SDC2130 TTL Serial Communication

7 years 2 months ago - 7 years 2 months ago #29529519 by ldavisfl
I had not tried RealTerm with RS232. So, I went ahead and tried that. I get the same results as you did. I think that this is not surprising since Roborun works fine over RS232.

Let me know how TTL goes.

Meanwhile I am going to get a USB-TTL cable that is new, just to try something different.


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7 years 2 months ago #29529520 by Griffin Baker
Replied by Griffin Baker on topic SDC2130 TTL Serial Communication
I will have to get a converter for this as I don't have anything on hand that can process the TTL. Here is what I plan to use.

www.sparkfun.com/products/449

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7 years 2 months ago #29529523 by ldavisfl
I can confirm my baud settings + 8N1 all match you.

Any idea why the FID comes in crystal clear and perfect and yet nothing else does? Isn't the FID also "data?" Could it be that the FID is transmitted and then the pins go silent? My theory is that the FID is the ONLY thing being sent, and the rest is just the result of a bad noise problem. TTL serial is commonly plagued with noise issues because the voltage level (0-3.3V or 0-5V) is so low.

I am unable to catch the FID being sent on my scope but will continue to try. I am also going to work on cleaning up the noise with pull down resistors and shortening wires.

Can you confirm that the Roborun Motor Control Software doesn't work over TTL? I couldn't get it to work so I am assuming it only works over RS232 and USB. With TTL we are limited to console style commands, right?

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7 years 2 months ago #29529525 by ldavisfl
By the way, here is the RS232-TTL adapter that I have. It is from moderndevice.com and you have to assemble it yourself, which takes about 5 mins. If anyone needs another RS232-TTL option maybe this could work for them.

moderndevice.com/product/p4-rs232-to-ttl-serial-adapter-kit/

What I like about this kit is that there are three output rows. Row 1 is the actual output. Row 2 & 3 are tied together. You can stick wires in Row 1 directly. Or, you can use jumpers from Row 1 to 2 to rearrange the pins if you need to. If this is the case, row 3 would be for your project wires or for an included header connector.

According to my measurements, this board draws about 10-13 mA when supplied with 5V.

The one you are getting looks fine. I like that it is very small.

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