User`s manual

ECM-5716 Series
ECM-5716 Series User’s Manual 23
3.7.3 Signal Description – Serial Port 1 Connector (COM1)
TxD Serial output. This signal sends serial data to th
e 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 dat
a set has detected the data
carrier.
RI Ring Indicator. This signal indicates that the modem has received a telephone ringing signal.
3.7.4 CPU Fan Connector (FAN1)
SIGNAL PIN
TAC 3
+12V 2
GND 1
3.7.5 Signal Description – CPU Fan Connector
TAC Fan speed monitor