DFI CS551-C246 Quick Reference - Page 3
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COM Port Pin Assignment
LAN2
Pin
RS232
1
DCD-
2
RD
3
TD
4
DTR-
USB 5/6 (USB 2.0)
5
GND
6
DSR-
7
RTS-
8
CTS-
9
RI-
(USB 3.1
Note
Front Audio Pin Assignment
Pin
Assignment
1
Mic-L
LAN1
LAN2
3
Mic-R
5
Line-Out-R
LVDS
7
GND
9
Line-Out-L
Digital I/O Pin Assignment
SPI Flash BIOS
Pin
Assignment
DDR4_1 SODIMM
1
DIO_6
3
DIO_4
5
DIO_2
7
DIO_0
9
GND
Heater Switch Pin Header
Pin
Assignment
1
Manual Reset
Heater Box Header
Pin
Assignment
1
12V
Quick Reference | CS551
(USB 3.1
Note
RS422
RS485
TXD-
Data-
TXD+
Data+
RXD+
N.C.
LVDS
RXD-
N.C.
GND
GND
N.C.
N.C.
SPI Flash BIOS
N.C.
N.C.
N.C.
N.C.
USB 3/4 (left), 1/2 (right)
N.C.
N.C.
)
(USB 3.1
Pin
Assignment
DP++1/2
2
GND
4
N.C.
6
Mic-JD (sense)
1
8
KEY
2
9
1
9
10
Line-JD (sense)
USB 5/6 (USB 2.0)
10
2
10
Pin
Assignment
10
9
2
DIO_7
DIO
4
DIO_5
2
1
6
DIO_3
8
DIO_1
10
5VSB
Pin
Assignment
2
12VSB_PG_SW
5
1
Pin
Assignment
DDR4_1 SODIMM
2
2
12VSB_PG_SW
SMBus
)
DP++1/2
1
2
9
1
9
10
2
10
10
9
DIO
)
Note
2
1
Front
Audio
39
1
LVDS
40
2
1
COM1
9
2
10
Buzzer
SPI Flash BIOS
5
1
2
JP1
DIO
SMBus
M.2
M Key
Mini PCIe
Front
Audio
39
40
1
COM1
2
Buzzer
JP1
DP++1/2
10
9
M.2
2
1
M Key
39
6
5
2
1
40
1
9
6
5
1
2
1
2
10
2
Mini PCIe
10
9
1
1
2
1
1
1
1
1
1
Heater and Swit
5
1
Mini PCIe
2
SMBus
10
9
2
1
6
5
2
1
6
5
2
1
1
1
1
Front
Audio
JP3
1
JP5
COM1
1
1
Buzzer
LVDS
Backlight
Power
JP1
LED1
SATA 3.0
M.2
SATA
LAN1
M Key
Power
JP2
1
Battery
3
J
J
L
B
P
S
10
S
2
P
6
2
J
6
B
2
1