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UART debug cable question

Created by: faschmidt at: 6/17/2020 8:14 AM (12 Replies)

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6/17/2020 8:14 AM	Rate (0)
faschmidt Experienced Member Joined: 4/17/2018 Last visit: 11/6/2024 Posts: 88 Rating: (5)	Good morning! Hopefully I get my debug cable tomorrow What confuses me, is the wiring. I have +5V, RX, TX, GND on the cable. 5V not needed, GND is clear. But: RX on cable is connected to RX of board or are RX / TX crossed? Wikipedia states it might be either way because of autocrossing ??? And what about PuTTY? Where can I read about the setup (parameters to set) ? Finally: Is there a shell after firing up debug mode? Sorry to bug you with these stupid questions. I am a Simatic guy, sometimes playing Raspberry Pi but this IOT is a completely different beast. T.i.a. Frank

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6/17/2020 8:46 AM	Rate (1)
jan-k Silver Member Joined: 4/28/2015 Last visit: 6/28/2024 Posts: 578 Rating: (43)	The UART settings are 115200 8N1. Regarding rx/tx, it's the usual 50:50 chance: If you do not see any output after powering on, flip those connections, and it should work then. What you get then are first the outputs of the bootloaders, then the kernel boot log, and if that succeeded a login prompt of Debian Linux.

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6/17/2020 8:46 AM	Rate (1)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/5/2024 Posts: 3345 Rating: (379)	Hi , for my cable the connection is crossed: For putty you need the COM device which is assigned to your TTL cable, Serial connection and speed of 115200: Best regards!
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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6/17/2020 9:49 AM	Rate (0)
faschmidt Experienced Member Joined: 4/17/2018 Last visit: 11/6/2024 Posts: 88 Rating: (5)	Nice! Thank you. You have a full-blown pro cable including 6 pin header. Whats the brand? Maybe put those info in the Getting Started Manual as well? I bet there are more dau's like me running around...

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6/17/2020 10:57 AM	Rate (0)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/5/2024 Posts: 3345 Rating: (379)	Hi, it is that one: https://de.rs-online.com/web/p/interface-development-kit/0429307/ Best regards!
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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6/17/2020 12:24 PM	Rate (0)
faschmidt Experienced Member Joined: 4/17/2018 Last visit: 11/6/2024 Posts: 88 Rating: (5)	I see. Thanks. Just one thing:Signal level on the advertised cable is 3.3V. I think the cable I ordered has 5 V signal level. Vcc always is 5 VDC, though. Is this of importance ?

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6/17/2020 1:07 PM	Rate (0)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/5/2024 Posts: 3345 Rating: (379)	Hmm good question. Think jan-k is using a 5V cable and this also works. So in my opinion it doesn't matter. But to be honest I don't know that much about this interface, just how to use it and that it works for my cable with 3,3V. Best regards!
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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6/17/2020 3:22 PM	Rate (0)
jan-k Silver Member Joined: 4/28/2015 Last visit: 6/28/2024 Posts: 578 Rating: (43)	Actually, I'm not sure if my cables are 5V. They are RPi-compatible, I'm using them all around with original or RPi-like boards, and the IOT20x0 devices. But that means they are 3.3V: "All UARTs on the Raspberry Pi are 3.3V only - damage will occur if they are connected to 5V systems."

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6/17/2020 5:10 PM	Rate (0)
faschmidt Experienced Member Joined: 4/17/2018 Last visit: 11/6/2024 Posts: 88 Rating: (5)	So, jan, you told me that cable was correct (see my other post)? I just hooked up my meter to the X14 pins and measured 3.3 VDC on the negated outputs. Ah: Here's more data: https://paradisetronic.com/de/bauelemente/programmiergeraete-zubehoer/usb-ttl-uart-wandler-kabel-serielle-schnittstelle-cp2102 I guess the 5 Volt is the auxiliary voltage on the red wire. Hm.. To be or not to be...
	Last edited by: faschmidt at: 06/17/2020 17:19:53
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6/18/2020 10:42 AM	Rate (0)
jan-k Silver Member Joined: 4/28/2015 Last visit: 6/28/2024 Posts: 578 Rating: (43)	The key is "TTL to USB" because that means 3.3V. I would just refrain from connecting 5V power pin. GND, RX, TX, those three are sufficient and will work.

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