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3.4 NETWORK CONFIGURATION
NETWORK CONFIGURATION
TYPE:
BAUD RATE:
ADDRESS:
ID:
MAX. MASTERS:
ENT - ACCEPT ESC - LEAVE UP/DN - CHANGE
D+
5
3/21 IOM-ELECTRA-FLO-INST
Nailor Industries Inc. reserves the right to change any information concerning product or specification without notice or obligation.
BACnet
38400
3
5
127
BACnet
D-
G
SH
6
7
8
J2
Network Configuration -
The Airflow G5 is provided with BACnet MS/TP and Modbus
RTU as serial communications protocol options. BACnet is the
default setting. The field configurable serial communications
interface is described on the following pages. Refer to section
2.3 for detailed information on terminal locations and wiring
connections.
Nailor recommends that 3-wire network cables with a separate
shield be used for communications. The interface can be
operated as a 2-wire network with no common, but this
configuration is more susceptible to noise.
Type – Select BACnet MS/TP or Modbus RTU. Modbus
network configuration information begins on page 21.
BACnet MS/TP
Select appropriate Baud Rate, Address, ID and Max Masters.
BACnet MS/TP serial interface connections are made at J2
terminals labeled D+, D-, G and SH.
The positive RS485 connection is made to D+, the negative
connection is made to D-. The 3-wire common connection is
made to G and the shield drain is connected to SH.
CAUTION
Do not connect shield drains to the "G" terminal.
Transceiver: 3-wire, half duplex (1/3 unit load)
Recommended maximum units per segment: 32
Baud rate(s): 9600, 19200, 38400, 57600, 115200 (default
38400) unless specified by end user
MS/TP MAC Address range: 1 – 255
BACnet device instance number range: 0 – 4,194,303
Max master: 1 – 127
End of line termination: Jumper selectable 120 Ohms or
none. Only use on end of line.
Biasing: Jumper selectable 549 Ohms or none. Only one
device on the network should provide biasing.
Flow control: none
The Custom ID menu page provides the Device object
description property over BACnet and on the display. This
property is writable over the network.
BACnet Object Types
BACnet Object Type and number of Objects implemented:
Device: 1
Analog Input - Reports the average temperature or average
flow. Also reports
Page 17
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