Pc 5173, B. digital i/o interface, B.1 introduction – Acnodes PC 5173 User Manual
Page 91: B.2 dio connector pinouts, B.3 assembly language samples
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please visit Acnodes’ web site at www.acnodes.com.
PC 5173
17” Industrial wireless Panel PC
B. DIGITAL I/O INTERFACE
B.1 INTRODUCTION
The DIO connector on the PC5153/ PC5173 is interfaced to GPIO ports on the Super I/O chipset. The
DIO has both 4-bit digital inputs and 4-bit digital outputs. The digital inputs and digital outputs are
generally control signals that control the on/off circuit of external devices or TTL devices. Data can be
read or written to the selected address to enable the DIO functions.
NOTE:
For further information, please refer to the datasheet for the Super I/O chipset.
B.2 DIO CONNECTOR PINOUTS
The following table describes how the DIO connector pins are connected to the Super I/O.
B.3 ASSEMBLY LANGUAGE SAMPLES
B.3.1 ENABLE THE DIO INPUT FUNCTION
The BIOS interrupt call INT 15H controls the digital I/O. An assembly program to enable digital I/O input
functions is listed below.
MOV AX, 6F08H
Sets the digital port as input
INT
15H
Initiates the INT 15H BIOS call