The logic levels for the ccTalk line are 3.5 to 5V for mark state (idle ) and 0 to 1V for space state (active). This allows a low cost interface width 5V microcontrollers. Some dedicated gaming PC based platforms like have one or more built in ccTalk ports. Simple 5V microcontroller interface A normal switching diode can be used but the noise margin could be to low. The resistor can be in 1Kohm to 10Kohm range. If the Tx output is open colector you can connect together TX RX and data line without the diode.

This is a Visual Basic ccTalk host that handles a bill acceptor and a. CcTalk cable, Custom messages are. 4.1 24-05-01 Modification to recommended cctalk interface circuit ‘Circuit 1 - cctalk Standard Interface’ 4.2 05-10-01 Addition of connector type 9 for serial universal hopper.

Also the resistor is not required if the slave has a pull up. Simple 3V microcontroller interface You can skip the diode if the microcontroller has internal protection diode.

I know that the levels are not exactly by the book, the input low level for Pic microcontrollers is guaranteed at 0.15 VDD for CMOS inputs. 1V means 0.3VDD for 3.3 V and 0.2VDD for 5V but this worked for me flawlessly For PC there are many USB to RS232 TTL adapters available that can be used with the schematics above, search Google, they have 5V and 3.3V outputs. If you want a ready made ccTalk cable has one (pl2303 based) or you can find some more in “Usefull ccTalk links” page. There is also on youtube a video where is simply connecting TX and RX and data together, I doubt that the TX output is open collector the slave just force zero the output that acts also as a pull up when idle. This might reset your USB to serial chip if the output is stronger. Of course do not forget the official schematics from the ccTalk documentation, I don’t have their agreement to show them here but you can find them in page 82 to 85. (Continues from last post) Looking completely to my questions in my last post and the “this guy” video in Youtube, what I understand is that: Attaching the only 1 data line of ccTalk device to a USB to TTL cable’s DATA IN (receieved) and DATA OUT (transmittted) cables is enough.

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But there appear two new questions: 1-The equipment in the video is a ccTalk coin acceptor which needs12 V to work. So the guy takes the energy from the PC’s board.

But for a hopper which needs 24 V, 1 A minimum, it is impossible. OK, the answer my friend is blowing in the wind, it is easy, just use an external 24 V power supply. But the guy atttaches the USB-TTL cable’s ground (black) to the PC board’s ground (black) cable. In that case should I attach the USB-TTL cable’s ground to the 24V external power supply’s ground? 2-It seems it is possible to work by connecting the only 1 data line of ccTalk equipment to a desktop PC’s 9 pin RS232 pins [(both) 2nd (tranmission) and 3rd (receiver)] and using an external 24 V power supply WITHOUT A USB TO TTL CABLE.

(In that case there is no ‘where to connect the ground of USBtoTTL cable’ question, there is no USB cable or port in this scenerio) Like. I’m having trouble communicating with a Microcoin SP1. I used to use a PL2303HX USB to RS232 TTL converter very successfully (by using the simple connect TX and RX together approach), but this converter does not support windows 8 and above and I’ve been forced to upgrade to windows 10. Instead I’ve purchased the PL2303TA which does support windows 10 and to use this I’ve used your ‘Simple 5V microcontroller interface’. This works really well for transmitting, but I could not get a reply (strictly I got a garbled reply).

Connecting up an oscilloscope, I found that in the the reply from the coin acceptor, the level is only being pulled down to 2v, not 0v. My electronics knowledge is very rusty (ie I’ve not done any for 25 years!), but I was kind of thinking that I need some sort of circuit to bring down the level at the coin acceptor end. Any suggestions at all?

Many thanks in advance, Richard Like. I see that PL232TA is using 3V not 5. I had this issue when I burned the USB to serial TTL converter but this happened only when I did something very wrong, I forgot a ground wire or I had a short to 12 V on the data line. Are you having loopback answer without connecting the coin acceptor? If not then change the converter.

The issue with using 3v converter was mostly for the TX side because the “1” level might be to low for some devices, most of them are having a similar input inside and translate levels over 2.5V as “1”. The chance to burn the RX due the 5v pull-up is very low, never happened to me. Nothing on google worked for PL2303HX? I switched to windows 10 recently and I found drivers for all my cables even no name ones( not official ones but working well) Like. Use the transistor schematic. I really don’t see where is the trouble with the mirrored message on RX.