
Doc. ref :
333130A-EN
2018/01/05
Page 27 / 44
DRAFT R revision5
8
Options
Switch RF control option
8.1
For
RSEF
with sales reference:
RSEF••-1
This option allows to ensure continuous radio link in a congested RF environment (reflection, shadow zones...) by
controlling an RF switch to transmit radio waves from two separate antennas.
We recommend using a RF switch type
ZSDR-230+
for example.
The transmitter
RSEF
is fitted with 2 extra outputs, terminals
29
and
30
, which deliver the power supply for the RF
switch and the TTL output to control the RF switch.
It is necessary to wire a 100 ohms ¼ watts pull-up resistor between the TTL input and the 0v
IMPORTANT :
The maximum length of the cables connecting the
RSEF
and the RF switch should not exceed 30m.
Wiring the RF switch:
8.1.1
RSEF
Terminal
RF switch
connection
Comments
14
TTL
It is necessary to wire a 100 Ohms
pull-up resistor between the TTL
input and the 0v
29
0 V
30
+5 VDC
RF Signal
COM