ECM-3612

2.3.6.1Signal Description –Serial Port 3/4/1 Connector in RS-232 Mode (CM1, CM3, CM2)

 

Signal

 

Signal Description

 

 

 

 

 

 

Serial output. This signal sends serial data to the communication link. The signal

 

TxD

 

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30 ECM-3612 User’s Manual