Various people such as make equipment so that you can remotely actuate relays/read closures & temps; all via a web server & TCP/IP.
What I need is a pair of "computerless" boxes: Plus button A on master box; contact A closes on slave. Short contact C on slave, see closure on master. They talk to each other directly over TCP/IP.
Has anyone ever seen such?
Search for "serial ethernet" for numerous options that can provide an Ethernet bridge that looks like a serial link to the devices on either end. The Lantronix XPort has been out for a while and seems to have a pretty good reputation. Fairly easy to run with just a small microcontroller on either end to handle your relay and switch logic.
On the other hand, do you really need TCP/IP or can you get by with using UDP/IP? A compliant TCP stack is not trivial to write and get right but a roll-yer-own microcontroller with an interface chip running UDP and ARP is quite do-able.
Get you're self a PLC..
2 actually, they can talk to each other over the wire.Or, if you're feeling like building something that only needs a one time programming ...
This place has a good line for cheap single board computers.
David Lesher schrieb:
Hello,
look here
" In addition, the inputs can be configured to control the local relays when a voltage is applied or removed from them. The inputs can even be configured to perform this task peer-to-peer, providing remote relay control to any other ControlByWeb? relay on the network. This feature is perfect for switch extension, and remote event notification."
It seems possible that one webrelay-dual ist talking with another webrelay-dual directly over TCP/IP.
Bye
Yes, I did spot that later; and it's a good hit. Alas, their current boxes have too few "channels" but the designer is planning some wider ones..
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