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Topic: Can i acess a serial LCD through an actual serial port (DB9) via Arduino (Read 873 times) previous topic - next topic


I am trying to use my UNO to control a serial LCD that is hooked up to teh back of my computer through the DB9 serial connection. is this possible.

I haven't had any success connecting to my Matrix Orbital Serial LCD's via hooking them right into Arduino. I know my displays work via RS232 and a serial cable hooked to the back of my PC because they all work perfectly using LCDC software to drive them. Yes i soldered the jumpers after that to convert it to TTL serial.

This should be possible i hope? talking to the display through Arduino via USB then into the pc then out the serial and into the display?

any help would be appreciated. along with a very basic confirmed general "hello world" sketch would be awesome.


Could you give a link to that display ? (just copy the url in a post).

You should be able to connect it to an Arduino.
Sometimes a serial port is able to switch between 'real' RS232 and TTL-level serial data, but sometimes also the signal has to be inverted. The 'real' RS232 higher voltage signal uses inverted levels.

It should even be possible that the Arduino acts as if it is a display.


lk162-12 http://www.matrixorbital.com/product_info.php?products_id=73

lk202-25-v http://www.matrixorbital.com/product_info.php?products_id=49

lcd4041 http://www.matrixorbital.ca/manuals/LCDVFD_Series/LCD_VFD_Legacy/LCD4041.pdf

I have all these matrix orbital serial displays. some can handle ttl with jumpers they are all rs-232 capable.

I am basically wondering if instead of opening the serial monitor you can just open another port that the display is using and export to that. No physical connection of the display directly to the arduino and i would be using non ttl levels this way.


What do you want ?
Using the LCDC software works, but what is the next step ?
Do you want serial ports on your PC to connect a few displays ? or do you want usb plugs to connect to the displays ? Or perhaps a single Arduino that controls a whole bunch of them ?

If you want a simple serial terminal, you could try the Q Serial Terminal, http://qst.sourceforge.net/
That way you don't have to start the Arduino IDE.


I thought i explained it but ill try again, I have a serial lcd display 5 of them actually. I have a serial connector on the back of my computer. I dont have a serial connector on the back of the arduino. I want to use the arduino to write things on the serial LCD as its hooked up to my computer. Why mainly right now because i cant get the damn things hooked up to the arduino itself.

so basically i want to know if the arduino is capable of sending the serial data through the IDE and istead of printing it on my computer screen in the serial monitor it just sends it to the serial lcd hooked up to the serial port on my computer.

I know the displays work plugged into the back of my pc but soldering jumpers etc just havent worked out as of yet hooking it through the arduino. So i want to use what i know works and plus its more convenient if ti works this way for learning debugging etc. because it sucks not knowing if the code is wrong or the thing isn't wired up correctly i can eliminate one of the two.

anyway yeah to the last guy asking what i want to do its actually all summed up in the one sentence title for this thread but i went ahead adn wrote out  a few paragraphs as i havent had much success on this forum communicating i guess.

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