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DN-Series Integrated Programmable Controls
DOAS
120
SYSTEM MONITORING
13.7 MODBUS
The Modbus utilizes the standard registers and references them as an offset. For example, an
offset of Input Register 0 is Register 30,001 and an offset for Holding Register 0 is register
40,001. All values are shown in decimal format. The implementation also uses Coils and
Discrete Inputs in a similar manner.
13.7.1 Modbus TCP Connection
FIGURE 13.2.0 ETHERNET CONNECTION
Connection of Modbus TCP requires a physical cable
connection to the RJ45 jack on the controller. Prior to
making the wiring connections, the controller is to be
tested to verify proper control of the DOAS unit under
local control.
13.7.2 Modbus TCP Settings
First, set the IP address of the controller in the same
General Settings
area.
u
Set DHCP to Off if static
u
If Static, set the IP, mask, and gateway if required.
u
Set Update?
To Yes (Power will need to be cycled. This can be done after all of the
other settings.)
Then set the timeout parameter, if needed.
Last, set the BACnet port if different from the 47808 (BAC0). This screen allows you to set the
BACnet Device ID scrolling up or down.
