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MJ-X Communications Module
6.5.1 Communications Menu Item Descriptions
Data Stat, DatPortBaud, and Data Parity
These menu items apply only to the Data Port located on the front of the MJ-X Control Panel, and do not require
modification.
Reg Id (Regulator Identification)
This item allows you to uniquely identify each regulator in the system. The Regulator Id is accessible as a data item
via the communications module for most of the protocol selections.
Protocol
This item defines the protocol selection for the MJ-X Communications Module. The selections are listed in Table
6-4 on page 23.
2200NOA is a variation of the 2200 protocol with the address field suppressed. It is provided for testing the MJ-X
Communications Module with the MJXplorer software. The SPECIAL item allows a new protocol handler to be
included in the Comm Module code without forcing a modification to the Main Processor code (for the protocol-
selection front panel screen).
Comm Baud
This menu item defines the data rate for the MJ-X Communications Module. The standard asynchronous
communications data rates are available for selection. For proper communications, the Comm Baud setting must
match the baud setting of the other communicating device(s) in the network.
Comm Parity
This configuration item defines the parity selection for the communications module. For proper communications,
the Comm Parity setting must match the parity setting of the other communicating device(s) in the system.
This parity selection will override any default or inherent parity defined in the selected protocol. [For example, the
2200 protocol specification document defines the parity as even. The Comm Parity configuration item allows even
parity to be selected, but it also permits the system designer/installer to use an alternate parity selection if desired.]
Comm Address
This configuration item defines the communications address for the communications module. Each device
connected on the communications link must have a unique communications address. The Comm Address setting
must correspond with the address programmed into the RTU or other supervisory device so that it can request
information from and write data to a particular MJ-X Control Panel.
Resync Time
This configuration item defines the Communications Module resync time (in characters). This item is used for
Communications Module protocols 2200 and 2179 to determine when a message ends and another message begins.
If a new character is not received within the period specified by this parameter, the control panel assumes that the
next received character is the start of a new message.
Tx En Delay
This item defines the Communications Module Transmit Enable Delay (in milliseconds). Specifies the amount of
time from RTS activation to the start of transmit (output) data. Set for a minimum of 1 millisecond.
6.6 Troubleshooting Communications Problems
This section explains how to troubleshoot the MJ-X Communications Module using the front panel LED indicators
and the MJXplorer software. The MJXplorer software allows you to access the communications module parameters
via the MJ-X Control Panel.
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