Keithley 7001, Instruction Manual, Page: 75 / 353

Front Panel Operation
4-26
information on the status byte. To select STATUS, place
the cursor on STATUS and press ENTER. If for exam-
ple, all bits of the status byte are reset to zero, it will be
displayed as follows:
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.
4.6.3 DIGITAL-I/O
The DIGITAL-I/O menu is used for the following op-
erations:
• 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
digital input channel.
NOTE
The digital output port uses default
levels of 0V and +5V. However, a user
supplied voltage level of up to 30V can
be used instead of the 5V level (see
paragraph 4.9.1).
Perform the following steps to display the DIGITAL-I/
O MENU:
1. Display the MAIN MENU (see paragraph 4.6, Gen-
eral rule #1).
2. Use the cursor keys ( and ) to place the cursor
on DIGITAL-I/O and press ENTER to access the
following menu:
DIGITAL-I/O MENU
OUTPUT-STATUS OUTPUT-POLARITY
INPUT-STATUS
OUTPUT-STATUS

Use this menu item to check and/or
change the state (on or off) of the four digital output
channels. The actual level of an “on” channel is deter-
mined by the polarity, which is controlled by the next
menu item (OUTPUT-POLARITY). To select OUTPUT-
STATUS, place the cursor on OUTPUT-STATUS and
press ENTER. If for example, all the digital output
channels are off, the following message will be dis-
played:
DIGITAL OUTPUT LINES
1 = OFF 2 = OFF 3 = OFF 4 = OFF
1. To retain the displayed states of the output chan-
nels, press ENTER or EXIT. The instrument will re-
turn to the DIGITAL-I/O MENU.
2. To change the state of one or more digital output
channels, perform the following steps:
A. Position the cursor at the channel that you wish
to change.
B. Press any one of the keys on the keypad. These
keys simple toggle between “ON” and “OFF”.
C. Repeat steps A and B for each channel that you
wish to change.
D. With the desired states displayed, press EN-
TER. The instrument will return to the DIGI-
TAL-I/O MENU.
OUTPUT-POLARITY

Use this menu item to check and/
or change the polarity of the digital output port. The
polarity of each channel can be active-high (ON = +5V)
or active low (ON = 0V). To select OUTPUT-POLARI-
TY, place the cursor on OUTPUT-POLARITY and press
ENTER. The following message will be displayed:
SELECT OUTPUT LINE
TTL1 TTL2 TTL3 TTL4
1. Place the cursor on the appropriate channel and
press ENTER. A message indicating the polarity of
the selected channel will be displayed. For exam-
ple:
TTL1 LOGIC SENSE
ACTIVE-HIGH ACTIVE-LOW
Cursor position will indicate the polarity of the
channel.
2. To retain the currently selected polarity, press EN-
TER or EXIT. The display will return to the SE-
LECT OUTPUT LINE MENU.
3. To change polarity, place the cursor on the alter-
nate selection using the cursor keys ( or ) and
press ENTER. The instrument will return to the SE-
LECT OUTPUT LINE MENU.
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