Page 5–2 Stellar
®
SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
Chapter 5: Communications
sR55 commuNIcATIoNs oVeRVIeW
modbus serial CommuniCaTions overvieW
All SR55 soft starters have a built-in RJ12 serial port that can be used to configure and to
control one SR55 from one RS-485 master controller, with no additional communications
components required (other than RS-485 cabling). Multiple SR55 soft starters can be
controlled from a single RS-485 master controller with the use of one optional serial Modbus
communication splitter (SR55-SPLT) per soft starter. An RJ45 female to RJ12 male cable
adapter (SR55-RJ45-RJ12) is available for easier cable connection. Examples of Modbus
masters are SR55-KPD-REM, PLC, or HMI.
modbus TCp neTWork CommuniCaTions overvieW
Multiple SR55 soft starters can be networked for configuration and control from a single
Modbus TCP master controller. This type of network control requires one optional Modbus
TCP communication module (SR55-CM-MODTCP) per SR55 soft starter.
eTherneT/ip neTWork CommuniCaTions overvieW
Multiple SR55 soft starters can be networked for configuration and control from a single
EtherNet/IP master controller. This type of network control requires one optional EtherNet/IP
communication module (SR55-CM-ENETIP) per SR55 soft starter.
For communications, ensure that the SR55 “Timeout” parameter setting is > o. Otherwise,
the SR55 will fault as soon as communication is enabled. (Home --> Device --> Networks -->
Timeout ms)
If using Modbus RTU / Modbus TCP / EtherNet/IP communication for control, the Digital
Inputs are disabled. The Digital Outputs will still function as configured.
If using Modbus RTU / Modbus TCP / EtherNet/IP communication for monitoring only, then
the Digital Inputs and Outputs will function as configured if the Control Method is set to User
Programmable, Two Wire, or Three Wire control.
If using Modbus RTU (RJ12 port) for communications, an SR55-CM-xxxx module must NOT be
installed in the bottom communication port. The presence of a communications module will
cause interference with the Modbus RTU communications.
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