Okay, so this is a repost of my question that got lost at the crash . I know at least one of you answered it, but it crashed before I could check it out (I received a mail though). So, how can I work with 2 energy sources? Like, a PC has it's independent source, and a modem has another source (with an adapter). The modem receives electrical signals from the PC, but those are from the PSU of the PC and not from the adapter of the modem, so if iirc the modem can't read those signals directly. How does the modem reads those signals then?
You've forgotten already? The ground wire sets up a common reference level, just like when you plug a battery-driven portable player into a mains amplifier.
Connect ground to ground. Its like taking a 9V battery, and connecting the postive end to ground. The other end will give you negative 9V. As long as the circuits are different, you can do this. For example, inside a PC, everything connected to the molex or motherboard all have the same lines connected to the mian ground. On the otherhand, if you take say 5 12V walwarts and plug them into the wall, then connect the 12V outputs in series (positive of the first to negative of the second and so-on) you will get a total of 60V across all of them. They are driven by transformers which isolate the actual ground point. This is why I dislike the water analogy when describing voltage.
So if I connect a ground from the PSU to the ground from the adapter, I should be able to work with both signals mixed together? Okay, thanks! But I don't understand why it does that? *relix goes googling*
You don't usually need to go that far. Hasn't the signal cable between the two got a ground wire or ground screen?
I'm gonna create the cables myself, not gonna use standard RS232 or something. There's gonna be a microcontroller inside the PC, running on the PSU of the PC. It'll send signals through a wire to an external application, also a microcontroller, but that one will be running on something else, probably an adapter.
What _you_ upto, ChriX?(mine was gonna use a realtek 8019AS but I found something better... ) Hazer: okay, so I just connect the ground of the PSU to the ground of the adapter, right?
Mmmm...should I? ... oh well, why not, as long as you don't steal my idea (which I won't tell you btw ): http://www.iinchip.com/e_iinchip/product_module_iim7010A.htm It's practically the same as the 8019AS (the chip it has (W3100A) is based on the 8020AS), but it supports 100mbits and it has a hardware TCP/IP stack, which means I won't have to fiddle around with creating packets and all that, I just need to "open connection" to some IP, send some data, read some data and close connection. Just as you would program sockets in windows. The only limitation is that you can only have 4 simultaneous sockets open at once, but my project doesn't need more anyway.
Did you get just the chip on its own or the evaluation boards or something? Main reason I went with that 8019AS is because it's already soldered to a PCB that I can connect to easily. I don't have the facilities for SMDs.
The module shown on that page (sorry, it's framed based, I copied the wrong URL, so for my previous post, this is what I was talking about: http://www.iinchip.com/e_iinchip/product_module_iim7010A.htm ) (IIM7010) can be bought from here: http://www.mcselec.com/pricelis.htm It isn't mentioned in the list, but I mailed them about it and they can sell the IIM7010 for 25,95 euro. The IIM7010 has the ethernet-jack, the IIM7000 doesn't. Oh, and while I'm giving away my intel anyway, here you can buy the 8019AS on a module (so you don't have to solder): http://www.edtp.com/ It also has boards with a connector for PIC's or AVR's and all that stuff. Has lots of good stuff. Here's a VERY good page about embedded ethernet: http://www.beyondlogic.org/etherip/ip.htm So, what are you gonna make?
Cheers relix ol' matey ol' pal. Here's a nice load of info i've found too: http://www.eix.co.uk/Ethernet/WWarticle.htm
Ive been looking for that sort of thing for a while to do ethernet lcds so much better than serial or parallel or even usb. youve just saved me a lot of hassle thanks
