Communications Menu Item Descriptions; Troubleshooting Communications Problems - Siemens MJ-XL Installation Manual

7.5.1 Communications Menu Item Descriptions

Data Stat, DatPortBaud, and Data Parity
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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
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This item defines the protocol selection for the MJ-X Communications Module. The selections are listed in Table
7-4 on page 22.
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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
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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
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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 one 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 configuration item defines the Communications Module Transmit Enable Delay (in milliseconds). Specifies
the amount of time between the RTS output being activated and the start of transmit (output) data.

7.6 Troubleshooting Communications Problems

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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
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parameters via the MJ-X Control Panel.
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