Jaux wrote:
It has an embedded 1A switching supply which can take 9 - 20 VAC input in a "power-over-RS-485" configuration.
I would be interested to find out a little more about the details of your "power over RS485" concept. Thanks in advance.
Regards,
Mac
Message Edited by bigmac on 2007-01-1611:02 AM
Mac,
Just round the corner from me ( Cape Town, South Africa) - nice see somebody from down South.
I have tried to contrust an arrangement using the data pairs for conveying the AC, but the problem is that in oder to get any reasonable distance on RS-485 one has to watch the baud-rate and even using 115 kB, the seperation from 50 Hz is tricky, and the isolation transformer is bulky, expensive and does not work very well. So the 4-core screened cable is pretty standard what we use for normal RS-232 comms. Also, the 4-Cs cable is cheaper than CAT-5 cable.
I am using a LM2575T (~ USD1.2 ea )( switching regulator soldered directly to a copper-pour area on the PCB. See attached pic. I agree it is a little expensive, but this arrangement take away all headaches of a typlical noisy industrial deployment. Using this arrangement will eliminate your earth-loop problems.
I love the AW60 and AW32 chip - We have standardized on this for all our 8-bit applications. Try asking Freescale for samples if you need one or two for prototyping, or you can buy small quantities directly from Freescale ( shipping however is expensive )
Hi Rob
since i hate the usual demo boards i have developed the HC(S)08 system. The idea is to have a "mainboard" and different modules for your MPU as well as a lot of "addons" to get started with your prototype. I wanted to include a simple OS witch has become my EBS08 as a base for the software (i am using Motorola/freescale MPU for about 20 years now) having a lot of modules beside. Then for every hardware module i have also the schematics as a module, so once i have finished the software and having tested it i do the layout based on my modules. All this save a lot of time and is kind of foolproof! (at least i do the mistakes normally only once!).
For more infos visit www.systech-gmbh.ch -> HC(S)08 system for the hardware and -> EBS08 for the software. If you need help ask here or send a mail to info@systech-gmbh.ch
Saluti Joerg
Hi Irob. I think that you hardly will actually find a better demo board than DEMO9S08AW60 for the same price for the 9S08 family.
It has a lot of I/O on board and many leds and pushbuttons to experiment with other than 2 RS232 and USB BDM. Not to talk of the expensive 64 pin QFP socket which would cost you more than the whole board if bought as a spare part and which is invaluable to permit to replace a possibly blown cpu (unfortunately I found the AW60 quite delicate on the ESD side).
Yes, the accelerometer is completely unusefull but the potentiometer and the light sensor may be good. I have at least 6 or 7 HC08xx demo board but I abandoned all them for DEMO9S08AW60 which permits you to work either on 3 or 5V supply environment and, most af all has BDM interface.
Regards,
Encoder