Application Examples
R&S
®
OSP
238
User Manual 1178.7100.02 ─ 05
Figure 6-10: Interlock wiring with module R&S
OSP-B114
6.3.4
I/O Ports of R&S
OSP-B114
The module R&S
OSP-B114 offers 4 input channels and 4 output channels. You can
use these I/Os for any application-specific purpose, for example for monitoring addi-
tional door contacts (IN) and for remote control of antenna position and polarization
(OUT).
[IN] port
The input channels 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 in typical EMS test systems often use control vol-
tages up to 28
V
DC. You can connect the R&S
OSP-B104 input to circuits with up to
28
V, if you observe the following point (see
):
Do not
overload
the input: for voltages >
5
V
DC up to 28
V
DC, insert a
22
k
Ω
resis-
tor, see
Chapter 2.1.11, "Connecting Control Cables"
[OUT] port
Each output channel of the module R&S
OSP-B114 is designed as a MOS-FET (open
drain) that leaves the channel's pin on high impedance in the inactive state. When acti-
vated, the FET switches the pin to internal ground. Each output is protected by two
TVS diodes against transient disturbances, which can occur when switching inductive
loads, such as relay coils.
Applications of Module R&S
OSP-B114