R&S OSP
Applications
Operating Manual 1505.3896.12 - 14
193
+28 V
Door contact
2
6
9
3
Interlock LED
Interlock Loop
OSP-B114
IN
OUT
Power Amplifier 1
Interlock
Security
Loop
PA Interlock Control 1
+28 V
Power Amplifier 2
Interlock
Security
Loop
PA Interlock Control 2
7
3
4
8
Figure 8-8 Interlock wiring with Module R&S OSP-B114
8.6.3 I/O Ports on the R&S OSP-B114 Module
The module R&S OSP-B114 offers four Input / Output ports which can be used for any
customer application. In the following a proposal for remote control of antenna
polarisation.
Input ports:
The input ports of the module R&S OSP-B114 are designed for LVC (Low Voltage
CMOS) logic but can be operated with TTL level up to 5 V as well.
Control circuits like the interlock loop as it is used for EMS systems, often make use of
control voltages up to 28 V DC. It is possible to connect the R&S OSP-B104 input to
circuits with up to 28 V when the following points are observed.
The input lines of the R&S OSP-B104 must be connected with a resistor in series if
voltages > 5 V and
28 V DC are applied.
Risk of module damage
The maximum voltage to be directly applied to the module R&S OSP-B114 input lines
is TTL level. For voltages up to 28 V DC, a resistor has to be used in series with a
minimum of 22
kΩ.
For more details, see the drawing in
Output ports:
The output ports of the module R&S OSP-B114 are designed as FET driver switching
to GND when activated. Each output is protected with diode against transients which
may occur when switching inductive loads such as relay coils.
One output port can draw a maximum of 200 mA.
