I have add reference "NationalIstruments.NI4882", but can't coding 488.2 command. please see below picture. My OS is WIN 7 64 bit, VS2013, MAX v15.0.0f0, upgrate to new version. Below is my code, can't to build, NI488 code can't complete compile. using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using Ivi.Visa.Interop; //VisaComLibusing NationalInstruments.NI4882;using NationalInstruments.VisaNS;namespace xxx{ class Program { private MessageBasedSession mbSession; static void Main(string[] args) { int noncontroller; char[] buffer = new char[100]; int panelHandle; //Open session to the GPIB board noncontroller = ibfind ("gpib0"); //Release system control ibrsc(noncontroller, 0); //Change GPIB primary address from 0 to 2 ibpad(noncontroller, 2); while(true) { //Update status variable ibwait(noncontroller, 0); //Wait until non-controller is listener and ATN line is dropped. if ((ibsta&LACS)&&(!(ibsta&ATN))) { ibrd(noncontroller, buffer, 100); // Read data bytes buffer[ibcnt] = '\n'; //Add linefeed and 0 to string buffer[ibcnt + 1] = 0; Console.WriteLine("Buffer Value{0}", buffer); //printf("%s", buffer); // Print buffer for C return; } } } }}

Hi, You need to create a Board object. Address boardAddress; Board board; private void butOpen_Click(object sender, EventArgs e) { bool retval = false; try { boardAddress.PrimaryAddress = 0; board = new Board(); //defaults to 0 for GPIB board index number 'GPIB0'. Change to your board number idf required retval = board.FindListener(boardAddress); Debug.WriteLine("FindListener returned " + retval.ToString()); board.IsSystemController = false; retval = board.IsSystemController; Debug.WriteLine("IsSystemController returned " + retval.ToString()); } catch (Exception ex) { Debug.WriteLine(ex.Message.ToString()); } } Debug Output FindListener returned True IsSystemController returned False Good luck! Curt