10
PRS-200 Series
IEEE INTERFACE OPTION
Chapter 5
IEEE INTERFACE OPTION
5.1 Introduction
The IEEE interface option makes the PRS-202 a
IEEE-488.2-1987 and SCPI 1994.0 compatible instru-
ment.
The IEEE STD 488.2 covers the electrical and me-
chanical bus specifications, and state diagrams for
each GPIB bus function. It also establishes data for-
mats, common commands for each 488.2 device and
controller protocols. The standard is available on-line
at http://www.ieee.org or by contacting the IEEE at:
IEEE Corporate Office
3 Park Avenue, 17th Floor
New York, New York
10016-5997 U.S.A.
Tel: +1 212 419 7900
The SCPI standard provides a tree like series of stan-
dard commands for programmable instruments so that
similar instruments by different manufacturers can
be controlled by the same program. SCPI informa-
tion and a command reference are located in Appen-
dix A.
5.2 Capabilities
The IEEE option provides remote control over all func-
tions except
POWER
.
5.3 Address Switch and
Communications Settings
Each GPIB bus device is identified by a five-bit bi-
nary address. There are 32 possible primary addresses
Decimal
Address
SWITCH
SETTINGS
5-4-3-2-1
Decimal
Address
SWITCH
SETTINGS
5-4-3-2-1
0
0-0-0-0-0
16
1-0-0-0-0
1
0-0-0-0-1
17
1-0-0-0-1
2
0-0-0-1-0
18
1-0-0-1-0
3
0-0-0-1-1
19
1-0-0-1-1
4
0-0-1-0-0
20
1-0-1-0-0
5
0-0-1-0-1
21
1-0-1-0-1
6
0-0-1-1-0
22
1-0-1-1-0
7
0-0-1-1-1
23
1-0-1-1-1
8
0-1-0-0-0
24
1-1-0-0-0
9
0-1-0-0-1
25
1-1-0-1-0
10
0-1-0-1-0
26
1-1-0-1-0
11
0-1-0-1-1
27
1-1-0-1-1
12
0-1-1-0-0
28
1-1-1-0-0
13
0-1-1-0-1
29
1-1-1-0-1
14
0-1-1-1-0
30
1-1-1-1-0
15
0-1-1-1-1
31
Reserved,
do not use
0 through 31; addresses 0 and 31 are reserved . The
PRS
BUS ADDRESS
switch on the rear panel es-
tablishes the GPIB address of the unit. Bus address
settings are read at power up. Refer to table 5.1.
5.4 IEEE Option Operation
The IEEE controller asserts remote mode upon re-
ceipt of a valid command. The
REMOTE
LED will
light and impedance settings will be controlled through
the IEEE interface
if
the
REMOTE/LOCAL
switch
is in the
REMOTE
position. Remote control may be
dropped by issuing an IEEE GTL command. Drop-
ping remote sets the PRS output to the value selected
via the front thumbwheel switches. See Chapter 3
for information about
REMOTE/LOCAL
function-
ality.
Table 5.1 IEEE Bus Address Settings
