S&T Kontron 3.5"-SBC-WLU, User Manual, Page: 43 / 90

3.5"-SBC-WLU - User Guide, Rev. 1.8
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Signal Description
exchange data.
CTS Clear To Send, indicates that the modem or data set is ready to exchange data.
DCD Data Carrier Detect, indicates that the modem or data set has detected the data carrier.
RI Ring Indicator, indicates that the modem has received a ringing signal from the telephone
line.
TX+/- Transmitted Data differential pair sends data to the communications link.
RX+/- Received Data differential pair receives data from the communications link.
GND Power Supply GND signal