DB9
You mean RS232 on a 9-pin D-type connector?
Note that it's DE9 - not DB9 (B is the 25-way size):
https://en.wikipedia.org/wiki/D-subminiature#DE-9
You would need an RS232 transceiver to convert the nRF51's 3V logic levels to/from RS232
DB9
You mean RS232 on a 9-pin D-type connector?
Note that it's DE9 - not DB9 (B is the 25-way size):
https://en.wikipedia.org/wiki/D-subminiature#DE-9
You would need an RS232 transceiver to convert the nRF51's 3V logic levels to/from RS232
Thanks, Yes it DE9, to connect rs232 transiever. What is the TX and Rx line of Nrf51 dongle in the Nordic standard firmware ??
RX and TX are connected to the on-board j-link by default, and are used by most of our SDK examples to output debug messages to the PC over UART->USB. But you will need to select some other accessible pins (p0.15-20) if you are going to have your UART output connected to a rs232 bridge.
Default pinout from the pca10031.h board header:
// UART connection with J-Link #define RX_PIN_NUMBER 11 #define TX_PIN_NUMBER 9 #define CTS_PIN_NUMBER 10 #define RTS_PIN_NUMBER 8 #define HWFC true
Could you please share the detailed interface diagram to connect with PC UART connector with NRF dongle. ( What happen if use default Tx and rx pin ?).
Sorry, but I'm not sure I understand what you trying do. As said earlier, you can't use the default TX and RX pins if you are planning to connect the UART interface to an external rs232 converter (link). In that case, you will have to select some new GPIOs that are not already in use.
Schematics and board layout is available on the product page here: https://www.nordicsemi.com/Software-and-tools/Development-Kits/nRF51-Dongle