User manual

IEEE-488 Reference
2001-900-01 Rev. K/ August 2010 4-3
ler. The maximum cable length is 20-
meters, or two meters times the number of
devices, whichever is less. Failure to ob-
serve these limits may result in erratic bus
operation.
Custom cables may be constructed by using the information
in q~ÄäÉ=QJN and cáÖìêÉ= Q JQ=. q~ÄäÉ=QJN lists the contact as-
signments for the bus, and cáÖìêÉ= QJQ= shows the contact
configuration.
q~ÄäÉ=QJN
IEEE contact designations
4.3 Primary address selection
The Model 2001 must receive a listen command before re-
sponding to addressed commands. Similarly, the unit must
receive a talk command before transmitting data. The Model
2001 is shipped from the factory with a programmed primary
address of 16.
The primary address may be set to any value between 0 and
30 as long as address conflicts with other instruments are
avoided. Note that controllers are also given a primary ad-
dress, so do not use that address either. Most frequently, con-
troller addresses are 0 or 21, but you should consult the
controller’s instruction manual for details. Whatever prima-
ry address you choose, you must make certain that it corre-
sponds with the value specified as part of the controller’s
programming language.
To check the present primary address or to change to a new
one, perform the following procedure:
1. Display the MAIN MENU by pressing the MENU key.
2. Use the cursor keys ( and ) to place the cursor on
GPIB and press ENTER. The GPIB/PRINTER SETUP
menu will then be displayed.
3. Use the cursor keys to place the cursor on
ADDRESSABLE and press ENTER.
4. The current primary address of the instrument will be
displayed. For example, if the instrument is set to
primary address 16, the following message will be
displayed:
ADDRESS = 16 (0-30)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
DIO1
DIO2
DIO3
DIO4
EOI (24)*
DAV
NRFD
NDAC
IFC
SRQ
ATN
SHIELD
DIO5
DIO6
DIO7
DIO8
REN (24)*
Gnd, (6)*
Gnd, (7)*
Gnd, (8)*
Gnd, (9)*
Gnd, (10)*
Gnd, (11)*
Gnd, LOGIC
Data
Data
Data
Data
Management
Handshake
Handshake
Handshake
Management
Management
Management
Ground
Data
Data
Data
Data
Management
Ground
Ground
Ground
Ground
Ground
Ground
Ground
*Numbers in parentheses refer to signal ground
return of referenced contact number. EOI and REN
signal lines return on contact 24.
cáÖìêÉ=QJQ
Contact assignments
CONTACT 12 CONTACT 1
CONTACT 13CONTACT 24