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Section 10: Limits, digital I/O, and scanning
Digital I/O
Digital I/O menu
Access the DIGOUT menu as follows:
1. From the main menu, select GENERAL (see
2. Use the cursor keys to highlight DIGOUT, and press ENTER. The following is displayed:
DIGOUT
STATE LOGIC-SENSE
DIGOUT menu items
The DIGOUT menu is used to configure the following operations:
Check or change the STATE (ON or OFF) of the four digital output lines
Check or change the LOGIC-SENSE of the digital output lines; the logic sense can be active-high
(ON = +5V) or active-low (ON = 0V).
STATE: Use this menu item to check or change the state (ON or OFF) of the four digital output lines.
The actual level of an "on" line is determined by the sense, which is controlled by the next menu item
(LOGIC-SENSE).
The state (ON or OFF) of a digital output line is changed by placing the cursor on the desired line and
pressing the manual RANGE keys. These keys simply toggle the state. With the lines configured as
desired, press ENTER.
LOGIC-SENSE: Use this menu item to check or change the sense of the digital output lines. The
sense of each line can be active-high (ON = +5V) or active-low (ON = 0V). When LOGIC-SENSE is
selected, you are be prompted to select the desired output line:
TTL1, TTL2, TTL3, or TTL4: Selects the digital output line and displays the following options:
ACTIVE-HIGH: Use this option to set the sense of the selected output line to active-high.
ACTIVE-LOW: Use this option to set the sense of the selected output line to active-low.
To check or change output sense, place the cursor on the appropriate line and press ENTER. Cursor
position indicates the present logic sense for the selected line (ACTIVE-HIGH or ACTIVE-LOW). To
change the sense, place the cursor on the alternate selection and press ENTER.
10-6
Model 6517B Electrometer Reference Manual
Menu
(on page 2-18) for more information).
6517B-901-01 Rev. C / August 2015
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