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Serial console

All our edge devices have a serial console on a 4-pin JST connector for debugging purposes with 115200 baud 8N1:

Serial console using the example of the smartRAIL V2: orange marking

Pin assignment in the edge device​

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**Attention: these lines only have 3V3 level (and not RS232 level) and are unprotected on the CPU.

The connector on the circuit board is the article B4B-EH-A from JST: https://de.farnell.com/jst-japan-solderless-terminals/b4b-eh-a-lf-sn/stecker-eh-top-4kont-2-5mm/dp/1830714

TTL-232R-3V3 from FTDI: https://de.farnell.com/ftdi/ttl-232r-3v3/kabel-usb-ttl-pegel-seriell-umsetzung/dp/1329311

Connection of the TTL-232R-3V3 to the JST connector​

Use 4.7k ohm resistors for protection between the TTL232R-3V3 and the 4-pin connector of the edge device.