Metasys N2; Metasys N2 Master - ICC XLTR-1000 Instruction Manual

ICC

9.8 Metasys N2

9.8.1 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.
9.8.1.1 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 selected RS-485 port by using twisted-pair
cable connected as shown in Figure 15 ("RS-485 B" port example shown).
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 15: N2 Bus Cable Connection to "RS-485 B" Port
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