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Modbus communication with Hach Particle Counters



I'm trying to communicate with a couple different Hatch Particle Counters.  A model 3413 and a model 3411. 


The units have an Ethernet port and I have been given a modbus register map, but unfortunately little other information.


Using the modbus library example, I was able to open a TCP port to the unit.  Reading any registers or coils always resulted in a timeout.


I received some supplementary information about a 3rd party OPC server that listed modbus communication with this Particle Counter model as only through the USB port.


The on-board configuration of the unit shows the modbus port on the Ethernet configuration screen, so I only assumed modbus was possible through Ethernet.


I was curious if anyone had successfully communicated with one of these or a similar unit.

Patrick Allen:
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