TECO F510 series - Definition of Metasys N2 Communication Protocol

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4.8.3 Definition of MetaSys N2 Communication Protocol
MetaSys N2 is the communication protocol developed by Johnson Control Company. MetaSys N2
communication protocol uses the configuration of Master/ Slave. Every N2 Slave device can set N2
address and the range is 1-255.
The data of N2 Slave is displayed by the object and Network Point Type (NPT) is classified to seven
kinds of objects:
No. NPT Name
NPT
(abbreviation)
Description
1 Analog input AI 32-bit, IEEE- Standard floating-point
2 Binary input BI 1-bit
3 Analog output AO 32-bit, IEEE- Standard floating-point
4 Binary output BO 1-bit
5
Internal
floating-point
ADF 32-bit, IEEE- Standard floating-point
6 Internal integer ADI 16-bit
7 Internal Bytes DB 8-bit
The input and output are mainly for N2 network. The input is the data from N2 Slave to N2 network
and the output is the data from N2 network to N2 Slave.
Virtual Object
A
nalog Outputs
Binary Outputs
Analog Inputs
Binary Inputs
ByteFloat
Integer
The object of N2 Slave has grouping and every group data can set the address of 0-255,
abbreviated for NPA (Network Point Address).
Every object has its property which includes data contens (AI and AO object), object status (BI and
BI object data), planning approach (if COS can respond or not) and so on. The property can read or
write command but the data value of analog output and digital output requires the Override
command to write in.
The object of N2 support function of COS (output in the change of status) and if COS starts, object
of AO, BI, and BO will automatically record under the data change and respond under the poll.
N2 Slave device waits for the indentify command after the inverter starts and starts for the
communication with network after receiving the indentify command.