Hi all!

I hope you guys can help me and that this is the right section of this website.

I require a serial communication between my pc and a 3D printer but the part that makes that happen is nowhere to be found (second hand 3D printer). Unfortunately, this part was also taken out of production permanently. For this reason, I decided to make a replica version of my own. I know the parts that are required: "MM232R USB Serial UART Development Module" and a 10-way wire-to-board UEXT connector (F). The connector is meant to connect the part to the Olimex A13 board inside the 3D printer.

My problem is that I do not know how to correctly wire those the module and the connector together. Could you please help me with that? I included the documentation I have below and in the attachments.

Thank you in advance!

Thomas

Documentation:
- Datasheet of the MM232R Module: https://www.ftdichip.com/Support/Documents/DataSheets/Modules/DS_MM232R.pdf
- Pin-out document for the UEXT connector used on the Olimex A13 board: https://www.olimex.com/Products/Modules/UEXT/resources/UEXT_rev_B.pdf

The original part:
The MM232R Module:
The MM232R Module Pinout:
The UEXT Connector Pinout:

 

The 'edit post' button vanished but I wanted to add something to my initial post. I'll do it this way.
I wanted to address

• that I understand how to connect Vin, GND, TX, and RX pins but there are several Voltage-in pins, there are shield pins and other pins that I am less familiar with. And
• that there is a good chance that the SCL, SDA, MISO, and MOSI pins on the

 

Hi Thomas I see from the data sheet that:
"The UEXT connector gives user an opportunity to connect different modules to the
host via I2C, SPI and RS232 interfaces with CMOS levels"

The SCL SDA is for I2C and the MISO MOSI SCK are for SPI communications.. (I forget which one of these uses the SSEL).

So for "cmos" RS232 you only need the TX and RX lines.
Usually the TX refers to the Signal out.. and the RS signal in, so actually you have to "cross" these lines...
Module MMR232 RX to UEXT TX
Module MMR232 TX to UEXT RX

Nowadays many of the RS232 (synchronisation & hand shaking) lines are not actually used but they are still available on the FDTI chips.

Good luck!

 

Thank you for your reply!

Yes! that is indeed a confirmation that I needed, the TR on the connector needs to go to the RX on the module and vice versa (to "cross" them). But as can be seen on the connector, 5 cables are used. Now we know how to attach the TX and RX and the GND is not a problem either. I am still left with the 3.3V pin on the connector, which of the V pins is the right one on the module? Then there still is one cable used on the UEXT connector which is unknown to me. Is this the SCK then?