Rohde & Schwarz 1141.2005.02, Quick Start Manual

Page: 138 / 144

Hardware Interfaces
R&S
®
SMU200A
121 Quick Start Guide 1007.9822.62 ─ 13
Table 1-2: Pin assignment of the AUX I/O Connector connector
Pin Signal Description
1 .. 25
Ground
⊥
Ground
26 LEV ATT Signal input/output for controlling the level attenuation.
For two-path instruments, the signal for Path B can be applied to one of the
USER interfaces.
With external envelope curve control ("Custom Digital Modulation" only), the
pin is the input for the control signal LEV_ATT.
With internal envelope curve control, the control signal LEV_ATT is output
for Path A.
27 CW MODE Signal input for controlling the switchover between the modulated and
unmodulated RF signal with activated external modulation/CW switching in
the "Custom Digital Modulation" menu.
For two-path instruments, the CW control signal affects Path A and/or Path
B.
Signal output for the CW control signal with internal source selected. This
signal marks the CW mode in which digital modulation is deactivated and the
RF signal is output in unmodulated form. In the case of digital standards with
selectable modulation mode, the signal indicates the active modulation mode
(GSM: (G)MSK = high, 8PSK EDGE = low).
28 INST TRIG B Input for external triggering of the analog modulations, sweeps and List mode.
HOP input for controlling the frequency hopping mode with external source
in List mode (Path B).
The instrument trigger input for Path A is input via the DIGITAL I/O interface.
29 .. 38 PARDATA0 ..
PARDATA9 Parallel data input/output 0...D with 10-bit word width for digital modulation.
If the data source "External Parallel" is selected, these pins are the data
inputs.
If a different data source is selected, the data is output here ("Custom Digital
Modulation", Path A).
39 USER 3 USER input/output which can be configured for various purposes.
40 USER 4 USER input/output which can be configured for various purposes.
41 MARKER 3 Output for the freely programmable marker signal 3 of Path A. The output is
permanently assigned.
42 MARKER 2 B Output for the freely programmable marker signal 2 of Path B.
43 MARKER 3 B Output for the freely programmable marker signal 3 of Path B. The output is
permanently assigned.
44 not used not used
45 BURST Signal input/output for controlling the burst ramp.
For two-path instruments, the signal for Path B can be applied to one of the
USER interfaces.
With external envelope curve control ("Custom Digital Modulation" only), the
pin is the input for the control signal "BURST_RAMP".
With internal envelope curve control, the control signal "BURST_RAMP" is
output for Path A.
46 EXT TUNE Tuning input for the internal reference frequency.
AUX I/O Connector