TECHNICAL SPECIFICATIONS
COMMUNICATIONS – SERIAL LINK
Page 63 of 67
COMMUNICATIONS – SERIAL LINK
The MPS3000 is equipped with a powerful data communication system, operating beyond a motor protection
controller into the realm of a complete motor management system.
This communication system is unmatched in its reliability, flexibility and ease of use providing the ideal basis for
the design of a modern motor management system.
The MPS3000 incorporates RS485 serial link and uses a MODBUS RTU protocol (The protocol is not included
in this document) to provides high speed data acquisition to supervisory computers.
Data formats have been carefully structured to provide fast notification of alarms and continuous updates of
performance parameters. Load control can be performed from host computers or by PLCs.
The following information and control can be accessed through the communication.
• All Actual data values
• All MPS3000 Parameter Settings (Read & Write)
• All the control commands for the MPS3000-C (such as Start A, Start B, Stop)
• Reset
See MPS3000 Communication instruction manual.
The MPS3000 system is user expandable. No special engineering skills or tools are required.
For small systems, the Host computer can communicate directly with the MPS3000 via a twisted shielded pair.
For larger systems a Data Highway enables multiple MPS3000 connection. Up to 32 MPS3000s can be added
on each twisted pair of the Host serial link with full access to all MPS3000's.
The system also performs high speed data acquisition Users therefore have a simple and friendly means of
building a fully integrated monitoring and control systems.
System reliability is exceptionally high, meeting the highest standards of reliable communication in the industry.
Included in each message is a 16 bit CRC.
Note: Protocols other than MODBUS RTU available upon consultation.
Note: Terminate serial link cable with 120 Ohm resistors at both ends.
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