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Nodal Controllers©

Many systems operate on an RS485 bus in multi-drop mode or are simply linked with a point to point RS422 or RS232 connection.

Problems arise in system design when two or more pieces of equipment require to share data.  Things are made even worse when the items that need to share data are themselves operating in "Slave" mode, requiring to be polled before they are able to respond with data.

The problem is neatly side-stepped by using Nodal Controllers© so called as they act as an information hub or node for any system in which they are introduced.  In the figure below the simplest implementation of such a device is outlined.  Here the controller is configured to operate as an intelligent protocol converter.

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Specifically in the above example, the JCS JT229 Nodal Controller © operates by running a pre-determined data fetch from both pieces of attached equipment.  This is immediately followed by a pre-determined data send to each equipment effectively mapping information from one product into the other and visa-versa.

This technique allows all common data area's to be mapped in all required equipments. 

This data sharing approach may be extended to support as many networks of equipment as there are serial ports on the Nodal Controller © .  The maximum number of ports that are supported by the JT229 at this time is 8.

Nodal Controller©  1999 (Jotax Ltd)