RS 485 Communication - Howto - What is it? - Monitoring Hadware
Posted on 2004-11-10
This is quite urgent.
I have the oppertunity to develop an app for an engineering company. This company is in the pump building business.
They allready had someone else rig them up a hardware panel with four LCD's for getting readouts from the pump.
These LCD's each sit ontop of their own "unit", which I guesse is responsible for reading the data and displaying it on the LCD.
The Units all have an RS-485 port (to me it looks like a RJ-45 ethernet port...anyway), which is supposed to transmit that data displayed on the LCD through the RS-485 port. My Job will be to read that data from each unit, and draw appropriate graphs and other stuff from the values.
From what I can tell on the net...RS-485 is a kind of a serial network, where you can have 32 devices talking on one twisted pair cable at the same time.
What I need to know is how do I communicate with these devices from let's say VB, and then also what port will I use on my PC...ethernet or serial.