Bronson_alex:
If I were you, I would use UNO + SoftwareSerial, because:
- Much simpler connection
- It seems the protocol of the light meter is quite simple, so no need to use converter (99% of my projects that involve connecting RS232 devices don't require converter)
Thank you so much, Bronson.
But according to the attached images from Instruction Manual , the light meter has two output ports(USB and RS-232). It also mentions that the RS-232 port is used for connecting with printer, whereas the USB is used for communication with PC. So I'm confused which one should I use for connecting with Arduino. The printer doesn't send any command to control the light meter through RS-232 cable, so I'm thinking should I use the USB port since it is used for connecting with PC?
