Unit installation

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

AGND -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

N EXT FLT1 #A TWT FLT input for primary channel

P EXT FLT1 #B TWT FLT input for secondary channel

RN/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.