AXIOMTEK PICO300, User Manual

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PICO300 Pico-ITX Board
I/O Boards (Optional) 73
A.12.5 USB 3.0 Stack Connector (CN6)
The board comes with a high rise double-deck Universal Serial Bus (compliant with USB
3.0 (5Gb/s)) connector on the rear I/O which are for installing USB peripherals such as
keyboard, mouse, scanner, etc.
A.12.6 COM1 and COM2 D-Sub Connector (CN7A and CN7B)
The CN7 is a double-deck 9-pin D-Sub connector. The lower connector (CN7A) is for
COM2 and the upper connector (CN7B) is for COM1. Note that only COM1 port comes
with power capability on DCD and RI pins by setting jumper (see section A.11.1). If you
need COM1 port to support RS-422 or RS-485 mode, please do it via BIOS setting (see
section 4.4). The pin assignments of RS-232/422/485 are listed in table below.
CN7B
CN7A
Pin Signal Pin Signal
1
USB_VCC (+5V level
standby power)
10
USB_VCC (+5V level
standby power)
2 USB_Data2- 11 USB_Data3-
3 US 12 US
4 GND 13 GND
5 SSRX2- 14 SSRX3-
6 SSRX2+ 15 SSRX3+
7 GND 16 GND
8 SSTX2- 17 SSTX3-
9 SSTX2+ 18 SSTX3+
CN7B Pin RS-232 RS-422 RS-485
1 DCD TX- Data-
2 RXD TX+ Data+
3 TXD RX+ No use
4 DTR RX- No use
5 GND No use No use
6 DSR No use No use
7 RTS No use No use
8 CTS No use No use
9 RI No use No use
CN7A Pin Signal
1 Data Carrier Detect (DCD)
2 Receive Data (RXD)
3 Transmit Data (TXD)
4 Data Terminal Ready (DTR)
5 Ground (GND)
6 Data Set Ready (DSR)
7 Request to Send (RTS)
8 Clear to Send (CTS)
9 Ring Indicator (RI)