Modbus Connection - Nortec EL005 Installation Manual

5.8.3.11 Modbus Connection

The Nortec EL steam humidifier comes standard with a Modbus communications interface, which can
be used to remotely control its output or monitor its operation.
Figure 36
Refer to
follows:
1. Connect a Modbus cable to the connector J6 on the Nortec EL control board. Refer to
Modbus cable requirements, and
resentative if assistance is needed to change the default communication parameters.
Note: The jumper JP7 on the control board must be installed to activate Modbus or BACnet MSTP
communication via RS485 interface (J6). If the jumper is not installed, no communication will take
place through J6.
2. Install the jumper JP4 on the control board if the Nortec EL steam humidifier is the first or last unit in
the network. Termination is generally not required if the network is less than 3280 ft (1000 m) in length.
SIM Card
Main Unit
Figure 36: Modbus Connection on Nortec EL steam humidifier
JP4 Jumper for activating the termination resistor for Modbus or BACnet MSTP network
J6 Modbus connector (RS485 interface)
JP7 Jumper for activating Modbus or BACnet MSTP communication via RS485 interface (J6)
Table 9: ModBus Cable Requirements
BMS Protocol
Modbus
* Connect humidifiers in a daisy chain to the Modbus RTU. Ground shield at on end only – either at the BMS or the humidifier.
Nortec EL
and connect the Modbus communication cable to the Nortec EL steam humidifier as
J2
J6
J10 J12 J14
GND GND GND GND 24V
J3
JP4 JP8 JP11
BAT
JP7
CR2032
J6
GND
JP4
Signal Type
EIA-485, 2-wire
2582302_C_EN_1611
Table 10 for communication parameters. Contact your Nortec rep-
TD RD GND 5V 3.3V
COMM PORT
J19
J22
J18
J17
LED
DISPLAY
DISPLAY
JP7
Recommended Cable
18-24 AWG shielded, twisted
pair, 120Ω *
Table 9
for
Maximum Distance from
Nortec humidifier to BMS
2200 ft (670 m)
Installation
53