MJ-X
L
Communications Module
1
1 Introduction
This manual describes the installation and connection procedures for the MJ-X
L™
Communications Modules.
Information is provided for both Fiber Optic and RS232/485 Communications Modules. The operation and
functionality of both versions are quite similar; the mechanical configurations and installation procedures are
different. The manual also covers the procedures for connecting the module to a system of networked MJ-X
L
Tap
Changer Control Panels.
1.1 Description
The Siemens MJ-XL Communications Module is the communication interface used to connect the MJ-X
L
Control
Panel to a network of regulator controllers, control devices, and supervisory equipment. The module is available
with either a fiber optic or RS-232/485 interface. Figure 1-1 illustrates the Fiber Optic Communications Module.
Figure 1-2 illustrates the RS-232/485 Communications Module
The fiber optic module enables connection of the tap changer control panel to the supervisory equipment via
multimode fiber optic cable. The RS-232/485 module enables connection of the tap changer control panel to the
supervisory equipment via electrical wire.
The communications modules are installed in MJ-X
L
Tap Changer Control Panels. This allows you to easily
network the control panels and other field devices to a remote terminal unit (RTU) or other supervisory device. An
adapter kit is available for mounting MJ-X
L
Communications Modules in MJ-X Control Panels.
In
Out
Rxd
Txd
POWER
Watchdog
Communications
Fiber Optic
Communications Module
Figure 1-1 MJ-X
L
Fiber Optic Communications Module
Rxd
Txd
POWER
Watchdog
Communications
RS - 232 / 485
Communications Module
G
N
D
R
T
N
-
+
R
x
d
T
x
d
C
T
S
R
T
S
Data
Figure 1-2 MJ-X
L
RS-232/485 Communications Module
1.2 Front Panel LED Indicators
The MJ-X
L
Communications Module has five LED indicators.
•
Power
indicates the MJ-X
L
Communications Module is powered on.
