DH Instruments PPC2+, Manual

Page: 129 / 166

PPC2+™ Operation and Maintenance Manual
Page 121
©2001 DH Instruments, Inc.
4.6.1 PROGRAM MESSAGE DESCRIPTIONS
∗
CLS
Purpose Clear all of the status & event structures.
Command “
∗
CLS”
Remarks This program message clears the following events and status registers:
Standard Byte Register (STB)
Standard Event Status Register (ESR)
Error Queue
Pending OPC operations
Example
(classic)
Sent:
Reply:
“
∗
CLS”
none
∗
ESE
Purpose Read or set the Standard Event Status Enable Register.
Command
Query
“
∗
ESE n”
“
∗
ESE?”
Default “
∗
ESE 0”
Arguments n: ’0 to 255’ This is the decimal representation of the bit(s) to enable.
To enable the PON and QYE bits, the argument would be 128 + 4 =
132.
Remarks The Standard Event Status Enable register determines which bits in the standard
Event Status Register are enabled and included in the Status Byte Register (ESB
bit), and can assert the SRQ line. The reply is in decimal numeric form.
Example
(enhanced)
Sent:
Query reply:
“
∗
ESE=128”(enables the PON bit)
“128” (no reply if IEEE-488)
Errors ERR# 6: n is not valid.
∗
ESR
Purpose
Read the Standard Event Register.
Command “
∗
ESR?”
Remarks The Standard Event Register contents are cleared after reading. The reply is in
decimal numeric form.
Example
(enhanced)
Sent:
Reply:
“
∗
ESR?”
“20” (the QYE and EXE bits are set)
∗
IDN
Purpose
Identify the PPC2+ version, range, and serial number.
Query “
∗
IDN?”
Remarks The identification reply is made up of the manufacture, the model, the serial number
and the software version. Each is separated by a comma.
Example
(enhanced)
Sent:“
∗
IDN?”
Reply:“DH INSTRUMENTS INC, PPC2+ A0100/A0015, 1234, Ver2.00 -dhf”