Appendix D: Johnson N2 Protocol Implementation Conformance Statement - Carrier RTU Open v5 Integration Manual

Appendix D: Johnson N2 Protocol Implementation Conformance Statement

Appendix D: Johnson N2 Protocol Implementation Conformance
Statement
Vendor Name: Carrier
Product Names: RTU Open
Product Model Number: RTU Open
Protocol Description:
N2 is not a standard protocol, but one that was created by Johnson Controls, Inc. that has been made open and
available to the public. The speed of N2 network is limited to only 9600 baud. The N2 slave address can be set
from 01 to 99.
Product Description:
The RTU Open is a factory-installed rooftop controller that is capable of speaking multiple protocols. The RTU Open
controller speaks the Johnson N2 Open Protocol as described in the Metasys N2 System Protocol Specification
(for Vendors) document, revision 6/13/96. Further details on the N2 supported implementation are described
below.
Communication Types:
2-wire EIA-485
Network Point Types:
Analog Inputs (AI)
Binary Inputs (BI)
Analog Outputs (AO)
Binary Outputs (BO)
Internal Floats (ADF)
Internal Integers (ADI)
Internal Bytes (BD)
Protocol Commands:
Identify Device Type
Sync Time
Poll Without Acknowledge
Poll With Acknowledge
Read Analog Input
Read Binary Input
Read Analog Output
Read Binary Output
Read Internal Parameter
Write Analog Input
Write Binary Input
Write Analog Output
RTU Open v5
Integration Guide
Baud
Data Bits:
rates:
9600 8
58
Parity: Stop Bits:
None 1
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