Connecting Modbus to MetOne

You have two devices in two different buildings on two completely different networks, one that uses the Modbus ASCII protocol to communicate, while the other one talks MetOne Particle Counters protocol and they need to talk to each other. What do you do?

A FieldServer is a protocol converter or gateway that can communicate in many different protocols and physical layers including Modbus ASCII protocol and the MetOne Particle Counters protocol. The Fieldserver acts as a middle man between the two devices. It reads data from one device, stores it internally and makes it available to the 2nd device using another protocol. This is how the FieldServer converts Modbus ASCII data to MetOne Particle Counters data.

It's a simple solution to a common problem that we can help you with.

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Modbus ASCII

Modbus ASCII is part of the Modiconís Modbus family of protocols that operates on the serial network layer. With the help of a FieldServer client we can set and retrieve Modbus ASCII data from your device and make it available to other devices, or we can emulate a Modbus master and serve data to your Modbus device from other non Modbus devices. The FieldServer can convert Modbus ASCII message to an impressive set of other building automation protocols and acts as a middle man or protocol converter/gateway. More information, Driver Data Sheet

MetOne Particle Counters

The MetOne Particle Counter Serial driver allows the FieldServer to transfer data to and from devices over RS-232 or RS-485 using MetOne Particle Counter Serial protocol.

The primary purpose of the driver is to obtain the current particle counts, but it does allow for limited control and configuration of some counter parameters. While the driver provides Client and Server emulation, the Server side of the driver is intended to support FieldServerís Quality Assurance program and is not intended to provide complete emulation of a MetOne Counter. When configured as a Client the driver can start/stop a unit from sampling, change its mode, set and get sample and hold times, startup or standby a unit and retrieve its current sample value. Whenever the driver stores a sample value, it will also store a timestamp of when the record was obtained.

Supported devices

R4803 Remote Particle Counter

2100 Particle Counter with 2432 Manifold with 32 locations.

More information

Range of Conversion Solutions

Depending on project requirements select from units with varying resources. and multi port devices. OEM and embedded solutions too.
QuickServer 1010 2x RS485 1x Ethernet
QuickServer 1011 1x RS485 1x Ethernet 1x Lonworks
QuickServer 1020 1x RS485 1xRS232 1x Ethernet
QuickServer 1021 1x RS485 1xRS232 1x Ethernet 1x Lonworks
QuickServer Fieldbus 1x RS485 1x Ethernet M-bus or KNX
FS20 Series 1x RS232/485 1x Ethernet 1x Lonworks
FS25 Series 2x RS232/485 1x Ethernet
FS30 Series 2x RS232 and 2x RS485 2x Ethernet 1x Lonworks FieldBus Support:eg Profibus, DeviceNet etcHot Standby Support
FS40 Series 8x RS232 and 2x RS485 2x Ethernet 1x Lonworks FieldBus Support: eg DH+, MB+, Profibus, DeviceNet etcHot Standby Support
SlotServer 1x RS232/485 1x Ethernet 1x Lonworks For Rockwell ControlLogix 5600
Lonworks and Fieldbus are options not provided on base models.  

Connection Diagram

Modbus ASCII


MetOne Particle Counters

Purchase Now

You can purchase some of these items now at We keep stock of most gateways and CAS can often ship for next day delivery. Often we need to do due diligence with you, check the number of devices, trunks, points , network routing and many other factors and thus we like a chance to chat to you, learn your project requirements and work with you to provide the most effective solution. Contact us.

Configuration and Support

With CAS you are purchasing a solution - not a commodity. If you ask CAS to do the gateway configuration for you then you are purchasing a solution from us and we will work with you to pre-configure the device, make changes as you require them, keep a backup of your files and provide support for you and your customer when installation is done.

CAS are famous for a high level of effective and responsive support. We work with you using voice, email and remote desktop applications.

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Call us: 1-866-383-1657 (Toll Free) or (778) 370-3882
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