
Serial Ports
EPM-31 Hardware Reference Manual
44
S
ERIAL
P
ORT
C
ONNECTOR
P
INOUTS
Table 10: J13 COM1/COM2 Connector Pinout
Pin
RS-232 Signal
RS-422/RS-485 Signal
Port
1
RTS1
TXD1_P
COM1
2
TXD1#
TXD1_N
3
CTS1
RXD1_P
4
RXD1#
RXD1_N
5
GND
GND
—
6
RTS2
TXD2_P
COM2
7
TXD2#
TXD2_N
8
CTS2
RXD2_P
9
RXD2#
RXD2_N
10
GND
GND
—
C
ABLING
An adapter cable, part number CBR-1014, is available for routing the J13 signals to 9-pin D-sub
connectors. This is a 12-inch, Pico-Clasp 10-pin to two 9-pin D-sub connector cable.
If your application requires a custom cable, the following information will be useful:
EPM-31 Board Connector
Mating Connector
Molex 501331-1007
Molex 501330-1000
RS-485
M
ODE
L
INE
D
RIVER
C
ONTROL
The transmit line driver can be automatically turned on and off based on data availability in the
UART output FIFO. This mode can be enabled in the BIOS setup utility. The transmit line driver
can be enabled in the BIOS Setup utility.