Hello I'm new here,
I am currently working on a project where I need to save the data I get from a Photometer using Arduino so we can graph this after.
The problem I have is that in my datasheet it states on page 5, that there is a BCD output interface using 5V TTL but the port used to connect it is of type RS232-DB9
I looked up some things about RS232 and found out that RS232 usually goes from -13v to 13v with -13V sending a 1 and 13V sending a 0.
This is where I'm a bit confused.
can I hook it up directly on my Arduino or will I still need some kind of shield?
Also I tried hooking it up using a cheap Arduino I didn't use much and ran the serial.read code.
The code is the same as the example code from Arduino.
I wired the ground and TX -> arduino RX and RX -> arduino TX.
The only data I get through is a number between 0-255 and not of BCD value?
I have a picture of the machine with the port in attachment and also the datasheet of the photometer
Thanks for the help in advance,