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Using the Keysight E1459A Module
Digital Input
The Keysight E1459A is capable of simple digital inputs on any of the individual
four ports or combined Ports 0 and 1 or Ports 2 and 3. The
subsystem (see Chapter 3 for details) provides two commands for reading the
current value of the input ports:
Example 2: Digital Input
This program reads Port 0 as an individual 16-bit port and then it reads the
combined Ports 2 and 3 as a 32-bit port. The values returned are a signed 16-bit
integer for Port 0 and a signed 32-bit integer for combined Ports 2 and 3.
Although this program does not decode the returned value to determine
individual bit/channel values, a "0" in any bit position indicates the input to the
corresponding channel is low; a "1" in any bit position indicates the input to the
corresponding channel is high.
/* Digital Input Example
Created in Microsoft Visual C++
#include <visa.h>
#include <stdio.h>
#include <stdlib.h>
#define INSTR_ADDR "GPIB0::9::3::INSTR"
/* E1459A logical address */
int main()
{
ViStatus errStatus;
/* status from VISA call */
ViSession viRM;
/* Resource Mgr. session */
ViSession E1459;
/* session for E1459A */
int val;
/* value of Port 0 */
long val1;
/*Value of Ports 2 & 3 */
/* Open a default Resource Manager */
errStatus = viOpenDefaultRM (&viRM);
32
MEASure:DIGital:DATAn:type:VALue?
MEASure:DIGital:DATAn:type:BITm?
This program reads the current value of Port 0 (16-bit word)
and combined value of Ports 2 and 3 (32-bit word)
if (VI_SUCCESS > errStatus){
— reads the current port value
— reads an individual bit value
*/
Keysight E1459A/Z2404B User and SCPI Programming Guide
Power-on / Reset States
MEASure
command
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