RS-485 Modbus RTU to Wirelesshart

[moltra]

Does anyone know of a converter or adapter that will take a device with a RS-485 output and allow it to broad over WirelessHart. I am also looking for a way to convert IO-Link to wirelessHart or another secure wireless industrial network.

Thanks in advance.

 

[danw2]

An RS-485-wirelessHART module is unlikely. 485 is a hardware bus designation/standard, not a protocol, whereas HART is a protocol (master/slave query/response with known limits on the size of the data respones) whose hardware layer was converted from FSK-over-copper to wireless.

485 data could be continuous streaming from a device (printer, mouse, analyzer), Modbus RTU, Profibus DP, or any of a thousand proprietary protocols.

Were such a module to come to fore, it would have to be protocol specific for Wireless HART gateway to deal with it. The cost of joining the WirelessHART party is likely to be quite high, making the likelihood of such quite low, especially when there is a multitude of powered RS-485 wireless modems on the market already, many with much better performance specs than wireless HART, some of which are designed to handle the timing requirements of Modbus RTU, others just generic 485.

ISA100 (Wireless HART's competitor) has a tunneling channel that conceiveably could handle 485 data were a vendor willing to pay the license and development fees.

 

[scenes]

Hey,

Sorry but it's not possible.

You will need to use standard wireless communication with a proprietary protocol; you have a bunch of solutions like that on the market. These options will also have a mesh network, but the protocol is proprietary most of the time, but it can read and transfer the Modbus or wherever the information wirelessly.

Second off, instead of applying a wirelessHART network, you can decide to go ISA 100. The ISA 100 supports Modbus communication, and you have converters from Yokogawa that can do it. On the downside, you won't have many options to expand your network because most of the vendors are using WirelessHART rather than ISA 100.

Thanks