User`s manual

AIMB-240 Series
34 AIMB-240 Series User’s Manual
2.4.3 Serial Port Header (COM1_1)
Default
Signal PIN PIN Signal
DDCD1# 1 2 RRXD1
TTXD1 3 4 DDTR1#
GND 5 6 DDSR1#
RRTS1# 7 8 CCTS1#
RRI1# 9 10 No pin
COM1_1 and COM1 (Rear I/O) are
using the same link, so both
connectors cannot be used at the
same time.
Signal Signal Description
TTXD1
Serial output. This signal sends serial data to the communication link. The signal is
set to a marking state on hardware reset when the transmitter is empty or when
loop mode operation is initiated.
RRXD1
Serial input. This signal receives serial data from the communication link.
DDTR1#
Data Terminal Ready. This signal indicates to the modem or data set that the
on-board UART is ready to establish a communication link.
DDSR1#
Data Set Ready. This signal indicates that the modem or data set is ready to
establish a communication link.
RRTS1#
Request To Send. This signal indicates to the modem or data set that the on-board
UART is ready to exchange data.
CCTS1#
Clear To Send. This signal indicates that the modem or data set is ready to
exchange data.
DDCD1#
Data Carrier Detect. This signal indicates that the modem or data set has detected
the data carrier.
RRI1#
Ring Indicator. This signal indicates that the modem has received a telephone
ringing signal.