Automation Direct Stellar SR55 Series User Manual

Chapter 5: Communications
Page 5–3Stellar
®
SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
modbus seRIAl commuNIcATIoNs
modbus rTu CommuniCaTions inTerfaCe
All SR55 soft starters support serial Modbus RTU protocol (slave) communications. The serial
RS-485 communications are accessible from the built-in RJ12 port, as shown below.
16
1: GND
2: Reserved*
3: Not connected
4: Not connected
5: TXD0-A-OUT (SG-)
6: TXD1-B-OUT (SG+)
* Warning: To avoid damage to
the SR55 or to the RS-485 master,
do NOT connect to this pin!
modbus rTu ConneCTions
SR55-xxx
SR55-SPLT
SR55-xxx SR55-xxxSR55-xxx
Single SR55 RS-485 network
(SR55-SPLT optional)
Multiple SR55 RS-485 network
(one SR55-SPLT per starter
recommended)
serial modbus CommuniCaTion spliTTer
Information for the optional SR55-SPLT serial Modbus communication splitter is found in
“Accessories” Chapter 6. (An SR55-RJ45-RJ12 adapter can be used to simplify cabling between
the splitter’s RJ45 ports and the SR55’s RJ12 port.)

Automation Direct Stellar SR55 Series Specifications

General

Brand	Automation Direct
Model	Stellar SR55 Series
Category	Controller
Language	English