enervent Svea eAir - Installation to a Modbus Network

21Installation instructions for professionals
X26
The ventilation unit can be controlled by a Modbus
network. There are two alternative Modbus connection
methods available. By using the X26 Modbus RTU
connector on the Air motherboard, or by using the
Modbus TCP/IP (md-sw version 1.30 onwards) X19
connector. The connection method is selected in the
settings wizard in the eAir control panel, on the Modbus
tab (eAir control panel software version 2.07 onwards).
Modbus RTU default values
• Modbus address 1 (1–100)
• Communication form RS 485
• Speed 19,200 (9,600 or 115,200) bps
• Parity None (Even).
Modbus RTU X26 connection termination
RS485 X26 connector has optional termination and
biasing. These are selected in the short-circuit block JP5,
which is right behind the X26 connection.
The below table shows the JP5 jumper. The bottom row is
closest to the X26 RS485 connector.
In the picture below you can see the placements of the
Modbus RTU and Ethernet / Modbus TCP/IP connections
on the eAir motherboard.
Modbus registers can be found on the Enervent website at
www.enervent..
Installation to a Modbus network
The Modbus TCP/IP connection method does not
allow any kind of authentication or encryption. The
unit must not be connected to a network that has
open access to public internet. At the minimum,
there must be a rewall that prevents external
incoming network trac.
NOTE
[o o]
Biasing: Jumper installed = RS485 B line earthed
via the GND 600 Ω resistor.
[o o]
Termination: Jumper installed = bus terminated
[o o]
Biasing: Jumper installed = RS485 A line
connected via the +5V 600 Ω pull-up resistor
Modbus TCP/IP usage
• Modbus address is not used in Modbus TCP/IP. Access
to unit is by the unit IP address.
• Maximum two TCP/IP connections can be active at
the same time.
X1X2X3X4X5
X7
X12
X19
DO6DO5DO4DO3
DO1 DO2
X28X27
X26
JP5
JP2
eAir EMOKORTTI
Ha Mu Ru
TULO
X9
X10
DI11 GND A01
Ethernet
MODBUS-RTU
1234
X6
DO8DO7
AO8
A
B
GND
+12V
MODBUS-TCP/IP
Network control must not be connected to the
ventilation unit before the network master controller
is congured and compatible with unit control
parameters.
WARNING