Question

Hey,

is it possible by software to get a "High" Signal out of the DTR pin 4 or the RTS pin 7 of the serial port? Currently they both have 0 V. I need it for powering a RS232 Converter: https://www.victronenergy.com/live/vedirect_protocol:faq#q2when_using_the_vedirect_to_rs232_interface_what_pins_do_i_need

Thank You.

Answer 1

Hi,

For this you will have to use crossover adapter.

Also, with our stock firmware you will not be able to change DTR to high, you will have to write yourself a C program/script or use picocom (or microcom) to do so.

https://www.xanthium.in/Controlling-RTS-and-DTR-pins-SerialPort-in-Linux

EB.

Comments

Thank You very much, I'll soon look into the software side, and if I find a solution, I'll post a summary here.

But I think, I need a straight cable, not crossover, since the solar charger is a DTE component (sending on 3 and receiving on 2) and the RUT955 is a DCE component (sending on 2 and receiving on 3), referring to here: https://wiki.teltonika-networks.com/view/RUT955_RS232/RS485#RS232_Connector_Pinout

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Ok, now I start digging into it.

First option: c-progam. Is there a recommended (hopefully easy) way of compiling programs for the RUT955?

Second option: picocom. It has at least an option to toggle the DTR line. But how can I get picocom on the RUT955? It is not installed, nor found by opkg.

Third option: microcom. I don't see any option to set RTS or DTR. Have I missed something? Or are there any commands I could send? But as I understand, the commands get send VIA serial, not parsed by the serial device itself. So, I don't see any sense in sending AT commands or something. Still tried it and expectedly it didn't work.

Any help / pointing in the right direction is appreciated.

Thank You.