5
FN Key and REC LED
The Function key (FN) starts and stops data recording. Holding the FN key for more
than 1 and less than 8 seconds will start/stop data recording. The status of data
recording is shown by the REC LED. Data recording is on when REC LED is green;
data recording is off when this LED is off. If REC LED is red, it indicates a hardware
problem with data recording (e.g. memory is full).
The green light of REC LED blinks each time the data is written to the internal file. The
data recording time interval is what has been programmed in the receiver (by a hand-
held interface device or a computer).
Holding the FN key for less than 1 ('click') either switches between different information
modes (normal, extended information, internal modem status), or between static and
dynamic post-processing modes, depending on the receiver' configuration.
Holding the FN key for more than 8 seconds has no impact.
Each time data recording is turned off and on a new file is opened and automatically
named by the receiver (using date and time).
After turning the receiver on, loading a new firmware, or clearing the receiver NVRAM,
receiver checks its internal file system. During this operation, the REC LED flashes
yellow, and the file system is not accessible for CDU applications or for data recording.
This operation may require from fractions of a second to several seconds, depending
on the reason it started and the amount of the internal memory.
How to Clear NVRAM
It is possible to clear NVRAM using only MINTER. To do that:
1. Turn the receiver OFF.
2. Press and hold FN button.
3. Press and release PWR button to turn the receiver ON.
4. Wait until both LEDs will light green.
5. Wait around five seconds, until both LEDs will blink yellow.
6. Release FN button.
Note that LEDs will blink yellow only during next five seconds, and to clear NVRAM it is
essential to release FN button when they blink yellow.
Change Serial A Speed to 9600
MINTER has an option to turn baud rate of serial port A to 9600. To do that, press FN
button and hold until REC LED becomes red (about 5 seconds), then release FN button
while REC LED is red (during next 3 seconds).
Extended Information (EI) Mode
In this mode the receiver continues work as usual, but the STAT LED indicates
extended information, useful for test purpose.
To switch to EI mode click either FN or PWR button on MINTER. 'Click' means push
and quickly release (inside one second). To switch back to normal blinking click either
button once again (two times, if an internal modem is present).
