Introduction
Topcon GR-5 Quick Start Guide
4
• Green blink – receiver is on and tracking satellites; one
blink per tracked GPS satellite.
• Orange blink – receiver is on and tracking satellites; one
blink per tracked GLONASS satellite.
The REC LED displays the data recording status.
• Green blinks – each blink indicates that data is being
written to the SDHC card.
• Solid Orange – the receiver is changing modes.
• Orange blinks – the receiver is checking its internal file
system. 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 – a fault condition with the receiver (no more
memory, no SDHC card inserted, a hardware problem,
or an improper OAF).
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