Advantech AIMB-250 User Manual

50 AIMB-250 Series User’s Manual 
 

 

 

 

DCD 

1 

2 

RxD 

TxD 3 

4 

DTR 

GND 

5 

6 

DSR 

RTS 7 

8 

CTS 

RI 

9 

10 

NC 

 

 

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.