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► Internal I/O Connectors
COM (Serial) ports
M.2 B Key (Option)
1
1
2
1
M.2 E Key
2230
6
5
1
1
1
COM1
(RS232/RS422/RS485)
Pin
Function
Pin
Function
1
MDCD1#
2
MSIN1
3
MSOUT1
4
MDTR1#
5
6
GND
MDSR1#
7
8
MRTS1#
MCTS1#
9
MRI1#
10
N.C.
COM2
(RS232)
Pin
Function
Pin
Function
1
MDCD2-
2
MSIN2-
3
MSO2-
4
MDTR2-
5
GND
6
MDSR2-
7
MRTS2-
8
MCTS2-
9
MRI2-
10
N.C.
User's Manual | EHL556
mini-PCIe
2
10
1
9
COM 1
2
10
1
9
COM 2
USB 6-7
USB 4-5
1
1
2
10
2
10
1
1
9
1
9
COM2
(8bit GPIO Pinout)
Pin
Function
Pin
1
2
DIO6
3
DIO5
4
5
GND
6
7
DIO2
8
9
10
DIO7
*Change COM2 to 8bit GPIO is available in different part number.
Connecting External Serial Ports
Your COM port may come mounted on a card-edge bracket. Install the card-edge bracket to
an available slot at the rear of the system chassis then insert the serial port cable to the COM
connector. Make sure the colored stripe on the ribbon cable is aligned with pin 1 of the COM
connector.
Function
DIO4
DIO3
DIO1
DIO0
----
Chapter 2
HARDWARE INSTALLATION
19
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