Lakeshore Learning Materials 642 - Manual (Page 54)

Lake Shore Model 642 Electromagnet Power Supply User’s Manual
5-2 Computer Interface Operation
5.1.1 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 5.3.
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 °®
IEEE 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.
5.1.2 Remote/Local Operation
Normal operations from the keypad are referred to as ‘Local’ operations. The Model 642 can also be configured for
‘Remote’ operations via the IEEE-488 interface or the Remote key. The Local key will take the instrument out of
‘Remote’ operation and place it in ‘Local’ operation. During ‘Remote’ operations, the Remote LED annunciator will be
illuminated and operations from the keypad will be disabled.
5.1.3 IEEE-488 Command Structure
The Model 642 supports several command types. These commands are divided into three groups.
1. Bus Control – Refer to Paragraph 5.1.3.1.
a. Universal
(1) Uniline
(2) Multiline
b. Addressed Bus Control
2. Common – Refer to Paragraph 5.1.3.2.
3. Device Specific – Refer to Paragraph 5.1.3.3.
4. Message Strings – Refer to Paragraph 5.1.3.4.