I’ve been looking at a simple way I can “play” and “monitor” several gadgets on my router/printer/etc room through any pc on the house. I looked at using wireless modules of different frequencies/technologies (ISM/433MHz, Zigbee, …); all would require specific hardware at each of the PCs … not quite what I had in mind. Around came two things which seemed to be “better”: The Wifly module from Roving Networks (e.g. Wifi Garage Door Opener) and the WIZ110SR module Wiznet. The Wifly module looked pretty cool, and the garage door application example I looked through was nothing short of cool. However although I am quite capable with hardware, I am not quite savvy with Ethernet stuff (you know protocols, etc). So when I looked at the WIZ110SR and saw that I could do simple RS232-to-Ethernet (telnet) communication with it I figure I could possibly start with that.
So I order one along with a +5VDC wall-wart. Here’s how it went…
Remember I mentioned I’m no expert at Ethernet stuff - I can speak SPI, CAN, I2C… but for Ethernet all I know is to plug it and play. So that’s exactly what I did (the manual is not too great on this respect). You connect the module to the PC (straight) no router or anything else … and of course nothing works. It shouldn’t, not unless you setup the PC’s port to the same subnet and all that cool stuff. This much I expected; but I would have also expected the manual to detail what the default configuration of the module is (I can’t say I found it). So I proceeded to connect the module to the router (to allow it to assign an IP address to the module) … I’m sure if I knew what I was doing it would’ve worked; but I was not getting there fast enough. No matter what the Wiznet’s Configuratio Utility would not “discover” the module.
So I scoured the web for examples, faqs, etc … and I found out that the serial port, even though would not allow configuration until enabled with the config utility, would report the initial/default state. Of course I wasn’t sure what the serial port was configured (again, the manual doesn’t quite state that). So I looked at a few pictures and all seemed to say 57600-8-N-1 … yesss that’s what I was looking for. Also the connection SW1 will re-start the module. Connect the serial port to the PC, set for 57600-8-N-1 and default configuration is at your fingertips once the module powers-up.
Next, use this information to configure the PC’s Ethernet port. Connect the module to the PC through Ethernet and use the configuration utility to search for the module … using the “Direct IP Search”.
Now you can change the RS232 configuration if desired…
And better yet, enable configuration through the RS232 port…
This is probably the simplest stuff you can do with this. But now know how to configure it and communicate between RS232 and Ethernet (through Telnet).
Not sure yet where this will go, but given some time I’m sure it can be put to good use.
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Wiznet’s WIZ110SR – Initial Impression
Blog entry posted in 'Electronics and Other Ramblings...', Mar 3, 2012.