Metasys N2 to Modbus RTU Gateway | |Metasys N2 to Modbus RTU Protocol Converter
  • This gateway can read Modbus data from your Metasys N2 devices and publish it as Modbus RTU data.
  • It can also write to the Metasys N2 devices.
  • This gateway can also do the reverse, read Modbus RTU data and publish it as Metasys N2 data.
  • It can also write to the Modbus RTU devices.

In summary, this gateway can act as:

Master on the Metasys N2 network: Hence it is capable of reading data from the various Modbus slave devices and writing data to them if required.

Slave on the Metasys N2 network: You can use the gateway in this mode if you have a Metasys N2 master on the network which would be reading data from the gateway.

Master on the Modbus RTU network: Hence it is capable of reading data from the various Modbus RTU devices and writing data to them if required.

Slave on the Modbus RTU network: The gateway can be configured to be a server of data values; hence another Modbus RTU client can read data from the gateway and write data into the gateway.

Block Diagram


 

Scenario 1

1)      On a site you have several Metasys N2 controllers that can provide data output on Metasys N2.

2)      The site has a SCADA on Modbus RTU that needs the data from the Ion meters on Metasys N2.

3)      Since the Metasys N2 controllers provide data output on Metasys N2 and the SCADA understands only Modbus RTU a direct data exchange is not possible.

Block Diagram:



 

Solution:

The devices can not directly communicate with each other as they are not on the same protocol. Metasys N2 is a Serial protocol, while Modbus RTU is an Ethernet based Protocol. You need something that will convert data from Modbus RTU device to Metasys N2 and vice versa.

ProtoConvert’s Metasys N2 to Modbus RTU converter will be an excellent solution for this requirement. The gateway reads data from the Energy meters on Metasys N2. It caches this data internally and then provides it on Modbus RTU when requested from the SCADA system.

Scenario 2

1)   On a site you have several power meters that can provide data output on Modbus RTU.

2) The site has  Metasys N2 controller that needs data from power meters on Modbus RTU.

3)  Since the Power Meters provide data output on Modbus RTU and the Metasys N2 controller understands only Metasys N2 a direct data exchange is not possible.

 Block Diagram


 

Solution

The devices can not directly communicate with each other as they are not on the same protocol. Metasys N2 is a Serial protocol, while Modbus RTU is an Ethernet based Protocol. You need something that will convert data from Modbus RTU device to Metasys N2 and vice versa.

ProtoConvert’s Modbus RTU to Metasys N2 converter will be an excellent solution for this requirement. The gateway reads data from the Power Meters on Modbus RTU. It caches this data internally and then provides it on Metasys N2 when requested from the Metasys controller.

 

An Overview of the two protocols

Metasys N2:

Metasys N2 was developed by Johnson Controls as a network to interface their various devices and controllers. It is on the physical layer RS-485 set of data communications standards and supports 9600 baud, 8 data bits, and no parity and in half-duplex mode only. This network supports communications with a huge range of devices manufactured by Johnson Controls and some other companies. Metasys N2 by Johnson Controls is a master/slave protocol with one master only so it is not possible to have two devices performing this function on the same network.

 

Modbus RTU:

ModbusRTU is a serial communication protocol that connects different devices on the same network and would make the communication between them possible.Modbus is transmitted over serial lines between devices. The cables used for the connection are either RS-485 or RS-232 cables. The simplest setup would be a single serial cable connecting the serial ports on two devices, a Master and a Slave.The data is sent as series of ones and zeroes called bits. Each bit is sent as a voltage. Zeroes are sent as positive voltages and ones as negative. The bits are sent very quickly. A typical transmission speed is 9600 baud (bits per second).