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ACH550 E-Clipse Bypass User’s Manual 2-109

Embedded fieldbus

N2 protocol technical data – system

System overview

The N2 Fieldbus connection to the system is based on an industry standard RS-485

physical interface. The N2 Fieldbus protocol is a master-slave type, serial

communication protocol, used by the Johnson Controls Metasys® system. In the

Metasys architecture the N2 Fieldbus connects object interfaces and remote

controllers to Network Control Units (NCUs).

The N2 Fieldbus can also be used to connect the system to the Metasys Companion

product line.

This section describes the use of the N2 Fieldbus with the E-Clipse Bypass

connection.

Supported features

In the N2 Fieldbus protocol the ACH550 and E-Clipse Bypass may appear as a

“virtual object”.

A virtual object is made up of:

• Analog Inputs

• Binary Inputs

• Analog Outputs

• Binary Outputs

• Internal values for Floating point, Integer, and Byte values.

ACH550

Analog Inputs

Binary Inputs

Internal values, Float, Integer, Byte

Analog Outputs

Binary Outputs

Virtual Object

Metasys

Note: Metasys inputs are drive outputs and

drive inputs are Metasys outputs

E-Clipse Bypass