R&S 4200 Series Operating Manual page 204

R&S XU 4200
Entry in column D (direction): O = Output
Entry in column T (type):
Signal description
SER_CONTR_TXD_A
SER_CONTR_TXD_B
SER_CONTR_RXD_A
SER_CONTR_RXD_B
USER_OUT
USER_IN
RX Input X8\RX Input X8 "Radio".doc
6166.5368.02.01
I = Input
A = Analog D = Digital
D T Range
RS-422 / RS-485
O D
Ri = 120 Ω (a-b)
O D
Max. ± 6.8 V
I D
against GND
I D
O D Ri = 220 Ω
CMOS 3.3 V
I D Contact against
GND = active
Internal pull-up 10 kΩ
to 3.3 V, limited to
max. 6.8 V
B = Bi-directional
P = Power
Contact
X7.10
X7.11
X7.12
X7.13
X7.14
X7.15
6.8
Interface Description
Remarks
RS-422 / RS-485 interface
to Telsa external
automatic filter only
If "User Contact Warning"
is enabled and the input
USER_IN (X11.15) is
"high" (e.g. input open),
the radio will send a
USER CONTACT
WARNING 0430 to the
remote control system.
If "User Contact Warning"
is enabled and the input
USER_IN (X11.15) is
"low" (input connected to
GND), no warning will be
send to the remote control
system.
Note: If "User Contact
Warning" is disabled, no
warning will be send to the
remote control system.