United Technologies Carrier Unit Vent Open, Integration Manual

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Appendix D: Modbus Protocol Implementation Conformance Statement
Unit Ventilator CARRIER CORPORATION ©2019
Integration Guide All rights reserved
38
Serial Transmission Mode: Supported?
RTU Slave (Slave is the Default Dipswitch setting)
Communication Types: Baud
rates:
Data Bits: Parity: Stop Bits:
2-wire EIA-485,
9600,
19200,
38400,
76800 8 None 1
Function Codes: Purpose: Used with Register
Numbers:
01 – Read Coil Status Read Discrete Outputs 00001 - 09999
02 – Read Input Status Read Discrete Inputs 10001 - 19999
03 – Read Holding Registers Read Holding Registers 40001 - 49999
04 – Read Input Registers Read Input Registers 30001 - 39999
05 – Force Single Coil Write Discrete Outputs (single) 00001 - 09999
06 – Preset Single Register Write Holding Registers (single) 40001 - 49999
15 – Force Multiple Coils Write Discrete Outputs 00001 - 09999
16 – Preset Multiple Coils Write Holding Registers 40001 - 49999
Register Type: Range:
Function Codes Used with this
Register Type:
Float Value (FLOAT)
Single-Precision IEEE floating point
value
3 – Read Holding Register
6 – Preset Single Register
16 – Preset Multiple Register
Unsigned Integer (UINT) 0 - 65535
3 – Read Holding Register
6 – Preset Single Register
16 – Preset Multiple Register
Signed Integer (SINT) -32768 - 32767
3 – Read Holding Register
6 – Preset Single Register
16 – Preset Multiple Register
Discrete Input (DI) 0 = Off, 1 = On 2 – Read Input Status
Discrete Output (DO) 0 = Off, 1 = On
1 – Read Coil Status
5 – Force Single Coil
15 – Force Multiple Coils
Appendix D: Modbus Protocol Implementation Conformance Statement