CBR-5009B and CBR-4004 Paddleboards
EBX-18 Hardware Reference manual
50
S
ERIAL
P
ORT
C
ONNECTORS
Serial ports COM1 and COM2 use standard DB9 connectors. Serial ports COM3 and COM4 are
accessible through five-pin screw terminal blocks. Refer to Figure 21 for the location of pin 1 of
the COM3/COM4 ports. These connectors use IEC 61000-4-2-rated TVS components to help
protect against ESD damage.
Table 34: J3 COM1/COM2 Pinout
Top DB9 Connector Pin
(COM1)
Bottom DB9 Connector Pin
(COM2)
RS-232 Signal
1
10
DCD
2
11
RXD*
3
12
TXD*
4
13
DTR
5
14
Ground
6
15
DSR
7
16
RTS
8
17
CTS
9
18
RI
Serial ports COM3 and COM4 are accessible through five-pin screw terminal blocks. Refer to
Figure 21 for the location of pin 1 of the COM3/COM4 ports.
Table 35: J6 (COM3) Connector Pinout
Pin
Signal
1
GND
2
TRX3-
3
TRX3+
4
TX3-
5
TX3+
Table 36: J5 (COM4) Connector Pinout
Pin
Signal
1
GND
2
TRX4-
3
TRX4+
4
TX4-
5
TX4+