Lake Shore Model 475 Gaussmeter User’s Manual
6-2
Remote Operation
6.1.1
Changing IEEE-488 Interface Parameters
Two interface parameters. address and terminators, must be set from the front panel before communication with the
instrument can be established. Other interface parameters can be set via the interface using the device specific commands
provided in Paragraph 6.3.
To set the IEEE-488 parameters, press the
Interface
key and press
Enter
to skip past Serial Interface Baud Rate. The
following computer interface screen appears as a prompt for the IEEE-488 address.
Se l e c t Wi t h ° ®
I EEE Ad d r e s s 1 2
Use the
or
key to select an address between 1 and 30. The default is twelve. Press
Enter
to accept the new
selection and continue to the next setting screen. Press
Escape
to cancel the new selection and return to the normal
display. The next interface screen appears as a prompt for the IEEE-488 terminators.
Se l e c t Wi t h ° ®
I EEE Te r ms Cr L f
Use the
or
key to select one of the following terminators: CR/LF, LF/CR, LF, and EOI. The default is Cr Lf. Press
Enter
to accept the new selection and return to the normal display. Press
Escape
to cancel the new selection and return
to the normal display.
6.1.2
Remote/Local Operation
Normal operations from the keypad are referred to as ‘Local’ operations. The Model 475 can also be configured for
‘Remote’ operations via the IEEE-488 interface or the
Local
key. The
Local
key will toggle between ‘Remote’ and
‘Local’ operations. During ‘Remote’ operations, the Remote LED annunciator will light and operations from the keypad
will be disabled.
6.1.3
IEEE-488 Command Structure
The Model 475 supports several command types. These commands are divided into three groups.
1.
Bus Control
– Refer to Paragraph 6.1.3.1.
a. Universal
(1) Uniline
(2) Multiline
b. Addressed Bus Control
2.
Common
– Refer to Paragraph 6.1.3.2.
3.
Device Specific
– Refer to Paragraph 6.1.3.3.
4.
Message Strings
– Refer to Paragraph 6.1.3.4.
6.1.3.1
Bus Control Commands
A Universal Command addresses all devices on the bus. Universal Commands include Uniline and Multiline Commands.
A Uniline Command (Message) asserts only a single signal line. The Model 475 recognizes two of these messages from
the BUS CONTROLLER:
Remote (REN)
and
Interface Clear (IFC)
. The Model 475 sends one Uniline Command:
Service Request (SRQ)
.
REN (Remote)
– Puts the Model 475 into remote mode.
IFC (Interface Clear)
– Stops current operation on the bus.
SRQ (Service Request)
– Tells the bus controller that the Model 475 needs interface service, see Paragraph 6.1.4.
