Timeline for FTDI USB to serial communication issue
Current License: CC BY-SA 4.0
17 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 14, 2018 at 16:13 | vote | accept | m-walker95 | ||
| Nov 10, 2018 at 0:40 | answer | added | m-walker95 | timeline score: 1 | |
| Nov 7, 2018 at 17:51 | comment | added | m-walker95 | imgur.com/a/DbySnNf Here are the scope captures. I think @PeterBennett was correct. Thank you for your help. I have ordered a "USB TO TTL SERIAL CABLE" from adafruit to confirm this was the issue. | |
| Nov 7, 2018 at 5:24 | comment | added | Chris Stratton | You really need to post a screenshot from a scope showing the signal. It would also be helpful to identify the board and perhaps provide a picture of the circuitry surrounding the connector. Are you sure you actually have the pinout correct and the ground connected? | |
| Nov 7, 2018 at 1:05 | comment | added | m-walker95 | I tried polarity inversion on TX and RX and it still is not working. | |
| Nov 7, 2018 at 0:32 | comment | added | jsotola | you can download FT_PROG here ftdichip.com/Support/Utilities.htm#FT_PROG ..... it is a utility to configure the FTDI chip ..... you can use it to invert the data lines | |
| Nov 7, 2018 at 0:22 | comment | added | user105652 | Encryption of any kind should not be an issue here. With these simple devices encryption has to be enabled in code, and it would not look like a simple polarity inversion issue. | |
| Nov 7, 2018 at 0:16 | comment | added | jsotola |
0x22 (") comes up as 0x37 (7) ..... 00100010 comes up as 00110111 (if inverted it is 11001000) ...... i think that the polarity of the signal is inverted
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| Nov 7, 2018 at 0:13 | comment | added | m-walker95 | "Perhaps the FTDI cable uses "RS-232" levels, and the board is "TTL" levels (or vice versa). The "TTL" signal levels are inverted relative to RS-232. Mixing the two will result in garbage like you show. " I will check this with a scope thanks. | |
| Nov 7, 2018 at 0:02 | comment | added | jaskij | Another think to check is the word size. While it's usually 8 bits, 7 is also often used and there are other possible values. | |
| Nov 7, 2018 at 0:00 | comment | added | m-walker95 | "It sounds like you're not using the same encoding on both ends of the cable?" How do i change the encoding of the tera term of FTDI cable? | |
| Nov 6, 2018 at 23:59 | comment | added | m-walker95 | I have not tried every baud rate but i have tried 4 different slower baud rates than i am using. | |
| Nov 6, 2018 at 23:58 | comment | added | Peter Bennett | Perhaps the FTDI cable uses "RS-232" levels, and the board is "TTL" levels (or vice versa). The "TTL" signal levels are inverted relative to RS-232. Mixing the two will result in garbage like you show. | |
| Nov 6, 2018 at 23:55 | comment | added | Hearth | It sounds like you're not using the same encoding on both ends of the cable? | |
| Nov 6, 2018 at 23:55 | comment | added | jsotola | have you tried every baud rate available? | |
| Nov 6, 2018 at 23:55 | review | First posts | |||
| Nov 7, 2018 at 0:45 | |||||
| Nov 6, 2018 at 23:50 | history | asked | m-walker95 | CC BY-SA 4.0 |