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B-4 Sun Ultra 60 Service Manual • August 2001
5 CTS Clear To Send Used by the DCE to indicate if it is
ready to receive data from the DTE.
When CTS, DSR, RTS and DTR are
ON, the DCE is ready to transmit
data received from the DTE across
the communications channel. When
only CTS is ON, the DCE is ready to
accept dialing or control signals
only. When CTS is OFF, the DTE
should not transfer data across
TXD.
6 DSR Data Set Ready Used by the DCE to indicate if it is
ready to operate. When DSR is ON,
the DCE is connected to the line and
ready to exchange further control
signals to start data transfer.
7 Gnd Signal Ground
8 DCD Data Carrier Detect Used by the DCE to indicate it is
receiving a suitable signal from the
communications channel.
9 Not connected None.
10 Not connected None.
11 Not connected None.
12 Not connected None.
13 Not connected None.
14 Not connected None.
15 TRXC Transmit Clock Used by the DCE to provide timing
information to the DTE. The DTE
provides data on TXD in which the
transition of the bit corresponds to
the rising edge of the clock.
16 Not connected None.
17 RTXC Receive Clock Used by the DCE to provide timing
information to the DTE. The falling
edge of the clock corresponds to the
center of the data bit received on
RXD.
TABLE B-2 Serial Port A and B Connector Pin Assignments (Continued)
Pin Mnemonic Signal Name Description