Modbus wireless

J

Thread Starter

Jaime

Hello

Which is the most cost effective way to go wireless with modbus rtu/ascci, and the design criterias involved (bluetooth, zigbee, wifi, rf?).

Thank you
Jaime Rebolledo
Electronic Engineer
 
The one technology you haven't mentioned: semaphore.

Seriously, what kind of answer can you expect throwing all those buzz word technologies on the table with absolutely no context?

Google will locate vendor or trade journal articles on this topic (with its usual drawbacks). As a forum, most respondents here do not do white papers for nebulous, wishful thinking requests.

Why don't you tell us what you're trying to accomplish, like how many points, the topography, the volume of data to be transferred, the throughput rates you expect. And include your budgetary restraints, which are clearly already known, given the prominence of 'cost effective' in your request.
 
L

Lynn August Linse

A key criteria for Modbus/RTU over wireless is the ability to hide the 'packet size' from the Modbus/RTU device. This either means:

1) buy a product with a base data payload of larger than 255 bytes.
2) buy a wireless product which is Modbus aware.

For example, Zigbee is limited to about 65-80 bytes. However, Zigbee-PRO include fragmentation support, so an intelligent 'master device' can send via Zigbee and have the Modbus/RTU (or ASCII) request reassembled at the remote end to avoid time-gaps.

In the end, they all probably can work - just find a suppler who understands what Modbus is and can commit to you that Modbus/RTU can be used with the product.
 
Thank you, that answer is exactly what I needed.

Jaime

> A key criteria for Modbus/RTU over wireless is the ability to hide the
> 'packet size' from the Modbus/RTUdevice.
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