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6–2
1st Ed, Rev B 07/31/2019
SR44 Series Soft Starter User Manual
6.1 – Overview
The SR44 has built-in serial communication capability that is a compatible subset of the widely
recognized Modbus RTU protocol (slave), and the SR44 may be connected to a PC or suitable PLC
network via an optional SR44-RS485 interface card.
6.2 – Quick Start
Work should only be carried out on the SR44 with all electrical power disconnected
1) Communication settings:
a) 9600 baud, 8 data bits, 1 stop bit, no parity.
b) network station number = 1.
2) Before Connecting a Comm interface, use the standard keypad to make any changes for your
bus system:
a) Set Parameter 1 to the required network station number (slave address).
b) If not continously polling the unit at least once every 5 seconds, set P-126 to 0, turning off comms
timeout trip
c) Make any changes to Parameter 121, bit 6.
0 = 1 Stop bit.
1 = 2 Stop bits
d) Store changes to EEROM (save RAM).
3) The Local/Remote switch must be set to “Remote” to use the optional communication interface
SR44-RS485. When this switch is set to “Local”, serial communication is ignored and the
integrated local keypad controls the soft starter. (Refer to “Chapter 7: Optional Hardware” for
information about installing and using the optional Local/Remote switch.)
4) Register and coil addresses start at zero.
Allowed address ranges are Register numbers 0…127, EEPROM Registers 1000…1127, Coils (flags)
0…1024.
(Refer to the “Parameter Memory Addresses” section of this chapter for more information.)
SR44 has a Modbus offset of one address for registers and bits. PLC programs should target one address
higher than desired, e.g., PLC targets SR44 address 40019 to read/write to/from address 40018 (P-18).
Serial communication requires an optional interface card (SR44-RS485), which includes a “Local/Remote”
switch to easily switch starter control from communication to keypad.
Serial communication is valid only in the “Remote” position, and the local keypad powers down.
In the “Local” position, the local keypad powers up and controls the soft starter, and all serial
communication is ignored.
WARNING: The owner, installer, and user are responsible for the correct installation and use of the
SR44, and must ensure that only qualified personnel install the SR44. The owner, installer, and user must
ensure that the installation, operation and maintenance of the SR44 complies with the relevant Codes of
Practice, Regulations, and Statutory Requirements. The Manufacturer or his agent do not assume any
liability, expressed or implied, for any consequence resulting from inappropriate, negligent, or incorrect
installation, application, use or adjustment of the product or circuit design, or from the mismatch of the
SR44 to a motor. To prevent an electrical shock hazard, the SR44 must be properly connected to a safety
ground. The SR44 is not designed for use in hazardous areas. Use in such an area may invalidate the
hazardous area certification.
Chapter 6: Serial Communications