Intel ECB-865 user manual Gnd Dtr Cts

User’s Manual

3.11.15Serial Port 1 / Serial Port 2 with External DB9 Connector (J9, J12)

Signal	PIN		Signal
GND	5
		9	RI
DTR	4
		8	CTS
TxD	3
		7	RTS
RxD	2
		6	DSR
DCD	1

3.11.16Signal Description – Serial Port 1 / Serial Port 2 in RS-232 Mode (J9, J12)

TxD	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.
RxD	Serial input. This signal receives serial data from the communication link.
DTR	Data Terminal Ready. This signal indicates to the modem or data set that the on-board UART
	is ready to establish a communication link.
DSR	Data Set Ready. This signal indicates that the modem or data set is ready to establish a
	communication link.
RTS	Request To Send. This signal indicates to the modem or data set that the on-board UART is
	ready to exchange data.
CTS	Clear To Send. This signal indicates that the modem or data set is ready to exchange data.
DCD	Data Carrier Detect. This signal indicates that the modem or data set has detected the data
	carrier.
RI	Ring Indicator. This signal indicates that the modem has received a telephone ringing signal.

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