Serial Communications

[mmervenne 0]

I need to communicate serially with an Heidenhahn Encoder Display to a FX2N. The equipment is something the customer already installed so it was not speced out by me, unfortunately, so serial is the only way i can go. I was wondering if anyone had any tips on continuously getting serial information from an external device. I am also concerned about speed. Any help is greatly appreciated. Thanks Mike

[Sergei Troizky 26]

You have to know the transmitter protocol. If it transmitts a header and is not faster than 19.2K then the task is not difficult. The second RS232 port will be necessary on the PLC, so the extension slot must be not occupied by anything else. The received data update may happen in every PLC scan, but guaranteed only every second scan. Edited 11 Jan 2006 by Sergei Troizky