MJ-X Communications Module
5
RTU
RTU
RTU
MJ-X
MJ-X
MJ-X
MJ-X
MJ-X
MJ-X
MJ-X
MJ-X
MJ-X
Twisted-pair
Cabling
4000 ft max. total
Twisted-pair
Cabling
4000 ft max. total
Twisted-pair
Cabling
4000 ft max. total
Figure 2-4a RS-485 Configuration - Loop Network
Figure 2-4b RS-485 Configuration - Star Network
Figure 2-4c RS-485 Configuration - Open-Ended Network
2.3 Communication
Protocols
The MJ-X Control Panel can be used in a network of intelligent power control devices communicating with a
supervisory device or remote terminal unit (RTU). Each device on the network has a specific communications
address assigned to allow messages to be directed to and from the device. Messages are transmitted from the RTU
to all devices and only the device with the specified address will respond. The MJ-X Communications Module
supports the following protocols.
•
Distributed Network Protocol (DNP 3.0) (Based on the IEC 870-5 Standard)
•
The “Data 2200” Protocol (with or without address byte)
•
MJ-3A Format “A”, “B1”, and “B2”
•
The 2179 Protocol ( Based on the PG&E Protocol)
•
Other (contact the factory for the latest list of supported protocols)
3 Installation (Version 2)
The MJ-X Communications Modules install in the back of the MJ-X Control Panel. Before installing the
communications module, set the jumpers on the communications module printed circuit board for proper operation.
Install the communications module in the MJ-X, connect the cables, and test the unit. Once these tasks have been
Summary of Contents for MJ-X Series
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