Appendix C: Modbus Protocol Implementation Conformance Statement - Carrier RTU Open v5 Integration Manual

Appendix C: Modbus Protocol Implementation Conformance Statement

Appendix C: Modbus Protocol Implementation Conformance Statement
Date: 11/12/2013
Vendor Name: Carrier
Product Names: RTU Open
Product Model Number: RTU Open
Protocol Description:
The RTU Open controller speaks the Modicon Modbus RTU/ASCII Protocol as described in the Modicon Modbus
Protocol Reference Guide, PI-MBUS-300 Rev.J. Further details on the Modbus implementation are described
below.
Product Description:
The RTU Open is a factory-installed rooftop controller that is capable of speaking multiple protocols.
Serial Transmission Mode:
RTU
ASCII
Communication
Types:
2-wire EIA-485,
Function Codes:
01 – Read Coil Status
02 – Read Input Status
03 – Read Holding Registers
04 – Read Input Registers
05 – Force Single Coil
06 – Preset Single Register
15 – Force Multiple Coils
16 – Preset Multiple Coils
Register Type:
Float Value (FLOAT)
RTU Open v5
Integration Guide
Supported?
Slave only
Not supported
Baud rates: Data Bits:
9600, 19200, 8
38400, 76800
Purpose:
Read Discrete Outputs
Read Discrete Inputs
Read Holding Registers
Read Input Registers
Write Discrete Outputs (single)
Write Holding Registers (single)
Write Discrete Outputs
Write Holding Registers
Range:
Single-Precision IEEE floating point
value
Parity: Stop Bits:
None 1
Used with Register
Numbers:
00001 - 65535
00001 - 65535
00001 - 65535
00001 - 65535
00001 - 65535
00001 - 65535
00001 - 65535
00001 - 65535
Function Codes Used with this
Register Type:
3 – Read Holding Register
6 – Preset Single Register
16 – Preset Multiple Register
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