MJ-X Communications Module
1
1 Introduction
This manual describes the installation and connection procedures for the MJ-X
Communications Modules.
Information is provided for both Version 1 and Version 2 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 Tap
Changer Control Panels.
1.1 Description
The Siemens MJ-X Communications Module is the communication interface used to connect the MJ-X 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 Version 2 Communications Modules.
Figure 1-2 illustrates the Version 1 Communications Modules (to be discontinued mid-1999).
The fiber optic module enables connection of the tap changer control panel to the supervisory equipment via multi-
mode 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 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.
POWER
Watchdog
Communications
Rxd
Txd
GND
RTN
-
+
Rxd
Txd
CTS
RTS
Data
RS-232/485
Fiber Optic
Communications Module
Communications Module
RS-232/485 Unit
Fiber Optic Unit
Figure 1-1 MJ-X Communications Modules, Version 2 (Permanent Mount)
Summary of Contents for MJ-X Series
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