13 gnd (erde) – Comtech EF Data RSU-503 User Manual
Page 38
Installation
RSU-503 Redundancy Switch Unit
22
Rev. 8
The MTI connector is a 26-pin circular female connector with the following pinouts:
Pin #
Name
Function
RS-232
RS-485
A
GND
-RX/TX
B
-RX/TX
C
+RX/TX
D
CTS
+RX/TX
Clear to Send
E
RD/RX
Receive Data
F
RTS
Ready to Send
G
TD/TX
Transmit Data
H
DSR
Data Set Ready
J
GND
Ground
K
Reserved
L
EXT_PWR
Output, 11V for KP-10
M
N
EXT FLT1 #A
TWT FLT input for primary channel
P
EXT FLT1 #B
TWT FLT input for secondary channel
R
N/C
S
Ground
Chassis Ground
T
Reserved
U
Reserved
V
Reserved
W
Reserved
X
FLT NC
Summary fault relay, connects to COM with fault
Y
FLT COM
Summary fault relay, COMMON
Z
FLT NO
Summary fault relay, opens with fault
a
Reserved
b
Reserved
c
Reserved
Note: Clear to Send (CTS) is tied to Ready to Send (RTS) in RS-232 mode.
2.4.13 GND (ERDE)
GND is a #10-32 stud for the purpose of connecting all units to a common chassis
ground.