Getting EABO timeout error with Tektronix Scope

[NightElf]

Sorry About this , I know I hae already posted in the VISA forum but being completely new to this I really wasn't sure where this belonged and realized that I may have posted this in the wrong place after I had done it.I also didn't fina a way to delete my original posts


I am a student working on a project for Institute of Plasma Research India
to develop an application in C using Borland C/c++ 4.0 Builder for data acquisition from a Tektronix TDS540D oscilloscope.
I Am using windows98 as my OS
I have Made this rudimentary program to begin with adapted from an example file.

#include
#include
#include


void main() {


int osc,i;
char reading[30];


if ((osc = ibdev(0, 1, 0, T10s, 1, 0)) < 0)
report_error(osc,"Could not open Oscilloscope");


ibwrt(dmm, "*IDN?", 13L);
if (ibsta & ERR)
report_error(osc,"Could not initialize Oscilloscope");


ibrd(osc, reading, 20L);
if (ibsta & ERR)
report_error(osc, "Could not read data from oscilloscope");


reading[ibcnt] = '\0';


printf("Data read: %s\n", reading);


/*Request voltage Reading*/


ibwrt(dmm, "VOLTS?", 6L);
if (ibsta & ERR)
report_error(osc, "Could not trigger oscilloscope");


ibrd(osc, reading, 20L);
if (ibsta & ERR)
report_error(osc, "Could not read");


reading[ibcnt] = '\0';


printf("Data read: %s\n", reading);


ibonl(osc, 0);
}


report_error(int fd, char *errmsg) {


fprintf(stderr, "Error %d: %s\n", iberr, errmsg);
if (fd != -1) {
printf("Cleanup: taking board off-line\n");
ibonl(fd,0);
}
exit(1); /* abort program */
}


After the execution of the program by manually linking this to Borlandc_gpib32.obj file The scope gives the correct information regarding its identification.
However when it comes to the part for taking a reading , i get a EABO error citing time out operations.
Now I am assuming that this is because the command i used to trigger the scope to take voltage readings was incorrect..
Do I need to trigger it to set it up to take Voltage treadings in say DC and then take the readings?..
Ia "VOLTS?" the correct command to take the reading for voltage?
Could Anyone enlighten me on the correct commands used with this instrument?
Thanx a lot.

[Geneva L.]

This is a duplicate of the following thread:
http://exchange.ni.com/servlet/Redirect?id=10293882