ASRock IMB-1242 10th Gen Comet Lake-S Mini-ITX Motherboard Owner’s Manual

: September 16, 2024
: ASRock

IMB-1242 10th Gen Comet Lake-S Mini-ITX Motherboard

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Specifications

Product Model: IMB-1242
Industrial grade
Various headers and connectors for power, communication, and
peripherals

Product Usage Instructions

Jumpers and Headers Settings

Ensure correct settings for jumpers and headers according to the
following guide:

PWR_COM1 & PWR_COM2

Set jumper to +5V for default or +12V for alternate power
setting.

Configure the pins based on the signal names provided.

Connect the USB signals based on the pin configuration.

24-pin ATX Power Input Connector (ATXPWR1)

Connect the power input pins as per the specified signal
names.

DACC1_PCIE_PWR1

Select between No ACC and ACC* by setting the jumper
accordingly.

Configure the pins for TPM power, reset, and communication
signals.

Connect the USB signals as per the pin configuration.

SMBUS_TEST1

Utilize the specified signals for testing purposes.

Set the pins for digital input/output communication.

Digital Input/Output Power Select (JGPIO_PWR1)

Choose between +12V (default) or +5V power settings.

Digital Input/Output Default Value Setting (JGPIO_SET1)

Select between Pull-High (default) or Pull-Low for default value
setting.

Set the header for chassis intrusion detection.

Configure the pins for system panel functions like power button
and LED indicators.

PWR_BAT1_SIO_AT1

Set the header for battery charging and ATX mode selection.

Chassis FAN Connector (+12V) (CHA_FAN1)

Connect the chassis fan for cooling purposes.

Frequently Asked Questions (FAQ)

Q: What is the default power setting for PWR_COM1 &

PWR_COM2?

A: The default power setting for PWR_COM1 & PWR_COM2 is
+5V.

A: Configure the TPM Header pins for TPM power, reset, and
communication signals as per the provided signal names.

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Jumpers and Headers Setting Guide

IMB-1242

The terms HDMI® and HDMI High-Definition Multimedia Interface, and the HDMI logo are trademarks or registered trademarks of HDMI Licensing LLC in the United States and other countries.

Revision History Date
September 13, 2023 December 8, 2023
January 2, 2024 April 29, 2024 July 26, 2024

Description First Release Second Release Third Release Fourth Release Fifth Release

1

2

3

4

5

33 32 31 30 29 28
27
26 25

PWR_COM2

PWR_COM1

1

1 ESPI1

COM2

COM1

1 1
USB3_3_4

1

ATXPWR1
1
BIOS ROM

DACC1_PCIE_PWR1

1

TPM1

1

USB2_5_6

DDR4_B1

SATA3_5 SATA3_4

VGA1

1 1 SATA_PWR1

BAT1 1

USB 3.2 Gen2
Top: USB3_2 Bottom: USB3_1

LAN2

USB 2.0
Top: USB2_8 Bottom: USB2_7

LAN1

HDMI1 DP1

1
M2_M1
1
M2_E1

1 PWR_LOSS1

BUZZ1

DDR4_A1
R
IMB-1242
Industrial

Mic-In Line-Out
1 HD_AUDIO1 1 SPDIF1

DC_4PIN1 1

PCIE1

1

SMBUS_TEST1 1
JGPIO1

1

JGPIO_SET1 JGPIO_PWR1

1 CI1_2
1
PANEL1

HDLED

RESET

1 PWR_BAT1_SIO_AT1
CHA_FAN1 1
CPU_FAN1 1 1 HEATER1 1 CLRMOS1

PWRBTN

PLED

6
7
8 9 10 11 12 13
14 15 16 17 18

24 23 22 21 20

19

1 : COM Port Pin9 PWR Setting Jumpers

PWR_COM1 (For COM Port1)

PWR_COM2 (For COM Port2)

1-2 : +5V (Default)

3

2-3 : +12V

1

2 : ESPI Header (ESPI1)

Signal Name

1

GND

2

ESPI_CLK

3

GND

4

ESPI_CS#

5

ESPI_RESET#

6

GND

7

+3V

8

ESPI_CS#1

9

PLTRST#

10

COM_RST#

11

ESPI_IO0

12

ESPI_IO1

13

ESPI_IO2

14

ESPI_IO3

15

ALERT#1

16

+3VSB

17

Internal Use

18

+5VSB

19

ESPI_ALERT#

20

GND

1

20

3 : USB 3.2 Gen1 Header (USB3_3_4)

Pin Signal Name Signal Name Pin

2

20

1

DUMMY

IntA_PA_D+ 2

3 IntA_PB_D+ IntA_PA_D- 4

5 IntA_PB_D-

GND

6

7

GND

IntA_PA_SSTX+ 8

1

19

9

DUMMY IntA_PA_SSTX- 10

11

DUMMY

GND

12

13

GND

IntA_PA_SSRX+ 14

15

DUMMY IntA_PA_SSRX- 16

17

DUMMY

Vbus

18

19

Vbus

20

4 : 24-pin ATX Power Input Connector (ATXPWR1)

1

12

Pin Signal Name Signal Name Pin

1

+3V

13

2

+3V

-12V

14

13

24

3

GND

15

4

+5V

PSON# 16

5

GND

17

6

+5V

GND

18

7

GND

19

8 PWROK_PS

NA

20

9 ATX+5VSB

+5V

21

10

+12V

+5V

22

11

+12V

+5V

23

12

+3V

GND

24

5 : DACC1_PCIE_PWR1

Signal Name

1

Open: No ACC

2

Short: ACC* (Default)

3

PSON#

4

GND

1

4

Auto clear CMOS when system boot improperly.

6 : TPM Header (TPM1)

Pin Signal Name Signal Name Pin

1 TPM PWR

RST#

2

3

CS#

4

5

IRA

MOSI

6

7

MISO

GND

8

9

CLK

GND

10

9

1

10

2

7 : USB 2.0 Header (USB2_5_6)

Pin Signal Name Signal Name Pin

1

2

1 USB_PWR USB_PWR 2

3

P-

4

5

P+

6

7

GND

8

9

DUMMY 10

9

10

8 : SMBUS_TEST1

Signal Name

1

GPP_E7

2

SMB_CLK_MAIN

3

SMB_DATA_MAIN

4

GND

9 : Digital Input/Output Pin Header (JGPIO1)

Pin Signal Name Signal Name Pin

1

2

1 SIO_GP71 GPP_H23 2

3 SIO_GP72 GPP_I10 4

5 SIO_GP73

GPP_E5

6

7 SIO_GP74

GPP_E6

8

9 JGPIOPWR_R GND

10

9

10

10 : Digital Input/Output Power Select

(JGPIO_PWR1)

1

1-2: +12V (Default)

2-3: +5V

3

11 : Digital Input/Output Default Value

Setting (JGPIO_SET1)

1

1-2: Pull-High (Default)

2-3: Pull-Low

3

12 : Chassis Intrusion Header (CI1_2)

Signal Name

1

1-2

Open: Normal Short: Active Case Open

3-4

Open: Active Case Open Short: Normal

4

13 : System Panel Header (PANEL1)

Pin Signal Name Signal Name Pin

1 HDLED+

PLED+

2

3 HDLED-

PLED-

4

5

GND

PWRBTN# 6

7 RESET#

GND

8

9

GND

10

1

2

9

10

14 : PWR_BAT1_SIO_AT1

Signal Name

1

PWR_BAT1:

1

Open: Normal (Default)

2

Short: Charge Battery*

4

3

SIO_AT1:

Open: ATX Mode (Default)

4

Short: AT Mode

Only supported by chargeable battery.

15 : Chassis FAN Connector (+12V) (CHA_FAN1)

Signal Name

4

1

GND

2

+12V

3

CHA_FAN_SPEED

1

4

FAN_SPEED_CONTROL

16 : CPU FAN Connector (+12V) (CPU_FAN1)

Signal Name

4

1

GND

2

+12V

3

CPU_FAN_SPEED

4

FAN_SPEED_CONTROL

1

17 : HEATER Header (HEATER1)

Signal Name

1

Heater_PWR (5V/1A)

2

GND

3

NTC (Negative Temperature Coefficient) thermistors

1

3

The 10k Ohm NTC thermistors is suggested. * Deep mode is not supported when the preheat function is enabled.

18 : Clear CMOS Header (CLRMOS1)

1-2: Normal (Default)

2-3: Clear CMOS

1

3

19 : PWR Loss Header (PWR_LOSS1)

Short: Power Loss (Default)

1

Open: no Power Loss

2

20 : 4-pin ATX PWR Connector (DC_4PIN1)

Signal Name

1

GND

2

GND

3

DC Input (12V only)

4

DC Input (12V only)

24 13

Installation of ROM Socket

1

2

3

4

5

33 32 31 30 29 28
27
26 25

PWR_COM2

PWR_COM1

1

1 ESPI1

COM2

COM1

1 1
USB3_3_4

1

ATXPWR1
1
BIOS ROM

DACC1_PCIE_PWR1

1

TPM1

1

USB2_5_6

DDR4_B1

SATA3_5 SATA3_4

VGA1

1 1 SATA_PWR1

BAT1 1

USB 3.2 Gen2
Top: USB3_2 Bottom: USB3_1

LAN2

USB 2.0
Top: USB2_8 Bottom: USB2_7

LAN1

HDMI1 DP1

1
M2_M1
1
M2_E1

1 PWR_LOSS1

BUZZ1

DDR4_A1
R
IMB-1242
Industrial

Mic-In Line-Out
1 HD_AUDIO1 1 SPDIF1

DC_4PIN1 1

PCIE1

1

SMBUS_TEST1 1
JGPIO1

1

JGPIO_SET1 JGPIO_PWR1

1 CI1_2
1
PANEL1

HDLED

RESET

1 PWR_BAT1_SIO_AT1
CHA_FAN1 1
CPU_FAN1 1 1 HEATER1 1 CLRMOS1

PWRBTN

PLED

6
7
8 9 10 11 12 13
14 15 16 17 18

24 23 22 21 20

19

· Do not apply force to the actuator cover after ic inserted. · Do not apply force to actuator cover when it is opening over 120 degree, Otherwise, the actuator cover may be broken.
· The yellow dot (Pin1) on the ROM must be installed at pin1 position of the socket (white arrow area). · Make sure the white dot on the ROM is installed outwards of the socket. · For further details of how to install ROM, please refer to ASRI website. Warning: If the installation does not follow as the picture, then it may cause severe damage to chipset & MB.

21 : M.2 Key-E Socket (M2_E1)

Pin Signal Name

Signal Name Pin

1

GND

+3.3V

2

3

USB_D+

+3.3V

4

5

USB_D-

NA

6

7

GND

NA

8

9 CNV_WGR_D1- CNV_RF_RESET 10

11 CNV_WGR_D1+

NA

12

13

GND

MODEM_CLKREQ 14

15 CNV_WGR_D0-

NA

16

17 CNV_WGR_D0+

GND

18

19

GND

NA

20

21 CNV_WGR_CLK- CNV_BRI_RSP 22

23 CNV_WGR_CLK+

33

GND

35

PETp

37

PETn

39

GND

41

PERp

43

PERn

45

GND

47

PEFCLKp

49

PEFCLKn

51

GND

53

CLKREQ#

55

NA

57

GND

59 CNV_WT_D1-

61 CNV_WT_D1+

63

GND

65 CNV_WT_D0-

67 CNV_WT_D0+

69

GND

71 CNV_WT_CLK-

73 CNV_WT_CLK+

75

GND

CNV_BGI_DT 32

CNV_RGI_RSP 34

CNV_BRI_DT 36

NA

38

NA

40

NA

42

NA

44

NA

46

NA

48

SUSCLK

50

PERST0#

52

W_DISABLE1# 54

W_DISABLE2# 56

SMB_DATA 58

SMB_CLK

60

NA

62

NA

64

NA

66

NA

68

NA

70

+3.3V

72

+3.3V

74

22 : M.2 Key-M Socket (M2_M1)

Pin Signal Name

Signal Name Pin

1

GND

+3.3V

2

3

GND

+3.3V

4

5

PERn3

NA

6

7

PERp3

NA

8

9

GND

SATA_LED

10

11

PETn3

+3.3V

12

13

PETp3

+3.3V

14

15

GND

+3.3V

16

17

PERn2

+3.3V

18

19

PERp2

NA

20

21

GND

NA

22

23

PETn2

NA

24

25

PETp2

NA

26

27

GND

NA

28

29

PERn1

NA

30

31

PERp1

NA

32

33

GND

NA

34

35

PETn1

NA

36

37

PETp1

NA

38

39

GND

SMB_CLK

40

41 PERn0 / SATA-B+ SMB_DATA 42

43 PERp0 / SATA-B-

NA

44

45

GND

NA

46

47 PETn0 / SATA-A-

NA

48

49 PETP0/ SATA-A+

PERST#

50

51

GND

CLKREQ#

52

53

PEFCLKn

NA

54

55

PEFCLKp

NA

56

57

GND

NA

58

67

NA

69

PEDET

71

GND

73

GND

75

GND

NA

68

+3.3V

70

+3.3V

72

+3.3V

74

23 : Front Panel Audio Header (HD_AUDIO1)

Pin Signal Name Signal Name Pin

10

9

1

MIC2_L

GND

2

3 MIC2_R

4

5 OUT2_R

MIC_RET 6

7 J_SENSE

8

2

1

9 OUT2_L

OUT_RET 10

24 : SPDIF Header (SPDIF1)

Signal Name

1

+5V

2

3

SPDIF OUT

4

GND

25 : Audio Jacks Green – Line Out
Pink – Mic In

4

1

26 : Top : DisplayPort (DP1) Bottom : HDMI Port (HDMI1)

27 : Top : RJ45 LAN Port (LAN1) Bottom: USB 2.0 Ports (USB2_7_8)

28 : Top : RJ45 LAN Port (LAN2) Bottom: USB 3.2 Gen2 Ports (USB3_1_2)

29 : Battery Connector (BAT1)

Signal Name

1

BAT+

2

GND

12

30 : SATA Power Output Connector (SATA_PWR1)

Signal Name

1

+5V

2

GND

3

GND

4

+12V

1

4

31 : D-Sub Port (VGA1)

32 : SATA3 Connectors (SATA3_4, SATA3_5)

Signal Name

1

GND

2

SATA-A+

3

SATA-A-

4

GND

5

SATA-B-

6

SATA-B+

7

GND

1

7

1

SATA3_5 SATA3_4

33 : Top : COM Port (COM1) (RS232/422/485)
Bottom : COM Port (COM2) (RS232/422/485)

This motherboard supports RS232/422/485 on COM1, 2 ports. Please
refer to the table below for the pin definition. In addition, COM1, 2 ports
(RS232/422/485) can be adjusted in BIOS setup utility > Advanced Screen

Super IO Configuration. You may refer to our user manual for details.

COM1, 2 Port Pin Definition

Pin RS232 RS422 RS485

1 DCD

2 RXD

3

TXD

4 DTR

TX-

RTX-

TX+

RTX+

RX+