Fluke 522A/6, Operator'S Manual

Page: 181 / 426

Remote Operations
Checking 5522A Status
5
5-39
Po w er on. This b it is set to 1 if line po w er has b een t u rned off and on since the last
time the ESR w as read.
Command error. The 5522A’s IEEE-4 88 interface enco u ntered an incorrectly formed
command. (The command ERR? fetches the earliest error code in the error qu e u e,
w hich contains error codes for the first 15 errors that ha v e occ u rred.)
Exec u tion error. An error occ u rred w hile the 5522A tried to exec u te the last command.
This co u ld b e ca u sed, for example, b y a parameter b eing o u t of range. (The command
ERR? fetches the earliest error in the error qu e u e, w hich contains error codes for the
first 15 errors that ha v e occ u rred.)
De
v ice-dependent error. An error related to a de v ice-dependent command has
occ u rred.
Q u ery error. The 5522A w as addressed to talk w hen no response data w as a v aila b le
or appropriate, or w hen the controller failed to retrie v e data on the o u tp u t qu e u e.
Operation complete. All commands pre v io u s to reception of a *OPC c ommand ha v e
b een exec u ted, and the interface is ready to accept another message.
PO N
CME
EXE
DDE
QYE
OPC
15 14 13 12 11 10 9 8
0 0 0 0 0 0 0 0
7 6 5 4 3 2 1 0
PON 0 CME EXE DDE QYE 0 OPC
gjh048.eps
Figure 5-10. Event Status Register (ESR) and Event Status Enable (ESE)
Programming the ESR and ESE
To read the contents of the ESR, send the remote command,
*ESR?
. The ESR is cleared
(set to 0) every time it is read. To read the contents of the ESE, send the remote
command,
*ESE?
. The ESE is not cleared when it is read. When you read either register,
the Calibrator responds by sending a decimal number that when converted to binary
represents bits 0 through 15. The following sample BASIC program retrieves the contents
of both registers:
10 ! THIS PROGRAM READS THE ESR AND THE ESE REGISTERS
20 PRINT @6, “*ESR?” ! ASK FOR THE ESR CONTENTS
30 INPUT @6, A% ! RETRIEVE THE REGISTER CONTENTS
40 PRINT @6, “*ESE?” ! ASK FOR THE ESE CONTENTS
50 INPUT @6, B% ! RETRIEVE THE REGISTER CONTENTS
60 PRINT “ESR = “;A% ! DISPLAY THE ESR REGISTER CONTENTS VALUE
70 PRINT “ESE = “;B% ! DISPLAY THE ESE REGISTER CONTENTS VALUE
80 END
Convert the contents of variables A and B into binary, and you can read the status of the
registers. For example if A is 32, its binary equivalent is: 00000000 00100000. Therefore,
bit 5 (CME) in the ESR is set (1) and the rest of the bits are reset (0). This means that the
Calibrator tried to execute an incorrectly formed command.