Ports; Rear I/O Ports - Supermicro SYS-521C-NR User Manual

4.4 Ports

Rear I/O Ports

See the figure below for the locations and descriptions of the various I/O ports on the rear
of the motherboard.
1
AIOM1 – AIOM2
Supermicro introduces the Advanced I/O Module (AIOM), the latest expansion card feature
offering PCIe 5.0 lanes in each slot which can be utilized to offer additional LAN ports, VPU,
storage devices, etc. on the motherboard. Visit the Supermicro website for all available module
options. Keep in mind that it is mandatory that power be unplugged prior to removing or
installing an AIOM module card to either one of these two expansion slots.
COM Port
The motherboard has one COM port. COM1 is located next to JUSBRJ45.
3
2 4
5
Rear I/O Ports
# Description
1 AIOM2
2 VGA
3 BMC LAN
4 USB2
COM Port
Pin Definitions
Pin# Definition
1 SP_DCDA
2 SP_RXDA
3 SP_TXDA
4 SP_DTRA
5 GND
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Chapter 4: Motherboard Connections
6 7
# Description
5 USB3
6 COM1
7 UID Switch
8 AIOM1
Pin# Definition
6 SP_DSRA
7 SP_RTSA
8 CTS
9 SP_RIA
10 NC