- 4 -
ft634aTRC-eng (06.02.2014)
Kompetent für Elektroniksysteme
- 5 -
ft634aTRC-eng (06.02.2014)
Kompetent für Elektroniksysteme
Transmitter control
The transmitter control is activated as soon as the AC-line receives and decodes the pilot tone. Then
the PTT-output is switched by a potential-free relay. The PTT-output can also be controlled by DC- or
AF-decoding (register 053/1).
Functions of the LEDs
The
green LED
is on when the TRC sequence is decoded by the AC-line or a DC potential is applied
or AF is decoded depending on the configuration. The green LED blinks when there is a decoding
but the switching of the transmitter relay is suppressed.
The
yellow LED
is on when the pilot tone was activated or DC applied to the line or the AF connected
to the line. The yellow LED blinks when the activation of one of the afore-mentioned functions is
suppressed.
Examples
LED green
transmitter relay on
because
- Pilot tone was decoded or
- DC was decoded or
- AF was decoded
(blinking see description)
LED yellow
- Pilot tone turned on or
- DC applied and
- AF connected to the line
(blinking see description)
2 or 4
FT634a TRC
Major 4a or 5a
Example 1:
2- or 4-wire remote control via private lines
TRC- or DC- remote control