Asus RS720-E6/RS12 - Manual (Page 60)

4-14 Chapter 4: Motherboard information
10. Serial port connector (10-1 pin COM2)
This connector is for a serial (COM) port. Connect the serial port module
cable to this connector, then install the module to a slot opening at the back
of the system chassis.
O_DCD2 O_TXD2
GND
O_RTS2
O_RI2
O_RXD2 O_DTR2 O_DSR2 O_CTS2
11. BMC header (BMC_FW1)
The BMC connector on the motherboard supports an ASUS ® Server
Management Board 4 Series (ASMB4).