Timpdon Electronics Tel: 0161 980 7804 Issue 1 — February 2018
www.timpdon. o.uk Page 6 of 12
Indicator LED
At all times, the GPRX7 indicator LED shows the current o erational
status of the unit.
LED Indication Interpretation
LED Off No ower to GPRX7.
Fast Flash No valid radio ulses detected at ower
[ 5 er second ] u .
Transmitter not on, or not bound.
Very Fast Flash Bind rocedure successful.
[ 15 er second] Normal o eration.
The LED flashes once each time a valid
data acket is received from the
transmitter, normally once every 65 ms.
Slow Flash Loss of valid radio ulses following
[ 1 er second ] normal o eration.
On Power Up
On ower u of the GPRX7, the oint will remain at its current osition
until the first valid data acket has been received from the transmitter.
It will then assume the osition s ecified by the transmitter. As the
transmitter automatically remembers the last valid transmitted setting
before ower off, this will normally result in the oint remaining at its
initial ower u setting.
On loss of Radio Communication
If radio communication is lost, for any reason, during normal o eration,
the oint will remain in its last valid controlled state, until radio
communication is restored or until ower is removed from the GPRX7
and re-a lied.
Timpdon Electronics Tel: 0161 980 7804 Issue 1 — February 2018
www.timpdon. o.uk Page 7 of 12
Auxiliar Output Operation
Once calibrated, the GPRX7 will change the state of the controlled oint
in accordance with the transmitted Set and Reset instructions for that
oint.
In addition, however, it will change the state of the Set and Reset
auxiliary outputs to corres ond to the point setting, to ermit
automatic o eration of signals associated with the oint.
Both of these out uts are active low - that is to say they generate a
voltage of +5V [ igh] when inactive, and a voltage of 0V [Low] when
active. This ermits each auxiliary out ut to drive either a LED, for a
colour light signal, or an external Timpdon Electronics ServoSwitch,
model SCS1, to control a further servo for a semaphore signal. Wiring
diagrams for each ty e of signal are given below.
To ermit realistic automatic control of both signals and oints, the
order of o eration, for both Point Set and Point Reset is:
Point Set
•
The Reset auxiliary output is immediately switched to igh =
Danger.
•
After a 1 second delay, the point starts to move to the Set
osition.
•
Once the point has reached the Set osition, the Set auxiliary
output is switched to Low = Clear, after a further 1 second
delay.
Point Reset
•
The Set auxiliary output is immediately switched to igh =
Danger.
•
After a 1 second delay, the point starts to move to the Reset
Position.
•
Once the point has reached the Reset osition, the Reset
auxiliary output is switched to Low = Clear, after a further
1 second delay.
The timing diagram for both directions of o eration is shown below.
Note that once a Set or Reset command has been issued by the transmitter, the
com lete sequence described above will be erformed. If a further transmission,
for the opposite setting, is made before com letion, the initial sequence will first
be com leted and then, after a delay of 1 second, the o osite sequence will be
initiated.
