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7.6
Connecting a RS485 Network
Multiple Dumo dust monitors can be connected into a single network. This 'daisy chain' connection allows for
several devices to be communicated with using only minimal wiring. Both Modbus RTU and Sintrol Network
protocols are supported.
To use Modbus RTU protocol the RS485 bus needs to be connected to the CH-1 RS485 terminals according to
the following schematics. Use suitable 3-wire or above shielded cabling, minimum 0,3 mm
make sure to ground the shield at a single location.
Make sure that the RS485 bus terminator resistor switch is enabled only on the last device in the bus.
Using DustTool, confirm on the properties-page that the RS485 protocol is set appropriately:
To use the device with a Modbus RTU master, choose the Modbus Slave option and assign an
appropriate slave ID.
To use the device with DustLog and a router device, choose the Sintrol Slave option. (This is the
default setting)
Figure 15: Connecting a RS485 Network
or AWG 22 and
2
RS485
Terminator
switch ON
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