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UART and RS485 for DigiConnecore devlopments Kit

0 votes
Hi:
Digi ConnectCore 6Plus Devlopment Kits

https://www.digi.com/resources/documentation/digidocs/embedded/dey/3.0/cc6plus/bsp_r_uart_cc6cc6qp

UART1 and UART3 are 4-wires, RS-232 level.

UART5 is 4-wires, TTL level.

Question:
1) UART1 and UART3 should be able to connect directly to connect to any industrial devices directly without any RS232 shifter , correct?

2) UART5 need a shifter to use with any industrial devices, correct?

3) Where is Pin 1 located? is it near to the MIPI Display connector ?
https://www.digi.com/resources/documentation/digidocs/pdfs/90001499.pdf

4) If UART5 is assign at RS485 the shifter is still required? Link below
https://www.digi.com/resources/documentation/digidocs/embedded/dey/3.0/cc6plus/bsp_r_uart_cc6cc6qp#example-configure-rs-485-port-on-connectcore-6-plus-sbc.


5) How to modify the device tree as per Link above to assign UART5 as RS485?


Regards

simon
asked 4 days ago in Linux by simonongsk New to the Community (1 point)

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1 Answer

0 votes
Are you asking about module or the SBC?
on the module all ports are TTL 3.3v level, on the SBC on the expansion connector:

UART1 and UART3 are 4-wires, RS-232 level.

UART5 is 4-wires, TTL level. (3.3V)

> UART1 and UART3 should be able to connect directly to connect to any industrial devices directly without any RS232 shifter, correct?

RS485 device tree can be found here:
https://www.digi.com/resources/documentation/digidocs/embedded/dey/3.0/cc6plus/bsp_r_uart_cc6cc6qp


The TTL level depends on the VCC of the device so it is not always 3.3v on all devices. Many of them are 5V
answered 4 days ago by LeonidM Veteran of the Digi Community (4,278 points)
Hi:
    I have the SBC. That means the UART1 and UART3 and UART5 are all at 3.3v.

 May I know where is Pin 1 ? (I am unable to paste picture).

Also , how and where to modify the device tree for UART5?

Thanks
> May I know where is Pin 1 ? (I am unable to paste picture).
towards the middle of the board aways from the corner

>Also , how and where to modify the device tree for UART5?
I've provided the link above:
&uart5 {
    linux,rs485-enabled-at-boot-time;
    rs485-rts-active-high;
    rs485-rx-during-tx;
    rs485-rts-delay = <1 1>;
    status = "okay";
};
...