9.8
SEL-2032 Communications Processor Instruction Manual Date Code 20120126
Protocols
Modbus RTU Protocol
Figure 9.2 SEL-2032 Multitiered Application Example
Modbus RTU Protocol
Overview
The SEL-2032 supports the Modbus RTU protocol on Ports 12, 14, and 16 for
access to data from any SEL-2032 port database. The SEL-2032 is a Modbus
slave, not a master. Modbus can access any information within the SEL-2032
database, and can also perform basic control functions.
As shown in Figure 9.3, the SEL-2032 acts as a virtual Modbus network of 18
Modbus slaves. Port 12 acts as an access point to a multidrop network of 18
Modbus devices, each with a unique Modbus slave address. The reason for
this is that each port database contains almost the maximum amount of data
for a Modbus slave. By providing multiple independent Modbus slaves, the
SEL-2032 allows access to every register in every database.
SEL Relay
SEL Relay
Non-SEL Relay
SEL-2032
SEL-2032
Non-SEL Relay
SEL Fast Message
Protocol
SEL Fast Message
Protocol
SEL Fast Message
Protocol
SEL
SEL
SEL Fast Message
Protocol
Courtesy of NationalSwitchgear.com
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