Signal Description - Serial Port Connector (Com1, Jcom2, J422/485) - Avalue Technology ECM-945GSE User Manual

2.4.12.1 Signal Description – Serial Port Connector (COM1, JCOM2, J422/485)
Signal
Serial output. This signal sends serial data to the communication link. The signal is set to
TxD a marking state on hardware reset when the transmitter is empty or when loop mode
operation is initiated.
RxD Serial input. This signal receives serial data from the communication link.
Data Terminal Ready. This signal indicates to the modem or data set that the on-board
DTR
UART is ready to establish a communication link.
Data Set Ready. This signal indicates that the modem or data set is ready to establish a
DSR
communication link.
Request To Send. This signal indicates to the modem or data set that the on-board
RTS
UART is ready to exchange data.
Clear To Send. This signal indicates that the modem or data set is ready to exchange
CTS
data.
Data Carrier Detect. This signal indicates that the modem or data set has detected the
DCD
data carrier.
Ring Indicator. This signal indicates that the modem has received a telephone ringing
RI
signal.
Signal Description
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User's Manual