Connecting Modbus to Metasys

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 Metasys N2 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 Metasys N2 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 Metasys N2 data.

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

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

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

Metasys N2

Metasys N2 is part of Johnson Controls family of protocols. Metasys N2 is a diverse protocol used by many different devices all with there own quirks and definition of the standard, it can be complicated to get Metasys N2 to talk to other devices. Fieldserver takes care of the complicated issues with Metasys N2 by becoming a middle man that sits between your Metasys N2 device and your other devices. The FieldServer can talk Metasys N2 on one side and anything else you want on the other.


Large number of N2 devices ?

Transitioning an existing N2 installation to BACnet ?

For conversions with a large number of N2 devices or for solutions where you need to keep The Metasys by JCI head ends/controllers in place please visit these pages for an appropriate solution. The S4 solution connects to the trunk(s), discovers all the devices and auto maps them to BACnet IP. The original controller can be kept in place and will continue to communicate through the gateway with its N2 devices. You can remove it later or never - your choice.

Read more about the S4 Gateway



More information, Driver Data Sheet

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


Metasys N2

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.

Contact us

We have the solution that you are looking for, please contact us today.

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