"Gokul" <[EMAIL PROTECTED]> wrote: >I am trying to acquire data using LabView from KV16AR >PLCs data memory. A program in PLC is going to dump >data in PLCs data memory and LabView is going to >simultaneously acquire it. The transmission is over >serial port and I have done serial port acquisition >before with temperature controllers. > >I felt both type of acquisition are the same...but >still wanted to ask... Is this any different? ... I >have never worked with PLCs before..thats why wanted >to know.
Well serial programming is serial programming! But then no device or protocol is really the same. RS-232 means recommended standard and is not always followed to the word but even then only really specifies the electrical chararacteristics. The protocol depends on the the more or hopefully less warped mind of the original developer. As long as it is decently documented there is always a way to make it work, serious bugs in the device firmware excluded. If you have working C or even Basic sample code that usually helps too to understand what the protocols intimate details are. There is no reason to assume that PLCs are worse or better in their design of the cummunication protocol than any other device, other than there might have been a tendency in the past to cook up its own protocol to make sure they can sell their own programming tools and peripheral devices. Rolf Kalbermatter CIT Engineering Nederland BV tel: +31 (070) 415 9190 Treubstraat 7H fax: +31 (070) 415 9191 2288 EG Rijswijk http://www.citengineering.com Netherlands mailto:[EMAIL PROTECTED]
