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From: Eltek on 23 Jan 2006 03:40
Hi,
 
I want to use LabVIEW to communicate with a uC'er via an USB/RS485 device. The communication protocol is set up to 9 databits (9'th data bit specify address/command).
How can this be solved in LabVIEW ??
VISA serial port configuration only accept 5-8 databits.
Is it possible to 'build' the RS485 commands bit by bit, and easily transmit them (on a COM port) using LabVIEW ??
From: unclebump on 23 Jan 2006 05:40
Modbus uses 8 databits plus a parity bit for a nine bit datastream. Over 15 years ago, I had to make a Modicon P190 programmer talk to a VAX computer over the broadband network. I fought this setup for weeks until I found out that the broadband modems did not support a nine bit datastream. A different version of the modems did support nine bit data streams. It should not be a problem from the computer side of things. Implementing the correct protocol inside labview will be the tricky part.
Message Edited by unclebump on 01-23-2006 04:15 AM
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