Installation & Operation Manual Proven Quality since 1892
ECON actuator Fig. 7907, type ELA80 – 3000 www.eriks.com
Rev.23 – August, 2023 38
MBRSM is based on the 2 wire (half-duplex) RS-485 communication, the network length limit or
the number of station should follow the standards of the RS-485 communication. To extend the
network, such as adding another segment, repeaters can be used. To ensure stability of the
network system, the network redundancy can be configured to slave redundancy.
• ModBus manages the access of data simply and flexibly. ModBus supports two data types: A
Boolean value and an unsigned 16-bit integer. Generally, it is common for field devices to have
certain values defined as inputs while other values are outputs, such as current temperature or
valve position.
6.2.1 Specification
• Communication Protocol: ModBus-RTU according to IEC 61158 and IEC 61784
• Topology: Line topology with termination
• Number of nodes: 32 nodes in each segment without repeater, with repeaters expandable to 247
• Number of repeaters: Max. 9 with signal refreshing
• Cable length: Max. 1.2 Km with Repeater 10 Km
• Transfer Mode: RS-485
• Transmission Medium: Twisted, shielded 2-Wire cable according to IEC 61158
• Bus Access: Polling between master and slaves (query response)
• Supported Baud Rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
• Supported Parity Bit: Odd, Even, None
• Supported Stop Bit: 1, 2
For more detail information, please refer to separate ModBus operation manual.
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