Abbreviations And Definitions; Network Connection; Hardware Set-Up - Danfoss VLT HVAC Drive Metasys N2 Manual

®
VLT HVAC Drive Metasys N2

2.1.1. Abbreviations and Definitions

Abbreviations and definitions
ACK
ADF
ADI
AI
AO
BI
BO
COS
HPFB
JCI
N2
N2 master
NAK
NPA
NPT
PAR

2.1.2. Network Connection

Connect signal wires to terminal 68 (N+) and terminal 69 (N-) on main control board of the drive.
If shielded cabling is used, connect one end of the shield to terminal 61. This terminal is connected
to ground via an internal RC link. It is highly recommended to use twisted-pair cables to reduce
the differential mode interference between the conductors
Torque Specifications:
Control wire:

2.1.3. Hardware Set-up

RS 485 Bus Connection:
One or more frequency converters can be connected to a control (or master) using the RS485
standardized interface. Terminal 68 is connected to the P signal (TX+, RX+), while terminal 69 is
connected to the N signal (TX-,RX-). If more than one frequency converter is connected to a
master, use parallel connections.
Acknowledge
Internal Floating Points
Internal Integers
Analog Inputs
Analog Outputs
Binary Inputs
Binary Outputs
Change Of State
High Performance Field Bus
Johnson Controls Inc. developers of the METASYS N2 protocol
METASYS N2
A N2 master is either a PC with JCI software or a dedicated JCI controller
Not acknowledged
N2 Point Address (Each N2 Point Type has a address range from 0 to 255)
N2 Point Type
Parameter Number
4.5 in.lb. (0.5 Nm)
18 - 24 AWG, shielded, twisted pair
MG.11.G1.02 - VLT ® is a registered Danfoss trademark
2. Instructions
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