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Pin No.
15
13
11
9
7
5
3
1
2.2.8 COM1~COM4 : Serial Port
Serial port 1 to 4 (COM1 to 4) can be configured for RS-232, RS-422, or RS-485 with
auto flow control communication. The default definition of COM1 and COM2 is RS-
232, if you want to change to RS-422 or RS-485, you can find the setting in BIOS.
3
4
3
1
1
BIOS Setting
The pin assignments are listed in the following table :
Serial
25
22
20
39
40
5
4
1
3
2
Port
1, 2
3, 4
©Vecow EXBC-1000 User Manual
Signal Name
GND
REFCLK+
REFCLK-
GND
CLKREQ#
Reserved
Reserved
WAKE#
4
1
4
6
4
3
COM1
COM2
COM3
COM4
4
19
1
1
1
4
4
1
4
2
21
Pin No.
RS-232
22
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Pin No.
16
14
12
10
8
6
4
2
1
1
39
8
1
4
40
3
1
1
1
7
Function
RS-232
RS-422 (5-wire)
RS-422 (9-wire)
RS-485
RS-485 w/z auto-flow control
L4
R10
R9
RS-422
(5-wire)
TXD-
TXD+
RXD+
RXD-
GND
-----------
-----------
-----------
-----------
GETTING TO KNOW YOUR EXBC-1000
Signal Name
UIM_VPP
UIM_RESET
UIM_CLK
UIM_DATA
UIM_PWR
1.5V
GND
3.3Vaux
1
7
1
7
C1
COM4
COM3 COM2
260
259
10
C2
1
2
1
3
10
1
1
L5
L1
L8
R12
R2
R20
18
14
9
R19
R11
R1
RS-422
RS-485
5
9
4
1
1
(9-wire)
(3-wire)
TXD-
DATA-
TXD+
DATA+
RXD+
-----------
RXD-
-----------
GND
GND
RTS-
-----------
RTS+
-----------
CTS+
-----------
CTS-
-----------
1
COM1
1
10
3
1
5
1
4
52
8
7
1
14
2
8
5
4
7
1
19
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