Page 1
GOT115-319
All-in-One
15” XGA TFT Fanless Touch Panel
Computer with Intel® Celeron®
Processor N3350 onboard or Intel®
Pentium® Processor N4200
User’s Manual
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Disclaimers
This manual has been carefully checked and believed to contain accurate information.
Axiomtek Co., Ltd. assumes no responsibility for any infringements of patents or rights of any
third party, and any liability arising from such use.
Axiomtek does not warrant or assume any legal liability or responsibility for the accuracy,
completeness or usefulness of any information in this document. Axiomtek does not make any
commitment to update the information in this manual.
Axiomtek reserves the right to change or revise this document and/or product at any time
without notice.
No part of this document may be reproduced, stored in a retrieval system, or transmitted, in
any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
without the prior written permission of Axiomtek Co., Ltd.
CAUTION
Wrong type of batteries may cause explosion. It is recommended that users only replace with
the same or equivalent type of batteries as suggested by the manufacturer once properly
disposing of any used ones.
Copyright 2019 Axiomtek Co., Ltd.
All Rights Reserved
December 2019, Version A1
Printed in Taiwan
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Safety Precautions
Before getting started, read the following important precautions.
1. Be sure to ground yourself to prevent static charge when installing the internal
components. Use a grounding wrist strap and place all electronic components in any
static-shielded devices. Most electronic components are sensitive to static electrical
charge.
2. Disconnect all power cords from the GOT115-319 Series before making any installation.
Be sure both the system and the external devices are turned OFF. Sudden surge of
power could ruin sensitive components. Make sure the GOT115-319 series is properly
grounded.
3. Do not open the top cover of the system. If opening the cover for maintenance is a must,
only a trained technician is allowed to do so. Integrated circuits on computer boards are
sensitive to static electricity. To avoid damaging chips from electrostatic discharge,
observe the following precautions:
Before handling a board or integrated circuit, touch an unpainted portion of the
system unit chassis for a few seconds. This will help to discharge any static
electricity on your body.
When handling boards and components, wear a grounding wrist strap, available
from most electronic component stores.
Trademark Acknowledgments
Axiomtek is a trademark of Axiomtek Co., Ltd.
Windows® is a trademark of Microsoft Corporation.
IBM, PC/AT, PS/2, VGA are trademarks of International Business Machines Corporation.
Intel® and Pentium® are trademarks of Intel Corporation.
AMI is a trademark of American Megatrend Inc.
Other brand names and trademarks are the properties and registered brands of their
respective owners.
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Table of Contents
Disclaimers ..................................................................................................... ii
Safety Precautions ........................................................................................ iii
Chapter 1 Introduction ............................................. 1
1.1 General Description ............................................................................ 1
1.2 GOT115-319 Specifications ................................................................ 2
1.2.1 Main CPU Board .................................................................................................. 2
1.2.2 I/O System ........................................................................................................... 2
1.2.3 System Specifications .......................................................................................... 3
1.3 Dimensions .......................................................................................... 4
1.4 I/O Outlets ............................................................................................ 5
1.5 Packing List ......................................................................................... 6
Chapter 2 Hardware and Installation ...................... 7
2.1 Jumper and Connector Settings ........................................................ 7
2.1.1 Jumper Settings ................................................................................................... 8
2.1.2 Connector Settings .............................................................................................. 9
2.2 Mountings – Panel/Wall/Desktop/VESA .......................................... 13
2.2.1 Panel-Mounting (optional) ................................................................................. 13
2.2.2 Assembling the Wall Mount Bracket .................................................................. 14
2.2.3 Assembling the stand ........................................................................................ 15
2.3 Storage Installation ........................................................................... 16
2.3.1 mSATA Installation ............................................................................................. 16
2.3.2 MicroSD Card Installation .................................................................................. 17
2.3.3 HDD Installation ................................................................................................. 18
2.4 DRAM Installation .............................................................................. 20
2.5 M.2 Wireless Card Installation .......................................................... 21
2.6 Power Input (DC cable) ..................................................................... 22
Chapter 3 AMI BIOS Setup Utility .......................... 23
3.1 Navigation Keys ................................................................................ 23
3.2 Main Menu .......................................................................................... 24
3.3 Advanced Menu ................................................................................. 25
3.3.1 Serial Port Configuration ................................................................................... 26
3.3.2 Hardware Monitor .............................................................................................. 27
3.3.3 ACPI Settings .................................................................................................... 28
3.3.4 CPU Configuration ............................................................................................. 29
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3.3.5 SATA Configuration ............................................................................................ 30
3.3.6 USB Configuration ............................................................................................. 31
3.4 Chipset Menu ..................................................................................... 32
3.4.1 North Bridge....................................................................................................... 33
3.4.2 South Bridge ...................................................................................................... 34
3.5 Security Menu .................................................................................... 35
3.6 Boot Menu .......................................................................................... 36
3.7 Save & Exit Menu .............................................................................. 37
Chapter 4 Drivers Installation .............................. 39
4.1 System ............................................................................................... 39
4.1.1 Windows 10 ....................................................................................................... 39
4.2 Touch Screen ................................................................ ..................... 39
Appendix A Watchdog Timer & DIO Programming ... 41
About Watchdog Timer ................................................................................ 41
How to Use Watchdog Timer ....................................................................... 41
WDT Sample Program ................................................................................. 43
How to Use DIO Software Programming ................................ .................... 43
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GOT115-319 User’s Manual
Chapter 1
Introduction
Chapter 1 contains general information and detailed specification of the GOT115-319, which
includes the following sections:
General Description
Specifications
Dimensions
I/O Outlets
Package List
1.1 General Description
GOT115-319 is a fanless and compact-size touch panel computer, equipped with a 15” TFT
LCD display and low power consumption processor, Intel® Celeron® Processor N3350 (with
2M cache, up to 2.4 GHz) or Intel® Pentium® Processor N4200 (with 2M Cache, up to 2.5
GHz). It is compatible with Windows 10 and supports one mSATA for storage and one M.2 card
slot for wireless connection. It has excellent ID design and friendly user interface which make it
a professional yet easy-to-use panel computer. The GOT115-319 is an ideal model for
applications with limited spaces in factory automation, building automation and more.
GOT115-319: 15” TFT XGA Fanless Touch Panel Computer
Reliable and stable design
GOT115-319 adopts a fanless cooling system which makes it suitable for harsh
environments susceptible to dust, vibration, etc.
Embedded O.S. supported
GOT115-319 supports not only Windows 10 (64bit), but also embedded O.S. In terms of
storage device, it supports one mSATA SSD.
Industrial-grade product design
GOT115-319 is adaptively designed to be used in different industrial environments. It
comes with an IP65-rated front panel and IPX1 water ingress protection for the whole
enclosure.
For connecting other devices, GOT115-319 also has several IO interfaces: USB,
Ethernet and RS-232/422/485.
Introduction 1
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1.2 GOT115-319 Specifications
1.2.1 Main CPU Board
CPU
Intel® Celeron® Dual Core Processor N3350 (2M Cache, up to 2.4 GHz) onboard.
Intel® Pentium® Quad Core Processor N4200 (2M Cache, up to 2.5 GHz) onboard.
System memory
1x 204-pin DDR3L-1600 SO-DIMM socket
Up to 8 GB Max.
BIOS
American Megatrends BIOS
1.2.2 I/O System
Standard I/O
1x RS-232/422/485
1x RS-232
2x USB 3.0
2x USB 2.0
Ethernet
2x RJ45 Giga Ethernet
Expansion
1x M.2(E Key) slot for wireless module
Audio
2x internal 2W Speaker
1x Line out
Built-in microphone (on the bottom side of the front panel)
Storage
1x mSATA
1x MicroSD Card slot
1x 2.5” SATA HDD/SSD
Power connector
GOT115-319 DC : 9~24 VDC power input with cable for screw type connector to DC
source for 9~24V DC
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1.2.3 System Specifications
15” XGA (1024 x 768) LCD with LED backlight
Projected capacitive multi-touch or 5 wired resistive touch
Fanless heat dissipation design
Disk drive housing
1x mSATA
1x MicroSD card slot
1x 2.5” SATA HDD/SSD
Net weight
3.2kg
Dimension (main body size)
329 mm (W) x 306 mm (H) x 50.0 mm (D)
Operation temperature
0℃ to 50℃
Relative humidity
10% to 90% @ 40℃, -non-condensing
Vibration
2.0 G, 5 to 500 Hz, random (with SSD or mSATA storage)
Power input
Optional External 12V 60W AC adapter
— Power input: 100 to 240 VAC
— Power output: 12 VDC, Max. 5A
Cable for screw type connector to DC source for 9~24V DC
NOTE All specifications and images are subject to change without notice.
Introduction 3
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GOT115-319 User’s Manual
1.3 Dimensions
GOT115-319 outlines and dimensions
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1.4 I/O Outlets
Please refer to Figures 1-1 and 1-2 for controls and I/O locations at the bottom of the
GOT115-319.
Figure 1-1 Front view of the GOT115-319
Figure 1-2 Bottom view and back view of the GOT115-319
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1.5 Packing List
Accessories package of the GOT115-319 should contain the following items:
GOT115-319 x 1
DC cable (GOT115-319-DC)
M3 Screw for M.2 card slot
M2 screw for mSATA card slot
Adapter x 1 (Optional)
Please contact an Axiomtek distributor immediately if any item is missing.
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Chapter 2
Hardware and Installation
The GOT115-319 provides rich I/O ports and flexible expansions for users to meet different
demands. This section is describing hardware installation, including the following subsections:
Jumper and Connector Settings
Port Definitions
Hardware Installation
Mounting Methods
Connecting the Power Input
2.1 Jumper and Connector Settings
Diagram 2-1 Component side of the board
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Jumper
★ Default Setting
Jumper Setting
JP3
★ Normal
Clear CMOS
Short 1-2
Short 2-3
JP2
★ LVDS Panel Power : 3.3V
LVDS Panel Power : 5V
Short 1-2
Short 2-3
Diagram 2-2 Solder side of the board
2.1.1 Jumper Settings
By making proper jumper settings, users can configure the board SBC87319 to suit the needs
of their applications.
Table 2-1 shows the default jumper settings for the SBC87319.
Table 2-1 Default jumper settings
NOTE: Items marked with ★ are for default settings.
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Label
Connectors
CN4
Speaker connector
CN5
SIM socket
CN7
Mini PCI-Express Card socket or mSATA
CN11
USB2.0 connector (optional with touch controller)
CN15
USB2.0 connector
CN17
DIO connector
CN19
M.2 E key 2230 type
CN23
USB3.0 connector
CN24
Power DC in connector
SW1
Power button
LAN1/LAN2
Ethernet connector
COM1
COM Port connector
COM2
COM Port connector
SW2
AT/ATX switch
SCN1
SD card connector
2.1.2 Connector Settings
The connectors on the CPU board allow the CPU board to connect with other parts of the
system. Ensure that all connectors are in place and firmly attached. Table 2-2 lists the function
of each connector on the board SBC87319.
Table 2-2 Connector Settings
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Pin
Description
1
SPKOUT_L+
2
SPKOUT_L-
3
SPKOUT_R+
4
SPKOUT_R-
5
GND
Pin
Description
1
USB Power
2
D-
3
D+ 4 GND
5
GND
Pin
Description
Pin
Description
1
USB2_PWR
2
USB2_PWR
3
USB_DN
4
USB_DN
5
USB_DP
6
USB_DP
7
GND
8
GND
9
GND
10
GND
Speaker connector: CN4
USB2.0 connector: CN11
USB2.0 connector: CN15
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Pin
Description
Pin
Description
1
+5V 2 +5V 3 GPIO1
4
GPIO2
5
GPIO3
6
GPIO4
7
GPIO5
8
GPIO6
9
GPIO7
10
GPIO8
11
GND
12
GND
Pin
RS232
[*]
RS422
[*]
RS485
[*]
1
DCD#
TX-
485-
2
RXD
TX+
485+
3
TXD
RX+
NC
4
DTR#
RX-
NC
5
GND
GND
GND
6
DSR#
NC
NC
7
RTS#
NC
NC
8
CTS#
NC
NC
9
RI#
[**]
NC
NC
DIO connector: CN17
COM Port connector: COM1
GOT115-319 User’s Manual
[*]: Signals of COM1 can be RS-232/422/485 by selecting BIOS table.
[**]: Pin 9 of COM1 can be RI/5V/12V by selecting BIOS table.
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Pin
RS232
1
DCD#
2
RXD
3
TXD
4
DTR#
5
GND
6
DSR#
7
RTS#
8
CTS#
9
RI#
Pin
Description
1
Disable auto power on (default)
2
Enable auto power on
COM Port connector: COM2
AT/ATX switch: SW2
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2.2 Mountings – Panel/Wall/Desktop/VESA
There are several ways to mount the GOT115-319: Wall, desktop, VESA and panel mounting.
2.2.1 Panel-Mounting (optional)
The GOT115-319 is designed for panel mount application.
Step1 Sticks four sealing pads on the edges of the chassis.
Step2 Assemble the panel kit onto the chassis and fasten the five screws.
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2.2.2 Assembling the Wall Mount Bracket
The GOT115-319 provides a wall mount bracket (VESA 100 x 100 mm). Screw four screws to
fix the kit in the back chassis.
Step 1 Find out the screw holes to assemble the wall mount bracket on the back side
of the chassis with four screws.
Wall-Mount Bracket Dimension
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2.2.3 Assembling the stand
The GOT115-319 supports VESA mount: 100 x 100 mm. Screw four screws to fix the stand kit
in the back chassis.
Find out the screw holes to assemble the stand kit with four screws, as shown by the
red marks in the below picture.
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2.3 Storage Installation
2.3.1 mSATA Installation
The GOT115-319 provides a Mini Card slot for users to install mSATA. Please refer to the
following instructions for installation:
Step 1 Turn off the system, and unplug the power cord.
Step 2 Unscrew and remove the back cover.
Step 3 Locate the Mini Card slot on the main board.
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Step 4 Insert the mSATA card into the Mini Card slot. Screw it firmly on the slot.
NOTE The type of screws used for the Mini Card slot is M2.
2.3.2 MicroSD Card Installation
The GOT115-319 provides one MicroSD card slot for users to install a MicroSD card.
Step 1 Push the MicroSD card into the slot until it has been locked firmly.
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2.3.3 HDD Installation
The GOT115-319 support one 2.5” SATA HDD/SSD. Please refer to the following instructions
for installation:
Step 1 Turn off the system, and unplug the power cord.
Step 2 Unscrew and remove the back cover.
Step 3 Find out the HDD bracket beside the main board.
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Step 4 Attach the HDD/SSD to the bracket: Tighten screws on the rear of the HDD
bracket. Then insert SATA cable and screw the HDD bracket to enclosure.
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2.4 DRAM Installation
The GOT115-319 provides one 204-pin DDR3L SODIMM socket that supports system memory
up to 8GB. Please follow steps below to install the memory modules:
Step 1 Insert the DRAM into the DIMM socket, and then push it down firmly until it is
clipped by the socket.
Step 2 Rip off the mylar from the thermal pad on the back cover of enclosure.
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2.5 M.2 Wireless Card Installation
The GOT115-319 supports one M.2 slot for wireless module (option) installation. Please find
instructions as follows:
Step 1 Open the back cover and locate the M.2 card slot on the main board in the
marked area below.
Step 2 Insert the M.2 wireless card into the M.2 slot as shown in the red mark area.
Step 3 Screw the card firmly on the slot and connect the antenna cable, as shown in
the red mark area.
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Pin
Description
Color
1
+: Power positive
White
2
－:Power negative
Black
2.6 Power Input (DC cable)
Axiomtek provides a cable for the DC jack connector to connect to a DC source. It adopts
9~24VDC. Please follow the signs on the power connector to connect to a DC power source.
NOTE The safety ground must be connected to ensure proper operation of the unit.
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Hot Keys
Descriptions
<> and <>
Left/Right
The <> and <> keys are used to select a setup screen.
<> and <>
Up/Down
The <> and <> keys are used to select a setup screen or
sub-screen.
<+> and <>
Plus/Minus
The <+> and <> keys are used to change the field value of a
particular setup item.
<Tab>
The <Tab> key is used to select setup fields.
<F1>
The <F1> key is used to display the general help screen.
<F2>
The <F2> key is used to load previous values.
<F3>
The <F3> key is used to load optimized defaults.
<F4>
The <F4> key is used to save any changes made then exit the setup.
Press the <F4> key to save any changes.
<Esc>
The <Esc> key is used to discard any changes made then exit the
setup. Press the <Esc> key to exit the setup without saving your
changes.
<Enter>
The <Enter> key is used to display or change the setup option listed
for a particular setup item. The <Enter> key is also used to display
the setup sub- screens.
Chapter 3
AMI BIOS Setup Utility
This section provides users with detailed descriptions about how to set up basic system
configuration through the AMI BIOS setup utility.
3.1 Navigation Keys
The BIOS setup/utility uses a key-based navigation system called hot keys. Most of the BIOS
setup utility hot keys can be used at any time during the setup navigation process.
These keys include <F1>, <F2>, <F3>, <F4>, <Enter>, <ESC>, arrow keys, etc. (as listed in
Table 3-1).
NOTE: Some of the navigation keys may differ from one screen to another.
Table 3-1 Descriptions of hot keys
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3.2 Main Menu
Figure 3-1 Main menu
System Time/Date
Use this option to change the system time and date. Highlight System Time or System Date
using the up/ down/ left and right arrow keys (see Figure 3-1). Enter new values through the
keyboard. Press the <Tab> key or the arrow keys to move between fields. The date entered
must be in MM/DD/YY format. The time is entered in HH:MM:SS format.
24 AMI BIOS Setup Utility
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3.3 Advanced Menu
Figure 3-2 Advanced menu
GOT115-319 User’s Manual
The Advanced menu allows users to set configurations of the CPU and other system devices.
Select any item on the left to go to the sub-menus (as shown in Figure 3-2).
► Serial Port Configuration
► Hardware Monitor
► ACPI Settings
► CPU Configuration
► SATA Configuration
► USB Configuration
Simply highlight the item of choice, then press <Enter> to go to sub-menus for more specific
options.
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3.3.1 Serial Port Configuration
► Serial Port 1 Configuration (COM1)
► Serial Port 2 Configuration (COM2)
Serial port
This option is used to enable or disable serial port COM1/COM2.
Device Setting
This item specifies the base I/O port address and Interrupt Request (IRQ) address of a serial
port.
Optimal setting for Port 1 is [3F8h/IRQ4].
Optimal setting for Port 2 is [2F8h/IRQ5].
COM 1 Port Type
Serial Port 1 Configuration is used to select COM Port Type: [RS-232] or [RS-422] or
[RS-485].
COM1 RI Setting is used to select COM Port Type: [RI] or [5V] or [+12V]
Figure 3-3 ‘Serial Port Configuration’ -> ‘COM Port Type’
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3.3.2 Hardware Monitor
Figure 3-4 shows a screen reflecting the ‘PC Health Status’ of the hardware in real time.
Figure 3-4 Entering ‘Hardware Monitor’
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3.3.3 ACPI Settings
This screen is used to select options of the ACPI Configuration, and then change the value of
the selected option. A description of the selected item appears on the right side of the screen.
ACPI Sleep State
This item allows users to select the Advanced Configuration and Power Interface (ACPI) state
to be used for system suspension. There are two choices under this selection: [Suspend
Disable] or [S3 (Suspend to RAM)] (as shown in Figure 3-5).
Figure 3-5 Entering ‘ACPI Settings’
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GOT115-319 User’s Manual
3.3.4 CPU Configuration
Figure 3-6 shows a page of CPU configuration with the item Intel Virtualization Technology
highlighted for [Enabled] or [Disabled].
Figure 3-6 Entering ‘CPU Configuration’
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GOT115-319 User’s Manual
3.3.5 SATA Configuration
This screen allows users to select options for SATA Configuration, and then change the value
of the selected option (see Figure 3-7).
SATA Controller
Highlight Chipset SATA to set up SATA Controller to be [Enable] or [Disable].
Highlight PCIE/mSATA to set up PCIE/mSATA Mini Card Configuration, Here are the options
for the selection of PCIe and mSATA
Figure 3-7 Entering ‘SATA Configuration’
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GOT115-319 User’s Manual
3.3.6 USB Configuration
Please see Figure 3-8 to find out what items can be set up under the page of USB
Configuration.
Figure 3-8 Entering ‘USB Configuration’
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3.4 Chipset Menu
The Chipset menu gives memory information about the North Bridge and South Bridge (see
Figure 3-9).
Figure 3-9 Chipset menu
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3.4.1 North Bridge
North Bridge memory information is shown in Figure 3-10.
Figure 3-10 Entering ‘North Bridge’
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3.4.2 South Bridge
South Bridge TXE information is shown in Figure 3-11.
Figure 3-11 Entering ‘South Bridge’
34 AMI BIOS Setup Utility
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3.5 Security Menu
You may set the administrator/user password for the system.
Figure 3-12 Security Menu
GOT115-319 User’s Manual
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3.6 Boot Menu
The Boot menu allows users to change boot options of the system. Users can highlight any of
the items on the left frame of the screen to go to any particular sub menus (as shown in Figure
3-13).
Figure 3-13 Boot Menu
Setup Prompt Timeout
Enter a numeric value here as the length for timeout.
Bootup NumLock State
Use this item to select the power-on state for the NumLock. The default setting is [On].
Quiet Boot
Use this item to enable or disable the Quite Boot state. The default setting is [Disabled].
Launch UEFI PXE OpROM policy
Use this item to enable or disable the Pre-boot Execution Environment (PXE) under UEFI
mode. The default setting is [Disabled].
Boot Option Priorities
Use this item to specify the overall boot order among the available devices.
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3.7 Save & Exit Menu
Figure 3-14 Save & Exit Menu
GOT115-319 User’s Manual
Save Changes and Exit
When users have completed the system configuration changes, select this option to leave
Setup and return to Main Menu. Select Save Changes and Exit from the Save & Exit menu and
press <Enter>. Select Yes to save changes and exit.
Discard Changes and Exit
Select this option to quit Setup without making any permanent changes to the system
configurations and return to Main Menu. Select Discard Changes and Exit from the Save & Exit
menu and press <Enter>. Select Yes to discard changes and exit.
Save Changes and Reset
When users have completed the system configuration changes, select this option to leave
Setup and reboot the computer so the new system configurations take effect. Select Save
Changes and Reset from the Save & Exit menu and press <Enter>. Select Yes to save
changes and reset.
Discard Changes and Reset
Select this option to quit Setup without making any permanent changes to the system
configuration and reboot the computer. Select Discard Changes and Reset from the Save &
Exit menu and press <Enter>. Select Yes to discard changes and reset.
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Save Changes
After completing the system configuration changes, select this option to save changes. Select
Save Changes from the Save & Exit menu and press <Enter>. Select Yes to save changes.
Discard Changes
Select this option to quit Setup without making any permanent changes to the system
configurations. Select Discard Changes from the Save & Exit menu and press <Enter>. Select
Yes to discard changes.
Restore Defaults
It automatically sets all Setup options to a complete set of default settings when users select
this option. Select Restore Defaults from the Save & Exit menu and press <Enter>.
Save as User Defaults
Select this option to save system configuration changes done so far as User Defaults. Select
Save as User Defaults from the Save & Exit menu and press <Enter>.
Restore User Defaults
It automatically sets all Setup options to a complete set of User Defaults when users select this
option. Select Restore User Defaults from the Save & Exit menu and press <Enter>.
Boot Override
Select a drive to immediately boot that device regardless of the current boot order.
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Touch Screen
5-wired analog resistive touch
Touch Screen Controller
Penmount 6000 USB touch Screen Controller IC
Communications
USB interface
Resolution
1024 x 1024 resolution
Power Input
5V
Power Consumption
Active: 24.6mA / Idle Mode: 13.4mA
Input Method
Finger or Cap.Stylus
Calibration
Non-Calibration
Chapter 4
Drivers Installation
4.1 System
The GOT115-319 supports Windows 10 pro and Windows 10 IoT Enterprise. To facilitate the
installation of the system driver, please carefully read the instructions in this chapter before
installation.
4.1.1 Windows 10
1. Insert the driver CD and select the folders from step 1 to step 5.
2. Copy all folders onto the system storage.
3. Click the setup.exe file in each folder and follow the instructions to complete installation.
4.2 Touch Screen
The GOT115-319 adopts a projected capacitive multi-touch screen or 5-wired analog resistive
touch. The specification is listed in Table 4-1 below. The touch driver will be installed
automatically to enable the touch panel’s two-finger touch functions based on the Windows 10
and Windows IoT Enterprise support.
Table 4-1 Touch screen specification
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Touch Screen
Projected Capacitive Multi-touch
Touch Screen Controller
COF
Communications
USB interface
Resolution
4096 x 4096 resolution
Power Input
5V
Power Consumption
Active: <100mA / Idle Mode: 50mA
Input Method
Finger or Cap.Stylus
Calibration
Non-Calibration
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Appendix A
Watchdog Timer & DIO
Programming
About Watchdog Timer
Software stability is a major issue in most applications. Some embedded systems are not
watched by humans for 24 hours. It is usually too slow to wait for someone to reboot when a
computer hangs. The system needs to be able to reset automatically when things go wrong.
The watchdog timer gives us that solution.
The watchdog timer is a counter that triggers a system reset when it counts down to zero from
a preset value. The software starts the counter with an initial value and must reset it
periodically. If the counter ever reaches zero which means the software has crashed, the
system will reboot.
How to Use Watchdog Timer
The I/O port base addresses of the watchdog timer are 2E (hex) and 2F (hex). The 2E (hex)
and 2F (hex) are address and data port respectively.
Assume that program A is put in a loop that must execute at least once every 10ms. Initialize
the watchdog timer with a value bigger than 10ms. If the software has no problems, the
watchdog timer will never expire because software will always restart the counter before it
reaches zero.
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Begin
Enable and Initialize
Watchdog Timer
Program “A”
Disable Watchdog
Timer
Next
Next
Next
Next
Begin
Enable and Initialize
Watchdog Timer
Program “A”
Reset Watchdog
Timer
Next
Next
Next
Next
42 Watchdog Timer & DIO Programming
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WDT Sample Program
Enable WDT
1.Enable configuration:
-O 2E 87
-O 2E 87
2. Select Logic device:
-O 2E 07
-O 2F 07
3. WDT device enable:
-O 2E FA
-O 2F 01
4. Set base timer:
-O 2E F6
-O 2F 0A Set reset time (Ex.0A:10 Sec/Minute)
5. Set timer unit (bit[3]=0: Sec; bit[3]=1: Minute):
Enable watchdog time counting (bit5=1)
-O 2E F5
-O 2F 20 (Set timer unit to sec and enable counting)
GOT115-319 User’s Manual
How to Use DIO Software Programming
Digital I/O Software Programming
I2C to GPIO PCA9535PW GPIO
I2C address: 0b01000100.
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44 Watchdog Timer & DIO Programming
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