Westermo Data Communications has released a range of products that offer an easy way to extend the distance between 78 kbit/s LonWorks TP/FT-10 (twisted pair free topology) network segments using high speed 1,250 kbit/s backbone fibre optic network links. The LRW-102 is a LonWorks modem that acts as a repeater between two fibre optic links and as a converter between LonWorks networks and a fibre optic link. The LRW-102 is transparent and acts as a TP/FT-10 physical layer repeater to extend distances by up to 120km and protect the network against electrical interference. The LRW-102 is designed for multi-drop and redundant ring applications, with a separate model (LRW-102PP) available for simple point-to-point connections.
Westermo has also released the LRW-112 fibre optic router which offers similar functionality to the LRW-102, but also enables two LonWorks networks to be connected over long distances. The LRW-112 can be installed as a repeater, configured router, or learning router and is designed for multi-drop and redundant ring applications. The LRW-112PP model is available for point-to-point connections. Equipped with a standard router core module, the new devices allow standard configuration and installation using LonMaker® and other LNS-based tools.
The LRW range is designed for harsh industrial usage as well as road or railway installations meeting industrial level EMC specifications and having a wide operating temperature range between –40 to 60°C (-40 to 70°C for the point-to-point versions). Total galvanic isolation and transient protection are standard for all interfaces. The line interfaces are also equipped with extensive protection against over-currents and voltage suppression.
The units also have a re-timing function that eliminates the problem of jitter and hence ensures reliable communications in all situations. To allow for uninterrupted communication the units are designed with redundant power inputs that can be powered from two separate supplies and handle an operating voltage range of 10 – 60 VDC.
All the devices are easy to configure using DIP-switches and the case is suitable for DIN rail mounting.