error occurred
and the error strobe is driven high. Receiver tracking is disabled at this point but command and log processing
continues to allow you to diagnose the error. Even if the source of the error is corrected at this point, the
receiver must be reset to resume normal operation.
8.2 Receiver Status Word
The receiver status word indicates the current status of the receiver. This word is found in the header of all logs.
See also Section 4.3, Log Formats on Page 35.
8.3 Error Strobe Signal
The error strobe line is one of the I/O strobes and is driven low when the receiver is operating normally. When
the receiver is in the error state and tracking is disabled, the error strobe is driven high. This can be caused by a
fatal error or by an unusual receiver status indication that the user has promoted to be treated like a fatal error.
Once on, the error status will remain high until the cause of the error is corrected and the receiver is reset.
8.4 Receiver Status Log
8.4.1 Overview
The Receiver Status log (RXSECSTATUS) provides information on the current system status and configuration
in a series of hexadecimal words.
The status word is the third last field in the RXSECSTATUS log as shown in Figure 12 on Page 108. It is also
the third last field in the header of every log.