HP E1418A, Service Manual

Page: 21 / 96

For example, if the following six integers are returned, the module has the
configuration indicated.
Integer Decimal
Value
Configuration
1st 7 No expansion board installed
(Only channels 1 through 8)
2nd 7 No Terminal Module installed or
unknown terminal module installed
3rd -1 All channels are non-isolated
4th -1 All channels are voltage output channels
5th -1 All channel outputs are disabled
(all output relays are open)
6th -1 All channels are output mode
programmable
Configuration Example
The following program segment demonstrates how to read the module
identification string and the configuration. The configuration integers are bit
manipulated using the C operator for bit shifting
result = result <<1
(a one bit shift to the left). The code shown in this example can be obtained
from the file
prftest.c
on the examples disk provided with this manual.
/** FUNCTION PROTOTYPES **/
void main (void);
void err_handler(ViSession vi, ViStatus x); /* VTL error routine */
void sys_err(ViSession resource); /* Checks for SCPI programming errors */
/** GLOBAL **/
ViStatus err;
ViSession defaultRM, cmd, dac, dmm;
int num_chan;
void main (void)
{
int i,result = {0},config [6]={0},num_chan = {0};
err=viPrintf(dac, “DIAG:CONF?\n”); /* request module configuration */
if(err VI_SUCCESS) err_handler(dac, err);
err=viScanf(dac, “%,6d”, &config);
/* returns six integers */
if(err VI_SUCCESS) err_handler(dac, err);
sys_err (dac); /* SCPI error check
*/
Chapter 3 Operating Information 21