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20 DTE Interface Signals
CIRCUIT AB - SIGNAL GROUND
CONNECTOR NOTATION: DGND
DIRECTION: Not applicable
This conductor directly connects the DTE circuit ground to the DCE circuit ground.
CIRCUIT BA - TRANSMITTED DATA
CONNECTOR NOTATION: TXD
DIRECTION: To DCE
This signal transfers the data generated by the DTE through the communication channel
to one or more remote DCE data stations.
CIRCUIT BB - RECEIVED DATA
CONNECTOR NOTATION: RXD
DIRECTION: From DCE
This signal transfers the data generated by the DCE, in response to data channel line
signals received from a remote DTE data station, to the DTE.
CIRCUIT CA - REQUEST TO SEND
CONNECTOR NOTATION: RTS
DIRECTION: To DCE
This signal controls the data channel transmit function of the local DCE and, on a
half-duplex channel, the direction of the data transmission of the local DCE.
CIRCUIT CB - CLEAR TO SEND
CONNECTOR NOTATION: CTS
DIRECTION: From DCE
This signal indicates to the DTE whether the DCE is conditioned to transmit data on the
communication channel.