Interface Signals

Functional descriptions of the RS-449 interface signals are provided in TABLE A-2.

TABLE A-2	RS-449 Interface Signals

RS-449 Pin
No.	Signal Name	Function

1	Shield Ground	Enables tandem sections of shielded cable to retain continuity
		through the connector.
19	Signal Ground (SG)	Directly connects the DTE circuit ground to the DCE circuit
		ground, providing a path for DTE and DCE signal commons.
4/22	Transmit Data (TxD)	Used by the DTE to pass binary data to the DCE for
		transmission over the communications channel.
6/24	Receive Data (RxD)	Used by the DCE to pass binary data received from the
		communications channel to the DTE.
5/23	Transmit Clock in (TxCI)	Enables the DCE to transmit signal element timing to the DTE.
		This enables the DTE Transmit Data signal on circuit TxD to be
		in synchronization with On/Off transitions on this lead.
8/26	Receive Clock (RxC)	Transitions on this lead enables the DTE to time data received
		over circuit RxD.
17/35	Transmit Clock (TxC)	Enables the DTE to provide transmit timing information to the
		DCE so that the DTE can synchronize with data arriving over
		the TxD lead.
7/25	Request to Send (RTS)	Used by the DTE to advise the DCE it is ready to transmit data.
9/27	Clear to Send (CTS)	Used by the DCE to advise the DTE that the DCE is ready to
		send data over the communications channel.
11/29	Data Set Ready (DSR)	Used to advise the DTE of the Ready status on the DCE. In
		most cases, this signal simply implies the unit is powered on.
12/30	Data Terminal Ready (DTR)	Used by the DTE to advise the DCE it is ready to transmit or
		receive.
13/31	Data Carrier Detect (DCD)	The DCE uses this lead to advise the DTE that an incoming
		signal on the communications channel is present. When first

initialized this signal is an indication to the DTE to expect data momentarily.

Appendix A Cable Pin Assignments & Signals

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Sun Microsystems 819-1207-11 manual RS-449 Interface Signals

Models: 819-1207-11