USBIO24 ELEXOL, USBIO24 Datasheet - Page 6

• Manufacturer Part Number: USBIO24
• Description: DIGITAL I/O MODULE, USB TO 24 I/O
• Manufacturer: ELEXOL
• Type: USB I/O Moduler

Specifications of USBIO24

• Development Tool Type: Digital I/O Module
• Tool / Board Application: Digital Signal Transfer
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

USB I/O 24 R Datasheet
The Pull Up configuration applies to those lines that are set as inputs, writing a 0 to the
corresponding bit applies a pull up resistor to the line so that if it is not driven low it will be pulled
to a known high state, this is very useful if sensing contact closures or open collector outputs
Threshold
The threshold function sets the threshold at which a line reads as high or low. When the
corresponding bit is set as 1 then the threshold is set at 1.4V and any voltage above this reads as a
high level. When the corresponding threshold bit is set to 0 the threshold is set at 2.5V and any
voltage above this reads as a high level.
Schmitt
Schmitt trigger inputs means that the input line is compared to 2 voltages, 0.75V and 4.25V. When
the line’s voltage drops below 0.75V it will read as a low until the line’s voltage rises above 4.25V
at which time the line will read as a high. When the line’s voltage is in between 0.75V and 4.25V,
the value will remain stable at its previous level. To enable the Schmitt trigger on any input a 0
must be written to the corresponding bit
Mode 2 Functional Changes
All reads have a port designator (‘a’, ’b’ or ’c’) before the data.
All auto sends have a port designator (‘a’, ’b’ or ’c’) before the data.
All writes to the port that change the port will results in a port data auto send.
Elexol Pty Ltd
Version 1.1
Page 6
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