Gpib; Digital-I/O - Keithley 7002 Instruction Manual

4.12.2 GPIB

The GPIB menu is used for the following operations:
• Check and/or change the address of the IEEE-488 bus.
• Display the status byte of the IEEE-488 bus.
Perform the following steps to display the GPIB menu:
1. Press MENU to display the MAIN MENU.
2. Use the cursor keys (
GPIB, and press ENTER to display the following menu:
GPIB SETUP MENU
ADDRESS STATUS
ADDRESS — Use this menu item to check and/or change
the IEEE-488 address. At the factory the address is set to 7,
but it can be changed to any value from 0 to 30. To select AD-
DRESS, place the cursor on ADDRESS and press ENTER.
If the address is currently set to 7, the following message will
be displayed:
ADDRESS = 07 (0-30)
1. To retain the displayed address, press ENTER or EXIT.
The instrument will return to the GPIB SETUP MENU.
2. To change the address, simply key in a valid value (0 to
30) and press ENTER. The instrument will return to the
GPIB SETUP MENU.
NOTE
There is an IEEE-488 address switch
located on the rear panel of the unit. This
switch is used to set the IEEE-488 address
on specially built units that do not have
front panel controls and is explained in
paragraph 5.3. For units that do have front
panel controls, the switch is non-
functional.
STATUS  Use this menu item to display the IEEE-488
status byte. Refer to Section 5 (IEEE-488 Reference) for in-
formation on the status byte. To select STATUS, place the
cursor on STATUS and press ENTER. If for example, all bits
and ) to place the cursor on
of the status byte are reset to zero, it will be displayed as fol-
lows:
SHOW STATUS BYTE
EVA = 0 QSB = 0 MAV = 0 ESB = 0
MSS = 0 OSB = 0
When finished viewing the status byte, press either ENTER
or EXIT. The instrument will return to the GPIB SETUP
MENU.
NOTE
When finished with GPIB, use EXIT to
back out of the menu structure.

4.12.3 DIGITAL-I/O

The DIGITAL-I/O menu is used to configure the Model
7002's digital I/O port (refer to paragraph 4.15). Perform the
following operations through this menu:
• Check and/or change the OUTPUT-STATUS (on or off)
of the four digital output channels.
• Check and/or change the OUTPUT-POLARITY of the
digital output port. Polarity can be active-high (ON =
+5V) or active-low (ON = 0V).
• Check the INPUT-STATUS (on or off) of the single dig-
ital input channel.
NOTE
The digital output port can be used as a
sink in order to control external circuits
(i.e., low power relay drive) that use up to
30V. See paragraph 4.15.1 for details.
Perform the following steps to display the DIGITAL-I/O
MENU:
1. Press MENU to display the MAIN MENU.
2. Use the cursor keys (
DIGITAL-I/O and press ENTER to access the following
menu:
DIGITAL-I/O MENU
OUTPUT-STATUS OUTPUT-POLARITY
INPUT-STATUS
Front Panel Operation
and ) to place the cursor on
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