R&S 4200 Series - RX Audio Extended X11

R&S XU 4200 Interface Description
6166.5368.02.01 6.12
6.2.11 RX Audio Extended X11
DSUB female (15 pins)
Fig. 6.11 RX audio extended X11.
Entry in column D (direction): O = Output I = Input B = Bi-directional
Entry in column T (type): A = Analog D = Digital P = Power
Signal description D T Range Contact Remarks
+28 V O P X11.1
+28 V O P
19 to 32 V
X11.2
DC supply for external
filter (external device)
Max. 2 A (peak 4 A)
protected PTC
Note: Maximum current in
sum with X5.6, X7.1/X7.2,
and X10.6
GND B P Ground X11.3
GND B P Ground X11.4
EXT_RSSI I P 0 to 5 V
limited to max . 6.8 V
R
L
= 18 k
X11.5 Input of the External RSSI
signal (for Main/Standby
switchover based on RSSI)
USER_OUT1 O D Ri = 220 
CMOS 3.3 V
X11.6
/AF_INHIBIT I D Contact against
ground (low) =
inhibit RX audio
Internal pull-up 10 k
to 3.3 V, limited to
max. 6.8 V
X11.7 Mute RX audio
RSSI O A 0 to 5 V
corresponds to
−120 to +10 dBm
X11.8 Received signal strength
indication
GND – – X11.9
SER_CONTR_TXD_A O D X11.10
SER_CONTR_TXD_B O D X11.11
SER_CONTR_RXD_A I D X11.12
SER_CONTR_RXD_B I D
(Reserved)
X11.13
(Reserved)
1
8
15
9