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Hitachi Dr ZX
- Thread starter bnobles
- Start date
JDirt
Well-Known Member
I also have the dr zx from eBay. The disc for xp laptop and the usb to machine cord. Never could get it to work, always a communication problem.
Would my cord work with a different program? Where do I get a program that works?
Would my cord work with a different program? Where do I get a program that works?
I think is a problem is a cabel. One interesing information I find on russian forum that the ic in the cable is important. The men tested there few diffrent cabels with CH340G, pl2303, pl2303hx and cp2102. And on the cable with CP2102 everthings was work fine. I have inside in my cord CH340G. Maybe you can open your and share a photo from inside for compare with my?
JDirt
Well-Known Member
My cable is also a ch340g. I wonder how you find the cp2102?
Is ttl adapter plus something more. This more is U2 on pcb can you read this what is on ic?
JDirt
Well-Known Member
Inside my cord, the chip reads: WCH CH340G, and under that 202685403. Almost had to have a microscope to see that part. So you're saying that if I change this out for the cp2102 thing, then my dr. zx will work?
If information what I find in russian forum are true then will be work. But I still don't know is this usb to ttl or usb rs232 or maybe to 485. Am on the way to find out now know u2 and gone check what is this. Also I ordered basic cord with cp2102. I gone try make right cabel. I let know soon as is possible...
Can you read this element mark on photo?
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Ronsii
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If I had to guess without seeing a complete picture of the board (both sides) I would say U2 is a VREG chip.. just because of the components near it, the cp2102 is a pretty generic usb to uart converter chip, tons of things use this and similar chips... the 2102 just has more support in the windows platform because of it's widespread use... however there are also tons of iterations of this chip with everybody and their chinese brother making a copy of it and some changing it just a wee bit... this is why sometimes an identical(looking) piece of hardware will not work like it's twin.
Hi later I will make complete photo of pcb. Maybe you help me. But this what I see the u2 is cross communication line from ch340g?is strange for voltage regulator?
Ronsii
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I have a usb dr-zx laying around here somewhere... tomorrow I will pull it apart and see just what going on inside it, there's no better way to start a day than reverse engineering simple hardware 
Ps. the 340 chip came out as a better/cheaper chip in the usb to uart series right after the first FTDI scandal but might still be lacking in the drivers department when it comes to windows usability.. not sure as I haven't had the need to research it lately.
Ps. the 340 chip came out as a better/cheaper chip in the usb to uart series right after the first FTDI scandal but might still be lacking in the drivers department when it comes to windows usability.. not sure as I haven't had the need to research it lately.
Ok thanks men. If you can look in your cabel and say what is there will be fine. I will wait for your replay. My cabel is real china clone with only cloned the names on ic'sI have a usb dr-zx laying around here somewhere... tomorrow I will pull it apart and see just what going on inside it, there's no better way to start a day than reverse engineering simple hardware
Ps. the 340 chip came out as a better/cheaper chip in the usb to uart series right after the first FTDI scandal but might still be lacking in the drivers department when it comes to windows usability.. not sure as I haven't had the need to research it lately.
JDirt
Well-Known Member
That part on mine is labeled CO45.
This is chinees dual inverter SN74LVC2G04DBVR .Now we gone wait for Ronsii. He gone check what is inside his working cabel. Then maybe we find a problem
Ronsii
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Yes szpryczek, the dr-ex I found here is similar to yours with the 340G uart chip and yes the 6 pin chip is a dual inverter/level chip : #1 d0,#2GND,#3D1,#4D2,#5VCC,#6D3
Have you tried to switch #1-3 on the four pin DR-EX connector to the machine? the reason I mention this is I have seen many clone type electronics get the tx/rx switched....
Have you tried to switch #1-3 on the four pin DR-EX connector to the machine? the reason I mention this is I have seen many clone type electronics get the tx/rx switched....
Is your clone works? I switched the tx with rx but not positive results. What is a label on your U2? Maybe the inverter is different? And what is your resistor on rx and rx? My is 100ohm.
Ronsii
Senior Member
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As far as I know this one worked but has been some time since I used any of them, I seem to remember it would only work with one older laptop and the drivers took a bit to get loaded correctly. If I get extra time will see if I can hook up to our 120, I think the resistors on the x lines are .1k... been a while since I did anything whit it