Getting Started
R&S
®
FSW
56User Manual 1173.9411.02 ─ 19
Since the Digital I/Q input and the Analog Baseband input use the same digital signal
path, both cannot be used simultaneously. When one is activated, established connec-
tions for the other are disconnected. When the second input is deactivated, connec-
tions to the first are re-established. This may cause a short delay in data transfer after
switching the input source.
For more information on the Digital Baseband Interface (R&S FSW-B17) and typical
applications see the R&S FSW I/Q Analyzer User Manual.
3.2.2.10 TRIGGER 3 INPUT/ OUTPUT
The additional female BNC TRIGGER INPUT / OUTPUT connector can be used to
receive a third external signal or to provide a signal to another device. The signal is
TTL compatible (0 V / 5 V). You can control the connector usage in the "Trigger" set-
tings (TRIG key).
3.2.2.11 SYNC TRIGGER OUTPUT/INPUT
The SYNC TRIGGER OUTPUT/INPUT connectors allow you to synchronize several
devices (e.g. two R&S FSWs) with respect to the trigger signal, but also the reference
frequency. A 100 MHz signal can be output as a trigger or reference signal to another
device, and an external trigger or reference signal can be received at the input connec-
tor by the R&S FSW.
3.2.2.12 AUX PORT
The 9 pole SUB-D male connector provides control signals for controlling external devi-
ces. The voltage levels are of the TTL type (max. 5 V).
Pin Signal Description
1 +5 V / max. 250 mA Supply voltage for external circuits
2 to 7 I/O Control lines for user ports (see User manual)
8 GND Ground
9 READY FOR TRIGGER Signal indicating that the instrument is ready to
receive a trigger signal (Low active = 0 V)
Short-circuit hazard
Always observe the designated pin assignment. A short-circuit may damage the instru-
ment.
Instrument Tour
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