![Funk-Electronic Piciorgros RTU-81 User Manual Download Page 23](http://html1.mh-extra.com/html/funk-electronic-piciorgros/rtu-81/rtu-81_user-manual_2346370023.webp)
Funk-Electronic Piciorgros GmbH
RTU-810
V2.30 - Page 23 of 126
RF
These eight LED indicate the field strength of the received radio
signal.
They always show the current occupation of the configured radio
frequency, which includes any transmitter on that frequency. This
can be used to watch the occupation by other radios and/or
interferences.
A configurable Peak Hold display (default on) shows the RF field
strength of the last data telegram which was addressed to the
certain RTU-810. This gives always a view about the relevant
RSSI value of data addressed to the device. If the latest received
data is older than 15 minutes or if the device was restarted, this
peak hold value flashes.
The RSSI display is calibrated to show RSSI values between -
115dBm and -60dBm and above.
If the RTU-810 has a GSM option, the RSSI display can be
switched to show the GSM field strength.
F1 (green)
If the RTU-810 operates in time slot operation, this LED shows
the sync status of the time source (SNTP or DCF-77/PTS-100 time
server):
Permanently on: The time synchronization is up to date and time slot
operation can be used
Mostly off with an on-blip every second (DCF/PTS-100 only): The
RTU-810 is waiting for the second 0. Time slot operation will not
work in this state.
500ms flash every second (appears as 1:1 flash, DCF/PTS-100 only):
The RTU-810 is decoding time information from the DCF-77 antenna
or PTS-100 time server. Time slot operation will not work in this state.
Mostly on, blipping off every second: The last time synchronization is
overdue and the RTU-810 time slot operation is running on internal
reserve. In this mode the time slot will get continuously smaller to
balance the drift of the internal clock. Without synchronization the
timeslot operation will stop after around 3 days.
Off: No time synchronization active, time slot operation will not work
in this state.
If the RTU-810 has a GSM option, this LED indicates IP data flow
over the GSM link.
F2 (red)
If the RTU-810 operates in time slot operation, the LED shows a
current active time slot. The RTU-810 is allowed to transmit as a
master if the LED is on.
If the RTU-810 has a GSM option, this LED shows an active PPP
(IP) link to the GSM network.