RS232-TTL convert

Hello everyone, as everyone here who is new to Arduino and this universe here,I would like to start and conversation about Arduino that I'll be using (trying) with connection mentioned above.
Regardless of that I have a few questions starting with :

I want to control the sewing machine control box using Arduino. Possible?

Control box is Efka AB221A

Question : Did anyone tried to do so and achieve?

Connection required are :

Data transfer according to ISO 1745.
Protocol used is IF232
Bits are : 8 bits 0 parity and 1 stop bit
Baud rate: 9600
Connector are SUB-D-9
connector have pins RxT And TxD
What im trying to do is first of course to establish the serial monitoring for Arduino so I can read wich data is sent or IS any data sent at all so i can proceed and make a data package to sent back and try to control the mashine in such a way that can be used for specific paterns of sewing. There's also already a display for that wich is provided by manufacturer and is used for making that paterns for sewing. Display is LCD graphical and probably is using a HMI wich is connected on the second SUB-D-9 connector.>>>In the end I'm trying to get info of wich data is sent when control box is a master so I can control it later when i make code for controlling it with touch display mounted on Arduino Mega<<<
I should mention that in parameters inside of the control box there's also a parameter for using control box as a master TO the second one or the slave FOR the second one.

Any suggestions how to start?? Thanks in advance :slightly_smiling_face:

Your connector MUST also have a ground pin that the RxT and TxD are referenced to. Have you identified those pins?

Yes I have the ground (com)
Sorry for not mentioning. :confused:

That is intended to connect to a PC or laptop with RS232 voltage levels (-12V and +12V).

To connect such a device to a 5V or 3.3V Arduino, you need an RS232 voltage level converter, like this one.

Ok. I have ordered one already coming in 3-4 day's.

I forgot to mention that connector is used for couple of things. Ill provide pictures. Also I forgot to mention that is used also for the software update via pc with custom compiler named c200 compiler wich only can be purchased from manufacturer.


It's a >>...B18...<< socket

In RS-232 the UART RX/TX signal level is inverted and extends from -12V to +12V.

I'll search for it to understand what that means. Or if I'm not bothering to much,what that means for my implementation?

If you use a RS232-to-TTL converter (like mentioned by @jremington), it will take care of the inversion for you.

Ok. I'll post the screenshots once I see what's going on with this madness. Thanks for info people!

Please post text, not screenshots.

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