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ICC
11.11
Metasys N2
11.11.1
Metasys N2 Master
The gateway supports the Johnson Controls Metasys N2 master driver on both of
its RS-485 ports, and supports access to N2 analog input, analog output, binary
input, binary output, internal float, internal integer, and internal byte object types.
11.11.1.1
Overview
Some notes of interest are:
•
Requests are fully configurable through service objects.
•
Network characteristics are fixed at 9600 baud, 8 data bits, 1 start bit, 1 stop
bit and no parity according to the Metasys N2 specification.
•
Connect the N2 bus wiring to the RS-485 port by using twisted-pair cable
connected as shown in Figure 97. Connect the N2+ wire to terminal “A”, the
N2- wire to terminal “B”, and the network ground wire to terminal “GND”.
Also install jumper wires connecting terminal “A” to terminal “Y”, and terminal
“B” to terminal “Z”. Continue this connection scheme throughout the
remainder of the network. Always connect each unit in a daisy-chain
fashion, without drop lines, star configurations, etc. For further N2 network
wiring requirements and procedures, please refer to the appropriate JCI
network installation documentation.
Figure 97: N2 Bus Cable Connection to RS-485 Port
