Hi,
We have built devices that run on batteries and serve a specific task. For the future we also want to offer a wired solution, for better user experience and more features, that would drain the batteries faster. Since the wired solution already requieres hardware wiring, a remote readout of statistics of each node device, would be a very nice option.
A 4-wire solution (2 PWR / 2 Bus) would result in complex installation because alot of clamp terminals or even specific cable (twist pair) would be needed. A 2-wire (power) solution would offer ease of installation, because the power wires just can be connected with "cut-in" connectors
The physical layout of a node group (master with nodes) would be the following:
- Around 30 nodes per master
- maximum of 40m main cable (80m if connected in ring)
- nodes connect to main cable by stubs, maximum 2 meters in lenght
- Nodes need 3.3V@5mA mostly. In some cases the current goes up to 100mA (NFC)
- Supply prefferably 24V DC, can be anything 12-36 beacuse power supply is not designed yet
- Data Transmission per Node : 32byte burst, once each 2hrs, or even less
- Bidirectional communication only optional. Needed is only one way (node->master)
- Bus protocol preffered can bus, but can by any (STM32 is the node processor)
I spotted a few powerline modems from ST, but im unsure which of the devices would work fo our application.
Can someone recommend a device?
