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jack
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| Hi Sergio, I just downloaded the file and no problem occured. Please try again and if you still have problems please write with more detailed description. Regards. |
| Thanks Jack, I have tried again and file has downloaded fine now. Best Regards. Sergio. |
| Congratulations Sirs. It is a very goog and useful project. Regards. Sergio |
| Hello Sirs. I am here again. I have assembled this circuit and have a problem. When I try to send data, pin 3 of MAX485 (I have used SN76175) stay in low state (0.28 volt) and MAX485 don´t work. I hope that you have any solution. Thanks and Best Regards. Sergio |
| Hi, are you sure that SN76175 is the equivalent of MAX485? I couldn't find any datasheets for SN76175. |
| Sorry I have done a mistake. I beg your pardon. I have used SN75176 , not SN76175. Thanks again. Sergio |
| Hi Sergio, I just checked the assembled circuit. When there is no transmit, the pin 3 keeps its high state (6.5V), when I transmit data it goes to low (2.3V). So it works properly. SN75176 can be used instead of MAX485 as you know. But are there any other difference in your circuit? |
| The only diference I have is SN75176 and my LM7805 give me 5v like the most high tension. How do you have 6.5 volt. The BC327 never change his state and pin 3 from SN75176 is ever low (0.28v). Pin 12 from MAX232 keep always BC327 in the same state. I don´t know where is the problem. Thanks for your answer. |
| I have seen the tx led blinking. But nothing in the out of SN75176 Thanks Jack. |
| Wait a minute please. I forget to wire TR emisor to Vcc. |
| 6.5V is the result of an input signal with a magnitude greater than 5V. It was only to show the toggle between the high and the low states. I am waiting the result after connecting the emitor :) I hope it will be ok this time. |
| Well. It seems to be working now, may be fine. I have not experience about this. I think that have a weak signal level in the out of SN75176. I have teste (pin 6-7) with a led and serial resistence (500 ohm) and blink. In pin 3 I have 0.28v with no data and fluctuates between 0.34v - 0.56v with data trasmition. I just have a digital multimeter. 8-)) I beg your pardon again. Best Regards. Sergio. |
| Hello Sirs. I am working in a develop to connect the computer with my car. I have a Ford car with ECC IV DCL ECU (not OBD2) that has a RS485 communication balanced lines D( ) and D(-). But my assembled circuit has between A-B 1.49V , A-Ground 3.2v and B-Ground 1.73v and the ECU has between D( )-D(-)4.53v D( )-Groung 4.77v and D(-)-Ground 0.24v What do you think about that tensions levels.?? Could this assembled circuit work whit my ECU. ?? I have tryied to establish communication with ecu but nothing happend. Thanks and Best Regards. Sergio |
| Hello Sirs. I am working in a development to connect the computer with my car. I have a Ford car with ECC IV DCL ECU (not OBD2) that has a RS485 communication balanced lines D( ) and D(-). But my assembled circuit has between A-B 1.49V , A-Ground 3.2v and B-Ground 1.73v and the ECU has between D( )-D(-)4.53v D( )-Groung 4.77v and D(-)-Ground 0.24v What do you think about that tensions levels.?? Could this assembled circuit work whit my ECU. ?? I have tryied to establish communication with ecu but nothing happend. Thanks and Best Regards. Sergio |
| Thank you Sirs. I can do it work, with a few changes. Best regards and Merry Christmas. |
| Hi Sergio, I couldn't write for a few days sorry. Did you change the output resistors to set the line voltage level? |
| Hi Jack. Yes, I did it. You can see that here http://www.postimage.org/image.php?v=PqQCgbA It´s the Ford way. Regards. |
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