ADLINK AmITX-AL-I Embedded Motherboard Deployment and SEMA Management Guide

3. Jumpers and switches

JP1: ATX/AT mode selection (1-2=ATX, 2-3=AT).

JP6: Clear CMOS (1-2=normal, 2-3=clear).

JP11: SATA1/mSATA selection (1-2=SATA, 2-3=mSATA).

JP2: LVDS backlight power supply (1-2=12V, 2-3=5V).

JP3/JP5: LVDS panel power supply (5V/3.3V/12V combination).

JP4: Backlight enable polarity (1-2=Active High, 2-3=Active Low).

JP7/JP8 (COM1 power supply), JP9/JP10 (COM2 power supply): Select+12V,+5V, GND, or RI.

SWS1M/SWS2M: COM1/COM2 mode switch (RS-232/422/485).

BSW1: Dual BIOS selection and mode (select SPI0/SPI1 for positions 1-4 and Normal/Folsafe for positions 2-3).

Jumper configuration and key installation points

1. AT/ATX mode selection (JP1)

ATX mode (default 1-2): supports soft switching, ACPI power management (S3/S4/S5), and remote wake-up.

AT mode (2-3): Power on and start immediately, suitable for traditional applications that require forced self start.

2. Power input (choose one)

Only one of DC-in or ATX_PWR1 can be used for power supply. It is strictly prohibited to connect two power sources at the same time, otherwise the board may be damaged.

The maximum current is 10A, 12V ± 5%, and it is necessary to ensure that the adapter has sufficient power (recommended ≥ 60W).

3. Storage Configuration (JP11)

If using an mSATA solid-state drive, JP11 needs to be set to 2-3 (mSATA), at which point the SATA1 interface is disabled.

If using SATA hard drive/SSD, set JP11 to 1-2 (SATA), mSATA slot cannot be used for storage.

4. COM1/COM2 mode and power supply (key)

Use DIP switches SWS1M/SWS2M to select RS-232 (default), RS-422, or RS-485.

Select the power supply or signal for pin 1/9 through JP7/JP8 (COM1) and JP9/JP10 (COM2):

JP7/JP9：1‑2=+12V，3‑4=+5V；

JP8/JP10:1-2=GND, 3-4=RI (default).

This feature allows the board to directly provide power to external serial devices such as touch screens and scanners, simplifying wiring.

5. LVDS display settings

Panel voltage (JP3/JP5): Select 3.3V (default), 5V, or 12V according to the LCD specifications. JP3 and JP5 must be set simultaneously.

Backlight voltage (JP2): 5V (default) or 12V.

Backlight enable polarity (JP4): Active High (default) or Active Low.

The backlight brightness can be adjusted in BIOS (0~255).

Maximum load: The total current of panel power supply shall not exceed 1A (total of two circuits), and the backlight power supply shall not exceed 1A per circuit.

6. Dual BIOS Function (BSW1)

Position 1-4: Choose to start SPI0 (default) or SPI1.

Position 2-3: Normal BIOS (default) or Fail safe BIOS.

Failed safe mode is used to restore the system when the main BIOS is damaged, in conjunction with SEMA's automatic switching mechanism.

In depth analysis of SEMA onboard management function

The built-in SEMA (Smart Embedded Management Agent) in AmITX-AL-I enables industrial grade system management through BMC microcontrollers, without relying on an OS, providing the following key capabilities:

1. Running status statistics

Total runtime (accumulated S0 status in minutes).

This runtime (second level timing, power off reset).

Power on and startup times (including hardware/software reset and power on startup).

Startup reason: Record the last reset source (power failure, BIOS failure, watchdog reset, internal/external reset, etc.).

2. Voltage and current monitoring

BMC samples multiple voltages in real-time and provides numerical values through SEMA API (16 bit ADC conversion):

Calculation formula for monitoring object voltage

CPU‑Vcore (MSB<<8+LSB)×3.3/1024

GFX‑Vcore (MSB<<8+LSB)×3.3/1024

Vmem (MSB<<8+LSB)×3.3/1024

5VSB (MSB<<8+LSB)×1.826×3.3/1024

VIN(12V) (MSB<<8+LSB)×6.000×3.3/1024

5V (MSB<<8+LSB)×1.826×3.3/1024

3.3V (MSB<<8+LSB)×1.100×3.3/1024

Main current monitoring: Sample every 250ms and return the last 4 current values (unit: 8.06mA/LSB), which can be used for power consumption trend analysis.

3. Temperature monitoring and intelligent fan

Real time reading of CPU temperature and board temperature, recording startup value, minimum value, and maximum value.

Smart Fan supports multi-level temperature control curves (trigger temperature+PWM percentage), and can set temperature sources (CPU Sensor/Board Sensor) for both the CPU and system fans separately.

4. Watchdog Timer (Type-II)

The timeout value (in seconds or minutes) can be set through SEMA API or BIOS.

Automatically trigger system reset after timeout.

Support Power Up Watchdog, which can be temporarily disabled during startup by pressing F12 for easy debugging.

5. Dual BIOS fault recovery

BMC monitors the BIOS boot process. If the main BIOS fails to start, the hardware signal will automatically switch to Fail safe BIOS startup to ensure system recovery.

Users can manually select the boot BIOS and mode through BSW1.

6. Exception Codes

BMC outputs error codes through flashing blue status LED and records them in BMC Flags register:

Explanation of Code Error Messages

0 NO ERROR is normal

2 NOSUSCLK SUSCLK signal missing

3 NOSLP_S4_S5 SLP_S4/S5 signal missing

4 NOSLP_S3 SLP_S3 signal missing

5 BIOs_FAIL BIOS startup failure

Resetting 6 RESET_SAIL failed

7 RESITIN_FAIL External reset input failed

8 NOCB-PWRGD power supply good signal missing

9 CRITICAL_TEMP temperature critical