Asset - Extension We need a serial communication DLL

We are a small Australian scoreboard manufacturer and have written a scoreboard program using GameMaker Studio due to it allowing us rapid development. We are in need of a serial output for this software that can interface with a relay PCB (we currently have a test unit from

We have tried the currently available Arduino DLL which allows communication through a serial port however it fails to allow us to send the required commands as it sends a text string only.

The specific (byte) commands required are:
254, 0 - Turn off relay 1
254, 1 - Turn on relay 1

It would be ideal that we can send and receive both the bytes of our choosing, and text strings when required (for interfacing with our standard numerical scoreboards). It would be ideal if we could specify the following parameters in the software, however we currently require:
  • 9600 baud rate
  • 8 data bits
  • 1 stop bit
  • No parity
  • No flow control

Please forward your hourly rate (and currency) along with an estimate of how long you think this will take to my email address: We will discuss the specifics afterwards.


ᴏɴʟɪɴᴇ ᴍᴜʟᴛɪᴘʟᴀʏᴇʀ
Forum Staff
Sent an email.

Update: Work was finished and paid for. All is well.
Last edited: