User`s manual

User’s Manual
30 ECM-5716 Series User’s Manual
3.7.15 Serial Port 2 Connector (JCOM2)
Signal PIN Signal
DCD 1 2 RXD
TXD 3 4 DTR
GND 5 6 DSR
RTS 7 8 CTS
NRI 9 10 NC
3.7.16 Signal Description – Serial Port 2 Connector in RS-232 Mode (JCOM2)
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.
3.7.17 Pin Header Serial Port 2 Connector in RS-422 Mode (JCOM2)
Signal PIN Signal
TX- 1 2 RX+
TX+ 3 4 RX-
GND 5 6 NC
NC 7 8 NC
NC 9 10 NC
3.7.18 Signal Description – Serial Port 2 in RS-422 Mode (JCOM2)
Tx +/- Serial output. This differential signal pair sends serial data to the communication link. Data is
transferred from Serial Port 2 Transmit Buffer Register to the communication link, if the RTS
register of the Serial Port 2 is set to LOW.
Rx +/- Serial input. This differential signal pair receives serial data from the communication link.
Received data is available in Serial Port 2 Receiver Buffer Register.