ASRock Industrial SOM-P104 User manual

SOM-P104
User Manual
Version 1.0
Published May 17, 2023
Copyright©2023 ASRockInd INC. All rights reserved.

Version 1.0
Published May, 2023
Copyright©2023 ASRockInd INC. All rights reserved.
Copyright Notice:
No part of this documentation may be reproduced, transcribed, transmitted, or
translated in any language, in any form or by any means, except duplication of
documentation by the purchaser for backup purpose, without written consent of
ASRockInd Inc.
Products and corporate names appearing in this documentation may or may not
be registered trademarks or copyrights of their respective companies, and are used
only for identication or explanation and to the owners’ benet, without intent to
infringe.
Disclaimer:
Specications and information contained in this documentation are furnished
for informational use only and subject to change without notice, and should
not be constructed as a commitment by ASRockInd. ASRockInd assumes no
responsibility for any errors or omissions that may appear in this documentation.
With respect to the contents of this documentation, ASRockInd does not provide
warranty of any kind, either expressed or implied, including but not limited to
the implied warranties or conditions of merchantability or tness for a particular
purpose.
In no event shall ASRockInd, its directors, ocers, employees, or agents be liable
for any indirect, special, incidental, or consequential damages (including damages
for loss of prots, loss of business, loss of data, interruption of business and the
like), even if ASRockInd has been advised of the possibility of such damages arising
from any defect or error in the documentation or product.
is device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
e terms HDMI®and HDMI High-Denition Multimedia Interface, and the HDMI
logo are trademarks or registered trademarks of HDMI Licensing LLC in the United
States and other countries.

WARNING
THIS PRODUCT CONTAINS A BUTTOON BATTERY
If swallowed, a button battery can cause serious injury or death.
Please keep batteries out of sight or reach of children.
CALIFORNIA, USA ONLY
e Lithium battery adopted on this motherboard contains Perchlorate, a toxic substance
controlled in Perchlorate Best Management Practices (BMP) regulations passed by the
California Legislature. When you discard the Lithium battery in California, USA, please
follow the related regulations in advance.
“Perchlorate Material-special handling may apply, see www.dtsc.ca.gov/hazardouswaste/
perchlorate”
AUSTR ALIA ONLY
Our goods come with guarantees that cannot be excluded under the Australian Consumer
Law. You are entitled to a replacement or refund for a major failure and compensation for
any other reasonably foreseeable loss or damage caused by our goods. You are also entitled
to have the goods repaired or replaced if the goods fail to be of acceptable quality and the
failure does not amount to a major failure. If you require assistance please call ASRockInd
Tel : [phone] ext.123 (Standard International call charges apply)
ASRockInd INC. hereby declares that this device is in compliance with the essential re-
quirements and other relevant provisions of related UKCA Directives. Full text of UKCA
declaration of conformity is available at: http://www.asrockind.com
ASRockInd INC. hereby declares that this device is in compliance with the essential re-
quirements and other relevant provisions of related Directives. Full text of EU declaration
of conformity is available at: http://www.asrockind.com
ASRockInd follows the green design concept to design and manufacture our products,
and
makes sure that each stage of the product life cycle of ASRockInd product is in line with
global
environmental regulations. In addition, ASRockInd disclose the relevant information
based on regulation requirements.
Please refer to https://www.asrockind.com/general/about.asp?cat=Responsibility for in-
formation disclosure based on regulation requirements ASRockInd is complied with.
DO NOT throw the motherboard in municipal waste. is product has been
designed to enable proper reuse of parts and recycling. This symbol of the
crossed out wheeled bin indicates that the product (electrical and electronic
equipment) should not be placed in municipal waste. Check local regulations
for disposal of electronic products.

Contents
Chapter 1 Introduction 1
1.1 Package Contents 1
1.2 Specications 2
1.3 Motherboard Layout 4
1.4 I/O Panel 6
1.5 Block Diagram 7
Chapter 2 Installation 8
2.1 Screw Holes 8
2.2 Pre-installation Precautions 8
2.3 Installation of Memory Modules 9
2.4 Expansion Slots 10
2.5 Onboard Headers and Connectors 11
Chapter 3 UEFI SETUP UTILITY 16
3.1 Introduction 16
3.1.1 Entering BIOS Setup 16
3.1.2 UEFI Menu Bar 17
3.1.3 Navigation Keys 18
3.2 Main Screen (Advanced Mode) 19
3.3 Advanced Screen 20
3.3.1 CPU Conguration 21
3.3.2 Chipset Conguration 24
3.3.3 Storage Conguration 26
3.3.4 Super IO Conguration 28
3.3.5 ACPI Conguration 29
3.3.6 USB Conguration 30
3.3.7 Trusted Computing 31
3.4 Hardware Health Event Monitoring Screen 33
3.5 Security Screen 34
3.6 Boot Screen 35
3.7 Exit Screen 37

1
SOM-P104
Chapter 1 Introduction
ank you for purchasing ASRockInd SOM-P104 motherboard, a reliable mother-
board produced under ASRockInd’s consistently stringent quality control. It delivers
excellent performance with robust design conforming to ASRockInd’s commitment to
quality and endurance.
In this manual, chapter 1 and 2 contain introduction of the motherboard and step-by-
step guide to the hardware installation. Chapter 3 contains the conguration guide to
BIOS setup.
Because the motherboard specications and the BIOS soware might be updated, the
content of this manual will be subject to change without notice. In case any modica-
tions of this manual occur, the updated version will be available on ASRockInd website
without further notice. You may nd the latest CPU support lists on ASRockInd web-
site as well.
ASRockInd website https://www.asrockind.com/
If you require technical support related to this motherboard, please visit our website for
specic information about the model you are using.
https://www.asrockind.com/support/index.asp
1.1 Package Contents
ASRockInd SOM-P104 Motherboard (Pico-ITX (3.9-in x 2.8-in x 0.76-in, 10 cm x 7.2
cm x 1.93 cm))
• Gi Package:
1 x CPU SINK 100*72mm
2 x SCREW M2*2, D=5
1 x COM Cable
• Bulk Package:
2 x SCREW M2*2, D=5

2
1.2 Specications
Form Factor Dimensions Pico-ITX (3.9-in x 2.8-in x 0.76-in, 10 cm x 7.2 cm x 1.93
cm)
Processor
System
CPU Intel® Alder Lake-N SoC Processors
Chipset SoC
BIOS AMI SPI 256 Mbit
Memory
Technology Dual Channel DDR5 4800 MHz
Capacity 16GB
Socket 1 x 262-pin SO-DIMM
Graphics
Controller Intel® UHD Graphics
HDMI HDMI 2.0b
Max resolution up to 4096 x 2160@60Hz
DisplayPort
Display Port 1.4a, DP++
Max resolution up to 4096x2160@60Hz
*From MIOe slot
LVDS Dual channel 24 bit up to 1920 x 1200@60Hz
(Connector shared with eDP)
eDP Max resolution up to 1920 x 1080@60Hz
(Connector shared with LVDS)
Multi Display Triple Display
Expansion
Slot
M.2 1 x M.2 (Key E, 2230) with PCIe Gen3 x1 and USB 2.0 for
Wireless
MIOe 1 (DP, 1 x USB 3.2 Gen2, 1 x USB 2.0, 3 x PCIe x1)
Audio Interface Realtek ALC897, High Denition Audio. Line-In, Line-Out,
Mic-In
Ethernet
Controller/
Speed Realtek RTL8125BG with 10/100/1000/2500 Mbps
Controller 1 x RJ-45
Rear I/O
HDMI 1 x HDMI 2.0b
Ethernet 1 x 2.5 Gigabit LAN
USB 1 x USB 3.2 Gen2 (Type A)
DC Jack 1
Internal
Connector
USB 2 x USB 2.0 (1 x 2.00mm pitch header)
COM COM1, COM3 (RS-232/422/485)
GPIO 4 x GPI, 4 x GPO
LVDS 1 (Connector with LVDS/eDP signal, switch by BIOS)
Storage M.2 1 x M.2 (Key M, 2242/2280) with PCIe Gen3 x1 or SATA3
and USB 2.0 for SSD
Watchdog
Timer
Output From Super I/O to drag RESETCON#
Interval 256 Segments, 0, 1, 2, ...255 Sec

3
SOM-P104
Power
Requirements
Input PWR 12V DC-In
Power On
AT/ATX Supported
-AT: Directly PWR on as power input ready
-ATX: Press button to PWR on aer power input ready
Environment
Operating
Temp 0ºC - 70ºC
Storage Temp -40ºC - 85ºC
Operating
Humidity 5% - 90%
Storage
Humidity 5% - 90%

4
1.3 Motherboard Layout
24
135
7
6
8
10 9
11
LVDS1
1
1
JGPIO1
M2_E1
1
JP_SET1
BLT_SEL1
LVDS_PJ1
DC_JACK1
U2
USB3.2 Gen2:
USB3_1
1
USB2_2_3
1 1
M2_M1
LAN1
MIOE1
12
CPU_FAN1
1
BAT1
BAT1
HDMI1
13
14
15
DDR5_A1 (Support DDR5L Only)
1
COM1
1
COM3
1
HD_AUDIO1
1
PANEL 1
Industrial
16
17

5
SOM-P104
1 : USB2.0 Header (USB2_2_3) (2.00mm pitch)
2 : Digital Input / Output Pin Header (JGPIO1)
3 : LVDS_PJ1
4 : BLT_SEL1
5 : LVDS Panel Connector (LVDS1)
6 : M.2 Key-M Socket (M2_M1)
7 : M.2 Key-E Socket (M2_E1)
8 : Battery Connector (BAT1)
9 : JP_SET1
10 : BIOS ROM (U2)
11 : 4-Pin CPU FAN Connector (CPU_FAN1)
12 : MIOE1
13 : DDR5 (DDR5_A1)
14 : COM Port Header (COM3) (RS-232/422/485)
15 : COM Port Header (COM1) (RS-232/422/485)
16 : HD Audio Header (HD_AUDIO1)
17 : System Panel Header (PANEL1)

6
1.4 I/O Panel
1 DC-In Jack (DC_JACK1)
2 HDMI Port (HDMI1)
3 USB3.2 Gen2 Port (USB3_1)
4 RJ45 LAN Port (LAN1)*
23
14
Activity/Link LED SPEED LED
* ere are two LEDs next to the LAN ports. Please refer to the table below for the LAN
port LED indications.
LAN Port LED Indications
Status Description
O No Link
Blinking Data Activity
On Link
Status Description
O 10Mbps connection
Orange 100Mbps connection
Green 2.5Gbps connection
ACT/LINK
LED
SPEED
LED
LAN Port

7
SOM-P104
1.5 Block Diagram
Intel
Alder Lake-
N
FCBGA
1493
Package
(35*24mm)
Chrontel
CH7513
DDIA
LVDS/ eDP
LVDS/
EDP bypass
mode
HDMI
Connector DDIB
M.2 Key E 1* USB2.0(#8)
2.5Gb LAN
RJ45 RTL8125BG
M.2 Key_M
Type
2242/2280
1* PCIe Gen3x1(PEIe#12)
DDR5 4800MHZ DDR5 4800Mhz
SO-DIMM up to 16GB
Line out & Mic
in & Speaker
out
Header
Audio Realtek
ALC897
HDA
2* Internal
USB2.0 ports
2* USB2.0(#2,#3)
TCP0(DP)
MIOe Connector
SMBUS
eSPI
PLTRST#
3* PCIe Gen3x1(#4,#9,#10)
1* USB3.2 Gen2x1(#2)
1* USB2.0(#4)
SPI
SPI FLASH
3.3V/256Mb
1* USB2.0(#6)
SOM-P104J
1* PCIe Gen3x1(#7)
1* PCIe
Gen3x1(#3)
Rear USB3.2
Gen2x1
1* USB3.2 Gen2x1(#1)
1* USB2.0(#1)
+12VSB
+5VSB
eSPI
GPIO
Super I/O
NCT5525D
COM1: RS232/422/485
COM3: RS232/422/485 UART*2
CPU FAN1
JGPIO
-4out(SIO)
-4in(SOC)
FAN
GPIO

8
Chapter 2 Installation
is is a Pico-ITX (3.9-in x 2.8-in x 0.76-in, 10 cm x 7.2 cm x 1.93 cm) form factor
motherboard. Before you install the motherboard, study the configuration of your
chassis to ensure that the motherboard ts into it.
2.1 Screw Holes
Place screws into the holes to secure the motherboard to the chassis.
2.2 Pre-installation Precautions
Take note of the following precautions before you install motherboard components or
change any motherboard settings.
1. Unplug the power cord from the wall socket before touching any component.
2. To avoid damaging the motherboard components due to static electricity, NEV-
ER place your motherboard directly on the carpet or the like. Also remember to
use a grounded wrist strap or touch a safety grounded object before you handle
components.
3. Hold components by the edges and do not touch the ICs.
4. Whenever you uninstall any component, place it on a grounded antistatic pad or
in the bag that comes with the component.
5. Heatsink (e thermal solution of whole system needs to be designed addition-
ally.)
Make sure to unplug the power cord before installing or removing the motherboard. Failure to
do so may cause physical injuries to you and damages to motherboard components.
Do not over-tighten the screws! Doing so may damage the motherboard.
Before you install or remove any component, ensure that the power is switched o or the
power cord is detached from the power supply. Failure to do so may cause severe damage to
the motherboard, peripherals, and/or components.

9
SOM-P104
2.3 Installation of Memory Modules
SOM-P104 provides one 262-pin DDR5 (Double Data Rate 5) SO-DIMM slots, and
supports Dual Channel Memory Technology.
e DIMM only ts in one correct orientation. It will cause permanent damage to the moth-
erboard and the DIMM if you force the DIMM into the slot in the incorrect orientation.
1. For dual channel conguration, you always need to install identical (the same brand,
speed, size and chip-type) DDR5 DIMM pairs.
2. It is unable to activate Dual Channel Memory Technology with only one memory
module installed.
3. It is not allowed to install a DDR, DDR2, DDR3 or DDR4 memory module into a
DDR5 slot; otherwise, this motherboard and DIMM may be damaged.
Step 1. Align a SO-DIMM on the slot such that the notch on the SO-DIMM
matches the break on the slot.
Step 2. Firmly insert the SO-DIMM into the slot until the retaining clips at both
ends fully snap back in place and the SO-DIMM is properly seated.

10
2.4 Expansion Slots
ere are 2 M.2 sockets on this motherboard.
M.2 sockets: 1 x M.2 (Key E, 2230) with PCIe Gen3 x1 and USB 2.0 for Wireless
1 x M.2 (Key M, 2242/2280) with PCIe Gen3 x1 or SATA3 and USB 2.0
for SSD
M.2 Key-M Socket (M2_M1) M.2 Key-E Socket (M2_E1)
Pin Signal Signal Pin
1GND +3.3V 2
3GND +3.3V 4
5NA NA 6
7NA NA 8
9GND HD_LED 10
11 NA +3.3V 12
13 NA +3.3V 14
15 GND +3.3V 16
17 NA +3.3V 18
19 NA NA 20
21 GND NA 22
23 NA NA 24
25 NA NA 26
27 GND NA 28
29 NA NA 30
31 NA NA 32
33 GND USB D+ 34
35 NA USB D- 36
37 NA NA 38
39 GND SMB_CLK 40
41 PER n0/SATA-B+ SMB_DATA 42
43 PERp0/SATA-B- NA 44
45 GND NA 46
47 PETn0/SATA-A- NA 48
49 PETP 0/SATA-A+ PERST# 50
51 GND CLKREQ# 52
53 PEFCLKn WA KE # 54
55 PEFCLKp NA 56
57 GND NA 58
67 NA NA 68
69 PEDET +3.3V 70
71 GND +3.3V 72
73 GND +3.3V 74
75 GND
Pin Signal Signal Pin
1GND +3VSB 2
3USB_D+ +3VSB 4
5USB_D- NA 6
7GND NA 8
9CNV_WGR _D1- CNV_RF_RESET 10
11 CNV_WGR _D1+ NA 12
13 GND MODEM_CLKREQ 14
15 CNV_WGR _D 0 - NA 16
17 CNV_WGR _D 0 + GND 18
19 GND BC_PROCHOT 20
21 CNV_WGR _CLK- C N V_BR I_R S P 22
23 CNV_WGR _CLK+
33 GND CNV_BGI_DT 32
35 PE Tp CNV_RGI_RSP 34
37 PETn CNV_ BR I_ D T 36
39 GND NA 38
41 PERp NA 40
43 PERn NA 42
45 GND CNV_PA_BLANKING 44
47 PEFCLKp CN V_MF UART 2 _T XD 46
49 PEFCLKn C NV_ M FUA RT 2 _ R X D 48
51 GND SUSCLK 50
53 CLKREQ# PERST# 52
55 NA W_DISA BLE1# 54
57 GND W_DISABLE2# 56
59 CNV_WT_D1- SMB _DATA 58
61 CNV_WT_D1+ SMB_CLK 60
63 GND NA 62
65 CNV_WT_D 0 - NA 64
67 CNV_WT_D 0 + NA 66
69 GND NA 68
71 CNV_WT_CLK- NA 70
73 CNV_WT_CLK+ +3VSB 72
75 GND +3VSB 74

11
SOM-P104
Digital Input / Output Pin Header
(10-pin JGPIO1)
(see p. 4, No. 2)
USB2.0 Header (2.00mm pitch)
(9-pin USB2_2_3)
(see p. 4, No. 1)
ere is one USB 2.0 header on this motherboard.
2.5 Onboard Headers and Connectors
1
2
Pin Signal Name Pin Signal Name
10 9 DUMMY
9 GND 7 GND
6 P+ 5 P+
4P- 3P-
2 USB_PWR 1 USB_PWR
910
1
2
9
10
Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name
2 GPP_B15 4 GPP_E1 6 GPP_E2 8 GPP_E13 10 GND
1 SIO_GP63 3 SIO_GP64 5 SIO_GP86 7 SIO_GP87 9 +JGPIOPWR
LVDS_PJ1
(10-pin LVDS_PJ1)
(see p. 4, No. 3)
10
9
2
1
Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name
9 +12V 7 +12V 5 +5V 3 +5V 1 +3V
10 BLTVCC 8BLTVCC 6BLTVCC 4PLVDD 2PLVDD
Onboard headers and connectors are NOT jumpers. Do NOT place jumper caps over these
headers and connectors. Placing jumper caps over the headers and connectors will cause per-
manent damage to the motherboard!
BLT_SEL1
(10-pin BLT_SEL1)
(see p. 4, No. 4)
Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name
9 GND 7 BLT_CTL 5 BLT_EN 3 BLT_VCC 1 BLT_VCC
10 GND 8 GPIO_TEST# 6 PWRDN 4 BLUP 2BLDN
10
9
2
1

12
LVDS Panel Connector
(40-pin LVDS1)
(see p. 4, No. 5)
Pin Signal Name Signal Name Pin
2 LCD_VCC LCD_VCC 1
4 N/A +3.3V 3
6 LVDS_A_DATA0# N/A 5
8 GND LVDS_A_DATA0 7
10 LVDS_A_DATA1 LVDS_A_DATA1# 9
12 LVDS_A_DATA2# GND 11
14 GND LVDS_A_DATA2 13
16 LVDS_A_DATA3 LVDS_A_DATA3# 15
18 LVDS_A_CLK# GND 17
20 GND LVDS_A_CLK 19
22 LVDS_B_DATA0 LVDS_B_DATA0# 21
24 LVDS_B_DATA1# GND 23
26 GND LVDS_B_DATA1 25
28 LVDS_B_DATA2 LVDS_B_DATA2# 27
30 LVDS_B_DATA3# DPLVDD_EN 29
32 GND LVDS_B_DATA3 31
34 LVDS_B_CLK LVDS_B_CLK# 33
36 CON_LBKLT_EN GND 35
38 LCD_BLT_VCC CON_LBKLT_CTL 37
40 LCD_BLT_VCC LCD_BLT_VCC 39
139
40
2
40 2
39 1
Battery Connector
(BAT1)
(see p. 4, No. 8)
BAT1
JP_SET1
(10-pin JP_SET1)
(see p. 4, No. 9)
10
9
2
1
Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name
9 JGPIO_VSET 7 JGPIO_VSET 5 RTC RST# 3 RTCRST2# 1 AT/ATX mode
10 +3V 8 GND 6 GND 4 GND 2 GND
BIOS ROM
(U2)
(see p. 4, No. 10)
1
Pin Signal Name
1 GND
2 +5V
3 FAN_SPEED
4 FAN_SPEED_CONTROL
4
1
CPU FAN Connector
(4-pin CPU_FAN1)
(see p. 4, No. 11)
U2
+ -
1-2: AT mode(short)
ATX mode(open)
3-5: Auto Clear CMOS
5-6: Clear CMOS

13
SOM-P104
Support interface:
3* PCIe Gen3x1
1* USB3.2 Gen2
1* USB2.0
1* DP1.4
DDR5_A1
(see p. 4, No. 13)
MIOE1
(see p. 4, No. 12)
Pin Signal Name Signal Name Pin
1 GND GND 41
2 PCI_RXP1 PCIe_TXP1 42
3 PCI_RXN1 PCIe_TXN1 43
4 GND GND 44
5 PCI_RXP2 PCIe_TXP2 45
6 PCI_RXN2 PCIe_TXN2 46
7 GND GND 47
8 PCI_RXP3 PCIe_TXP3 48
9 PCI_RXN3 PCIe_TXN3 49
10 GND GND 50
11 NC NC 51
12 NC NC 52
13 MIOE_DET# GND 53
14 PCIe_CLKP1 AUDIO_AUX_L 54
15 PCIe_CLKN1 AUDIO_AUX_R 55
16 GND AGND 56
17 SMB_CLK_MAIN HDMI_DDCCLK 57
18 SMB_DATA_MAIN HDMI_DDCDATA 58
19 PCIe_WAKE# ESPI_CLK 59
20 SYS_RESET# ESPI_IO_0 60
21 SLP_S3# ESPI_IO_1 61
22 PWRBTN# ESPI_IO_2 62
23 DDI_HPD# ESPI_IO_3 63
24 GND ESPI_RESET# 64
25 DDI_AUXP ESPI_ALERT# 65
26 DDI_AUXN ESPI_CS0# 66
27 GND GND 67
28 DDI_TXP0 USB3_TXP 68
29 DDI_TXN0 USB3_TXN 69
30 GND GND 70
31 DDI_TXP1 USB3_RXP 71
32 DDI_TXN1 USB3_RXN 72
33 GND GND 73
34 DDI_TXP2 USB2_P+ 74
35 DDI_TXN2 USB2_P- 75
36 GND GND 76
37 DDI_TXP3 +5VSB 77
38 DDI_TXN3 +5VSB 78
39 GND +5VSB 79
40 +12VSB +12VSB 80
1
40
41
80
COM Port Headers (RS-232/422/485)
(10-pin COM3)
(see p. 4, No. 14)
(10-pin COM1)
(see p. 4, No. 15)
1
2
910 Pin Signal Name Pin Signal Name
10 N/A 9 N/A
9 CCTS#3 7 RRTS#3
6 DDSR#3 5 GND
4 DDTR#3 3 TTXD3
2 RRXD3 1 DDCD#3
Pin Signal Name Pin Signal Name
10 N/A 9 N/A
9 CCTS#1 7 RRTS#1
6 DDSR#1 5 GND
4 DDTR#1 3 TTXD1
2 RRXD1 1 DDCD#1
1
2
910
1-2: AT mode(short)
ATX mode(open)
3-5: Auto Clear CMOS
5-6: Clear CMOS

14
HD Audio Header
(10-pin HD_AUDIO1)
(see p. 4, No. 16)
is is an interface for front panel audio cable that allows convenient connection and
control of audio devices.
1
2
910 Pin Signal Name Pin Signal Name
10 MIC1_L 9 MIC1_R
9 AGND_A 7 MIC1_JD
6 LIN1_L 5 FRONT_L
4 LIN1_JD 3 FRONT_JD
2 LIN1_R 1 FRONT_R
System Panel Header
(10-pin PANEL1)
(see p. 4, No. 17)
1
2
910 Pin Signal Name Pin Signal Name
10 N/A 9 GND
9 GND 7 RESET#
6 PWRBTN# 5 GND
4 PLED- 3 HDLED-
2 PLED+ 1 HDLED+
is motherboard supports RS232/422/485 on COM1 and COM3 ports. Please refer to the
table below for the pin denition. In addition, COM1 and COM3 ports (RS232/422/485) can
be adjusted in BIOS setup utility > Advanced Screen > Super IO Conguration. You may
refer our manual for details.
COM1, COM3 Ports Pin Denition
PIN RS232 RS422 RS485
1 DCD TX- RTX-
2 RXD RX+ N/A
3 TXD TX+ RTX+
4DTR RX- N/A
5 GND GND GND
6DSR N/A N/A
7RTS N/A N/A
8 CTS N/A N/A
9 NA/+5V/+12V N/A N/A
Connect the power switch, reset switch and system status indicator on the chassis to this
header according to the pin assignments below. Note the positive and negative pins before
connecting the cables.
PWRBTN (Power Switch):
Connect to the power switch on the chassis front panel. You may congure the way to turn
o your system using the power switch.
RESET (Reset Switch):
Connect to the reset switch on the chassis front panel. Press the reset switch to restart the
computer if the computer freezes and fails to perform a normal restart.

15
SOM-P104
PLED (System Power LED):
Connect to the power status indicator on the chassis front panel. e LED is on when the
system is operating. e LED keeps blinking when the system is in S3 sleep state. e LED
is o when the system is in S4 sleep state or powered o (S5).
HDLED (Hard Drive Activity LED):
Connect to the hard drive activity LED on the chassis front panel. e LED is on when the
hard drive is reading or writing data.
The front panel design may differ by chassis. A front panel module mainly consists of
power switch, reset switch, power LED, hard drive activity LED, speaker and etc. When
connecting your chassis front panel module to this header, make sure the wire assignments
and the pin assignments are matched correctly.