Onlogic HX401 Product Manual page 23

M.2 M-Key
An M.2 M-Key port is present on the Helix motherboard to allow support for M-Key form-factor
expansion cards. Only 2280 form-factor cards are supported. The M-Key connector on the Helix
platform includes support for PCIe Gen4x4 or Gen 3 x4.
A full pinout table for this expansion slot is provided in Appendix F
SO-DIMM1 & SO-DIMM2
The Helix platform has two onboard DDR5 SO-DIMM Slots. Below find the specifications of the two
SO-DIMM Slots:
Maximum Capacity: DDR5-4800 64GB with two 32GB SO-DIMM Modules
●
Channel configuration: 1DIMM Per Channel (DPC) - 2 Channels
●
No ECC Support
●
COM1
The two on-board COM headers utilize standard 9-pin 2.00mm pitch male pin headers with the pin
configuration in the chart below. These serial ports support RS-232, RS-422 Full-Duplex, and RS-485
half-Duplex configurations. The serial port communication mode can be selected in the BIOS
configuration. In addition, 5V power can be enabled on pin 9 in the same BIOS menu. Pin 9 is rated to
provide 150mA of current. Refer to the BIOS manual (Appendix C) for configuration instructions.
Pin
1
2
3
4
5
6
7
8
9
10
Motherboard Serial header pinout
RS-232 RS-422
DCD TX-
RX TX+
TX RX+
DTR RX-
GND NC
DSR NC
RTS NC
CTS NC
RI/PWR NC/PWR
(KEY) (KEY)
RS-485
TX-/RX-
TX+/RX+
NC
NC
NC
NC
NC
NC
NC/PWR
(KEY)
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