Sun Microsystems 60 service manual Cts

TABLE B-2Serial Port A and B Connector Pin Assignments (Continued)

Pin	Mnemonic	Signal Name	Description
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.

B-4Sun Ultra 60 Service Manual • August 2001