Communication With a Digital Scale

Using Arduino Project Guidance
1

Hello, I am trying to read the serial output from an Ohaus Scout Pro Digital Scale, I am sure that i have found the serial output of the scale but reading the output with the Arduino and the serial monitor is resulting in gibberish. My Arduino is 5V and the serial output of the scale idles at 3.3V and transmits at 0V. Does anyone have any idea why I cant read what the scale is outputting? I have a USB cable for the scale that connects to a 12 pin connector on the scale and when i try to read the virtual com using the Arduino serial monitor I get gibberish as well. I can change the baud rate on the scale but so far i haven't gotten anything to work. My end goal for this project is to read the serial data and then transmit the weight over Bluetooth to a computer.

Edit: Here is some of the documentation for the scale:
product page: http://us.ohaus.com/us/en/home/products/product-families/SP-US.aspx
rs232 interface: http://dmx.ohaus.com/WorkArea/showcontent.aspx?id=27342
user manual: http://dmx.ohaus.com/WorkArea/showcontent.aspx?id=4196
usb interface: http://dmx.ohaus.com/WorkArea/showcontent.aspx?id=3600

2

Arduino serial defaults to 8 bit. The scale is 7 bit. Have you tried to change either Arduino serial or scale serial so the data bits match?

3

I did not realize that, I set the scale to 1200/8-N and the arduino serial monitor to 1200 baud and im still getting gibberish though...

UPDATE: I can now read the weight from the scale over the USB interface and the Arduino serial monitor, I still cannot read the raw serial pin with my arduino though :frowning: Im trying to get this data to a Bluesmirf HID module

UPDATE2: its working! thank you.

4

Howdy

I'm just about to start a similar project to yours. Do you have any tips for finally getting things to work?

Thanks!

5

Reading Weighing scale data from USB host in Arduino Yun

http://forum.arduino.cc/index.php?topic=284254.msg1993789#msg1993789