B: gpi/o p, Ppendix, Rogramming – NEXCOM APPC 1220T User Manual
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Appendix B: GPI/O Programming Guide
APPC 1220T/1221T/1520T/1521T/1720T/1721T User Manual
a
PPendix
B: gPi/o P
rogramming
g
uide
GPI/O (General Purpose Input/Output) pins are provided for custom system
design. This appendix provides definitions and default settings for the ten
GPI/O pins in the APPC series. The pin definition is shown in the following
table:
J9 - GPIO Connector
Pin GPI/O
Mode
PowerOn
Default
Address Pin GPI/O
Mode
PowerOn
Default
Address
1
VCC
-
-
2
GND
-
-
3
GPO
Low
284h
(Bit4)
4
GPI
High
284h
(Bit0)
5
GPO
Low
284h
(Bit5)
6
GPI
High
284h
(Bit1)
7
GPO
Low
284h
(Bit6)
8
GPI
High
284h
(Bit2)
9
GPO
Low
284h
(Bit7)
10
GPI
High
284h
(Bit3)
Control the GPO pin (3/5/7/9) level from I/O port 284h bit (4/5/6/7).
The bit Set/Clear indicates output High/Low.
Pin
Definition
Pin
Definition
1
+5V
2
GND
3
GPIO24 (GPO)
4
GPIO20 (GPI)
5
GPIO25 (GPO)
6
GPIO21 (GPI)
7
GPIO26 (GPO)
8
GPIO22 (GPI)
9
GPIO27 (GPO)
10
GPIO23 (GPI)