Configuring For Modbus Rtu - Carrier WSHP Open v3 Integration Manual

The following example shows the DIP switches set for 76.8k (Carrier default), and MS/TP.
Connect the MS/TP network to the controller's J19 port. Connect to Net+, Net-, and SHLD.
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Wire specifications
A dedicated 22 AWG shielded twisted pair wire (EIA 485)
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Maximum wire length 2000 feet (610 meters) or 32 nodes
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Devices should be daisy-chained and not star-wired
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Attach the drain/shield wire to both ends of the network segment and through every controller
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NOTE Use the same polarity throughout the network segment.
Turn on the WSHP Open's power.
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Configuring for Modbus RTU

Refer to Appendix C (page 33) for the Modbus Protocol Implementation Conformance Statement (PICS).
Turn off the WSHP Open's power.
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NOTE Changes made to the switches when the controller is on will not take effect until the power is cycled!
Using the rotary switches, set a unique Modbus slave address for the WSHP Open. Set the MSB (SW1) switch
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to the tens digit of the address, and set the LSB (SW2) switch to the ones digit. Valid Modbus slave
addresses are 01-99.
EXAMPLE To set the controller's Modbus slave address to 01, point the arrow on the MSB (SW1) switch to 0
and the arrow on the LSB (SW2) switch to 1.
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