Table of Contents
Advertisement
Chapter 6
Digital I/O Features
TEMPpoint, VOLTpoint, and MEASURpoint instruments provide 8 digital input lines and 8
digital output lines that you can use to control external equipment, including solid-state or
mechanical relays.
This section describes the following digital I/O features:
• Digital input lines, described below
• Digital output lines, described on
• Channel-to-channel isolation, described on
• Resolution, described on
• Operation modes, described on
Digital Input Lines
TEMPpoint, VOLTpoint, and MEASURpoint instruments feature eight, isolated, digital input
lines.
Digital inputs operate from +3 to +28 V DC, with a switching time of 2 ms maximum.
30
shows the digital input circuitry; a 2.2 kΩ resistor is used in series with the LED in the
opto-isolator input.
A digital line is high (switch is closed) if its value is 1; a digital line is low (switch is open) if its
value is 0.
96
page 97
page 97
page 97
page 97
2.2K
+
Digital Input
-
1 of 8 Opto-Isolators
Figure 30: Digital Input Circuitry
Figure
Advertisement
Table of Contents
