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158 Sun Enterprise 220R Server Owner’s Guide • October 1999
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.
18 Not connected None.
19 Not connected None.
20 DTR Data Terminal
Ready
Used to control switching of the DCE to the
communications channel.
21 Not connected None.
22 Not connected None.
Pin Mnemonic Signal Name Description