Apollo ESP6000 User Manual page 30

ECM-3612
2.3.6.1 Signal Description –Serial Port 3/4/1 Connector in RS-232 Mode (CM1, CM3,
CM2)
Signal
TxD
RxD
DTR
DSR
RTS
CTS
DCD
RI
30 ECM-3612 User's Manual
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.
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 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 communication link.
Request To Send. This signal indicates to the modem or data set that the
on-board UART is ready to exchange data.
Clear To Send. This signal indicates that the modem or data set is ready to
exchange data.
Data Carrier Detect. This signal indicates that the modem or data set has
detected the data carrier.
Ring Indicator. This signal indicates that the modem has received a telephone
ringing signal.
Signal Description