Introduction
GR-3 Operator’s Manual
1-12
The REC LED displays the data recording status. See “The FN
button” on page 1-13 for more information on REC LED behavior
when using the FN button.
• Green blinks – each blink indicates that data is being written to
the SD/MMC card.
• Solid Orange – indicates the receiver is changing modes.
• Orange blinks – indicates that the receiver is checking its internal
file system (after clearing the NVRAM or loading new firmware).
During this operation, the file system is not accessible for CDU
(control display unit) applications or for data recording. This
operation may require from fractions of a second to several
minutes, depending on the circumstances and the amount of
internal memory.
• Solid Red – indicates a fault condition with the receiver (no more
memory, no SD/MMC card inserted, a hardware problem, or an
improper OAF).
Table 1-2 on page 1-14 describes the REC LED status when using the
FN button.
The RX TX LED displays the status of the modem. Table 1-1
describes the LED colors and patterns for the different modems
available for the GR-3 receiver.
Table 1-1. RX TX LED Indications
FH915 Plus
Modem
• No light – modem is turned off.
• Green flashes – modem is in receiver mode.
• Solid Green – a radio link has been established; modem is
ready to receive data.
• Solid Green plus Red flashes – modem is receiving data.
• Solid Red – modem is in transmitter mode.
• Red flashes – a fault condition has been detected. Check the
condition of the radio modem’s antenna to ensure it is
undamaged, and is connected properly and securely. Also make
sure nothing interrupts the signal.
• Red flashes plus Green flashes – modem is in command mode.
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