Lake Shore 370, Руководство пользователя

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Lake Shore Model 370 AC Resistance Bridge User’s Manual
Changing IEEE-488 Interface Parameters (Continued)
To set the IEEE-488 parameters, press the
Computer 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.
Computer Interface
Select With °®
IEEE Address: 12
Use the
S
or
T
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 computer interface screen appears as a prompt for the IEEE-488 terminators.
Computer Interface
Select With °®
Term: Cr Lf
Use the S or T 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 continue to the next setting screen. 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 370 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 annunciator will appear in the upper right corner of the
display and operations from the keypad will be disabled.
6.1.3 IEEE-488 Command Structure
The Model 370 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 370 recognizes two of these messages from
the BUS CONTROLLER:
Remote (REN)
and
Interface Clear (IFC)
. The Model 370 sends one Uniline Command:
Service Request (SRQ)
.
REN (Remote)
– Puts the Model 370 into remote mode.
IFC (Interface Clear)
– Stops current operation on the bus.
SRQ (Service Request)
– Tells the bus controller that the Model 370 needs interface service.
6-2 Remote Operation