Motorola MVME177 manual Table A-1. EIA-232-D Interconnections

A

EIA-232-D Interconnections

Table A-1. EIA-232-D Interconnections

Pin	Signal
Number	Mnemonic	Signal Name and Description
01		Not used.
02	TxD	TRANSMIT DATA. Data to be transmitted; input to the modem
		from the terminal.
03	RxD	RECEIVE DATA. Data which is demodulated from the receive
		line; output from the modem to the terminal.
04	RTS	REQUEST TO SEND. Input to the modem from the terminal
		when required to transmit a message. With RTS off, the modem
		carrier remains off. When RTS is turned on, the modem
		immediately turns on the carrier.
05	CTS	CLEAR TO SEND. Output from the modem to the terminal to
		indicate that message transmission can begin. When a modem is
		used, CTS follows the off-to-on transition of RTS after a time
		delay.
06	DSR	DATA SET READY. Output from the modem to the terminal to
		indicate that the modem is ready to transmit data.
07	SIG-GND	SIGNAL GROUND. Common return line for all signals at the
		modem interface.
08	DCD	DATA CARRIER DETECT. Output from the modem to the
		terminal to indicate that a valid carrier is being received.
09-14		Not used.
15	TxC	TRANSMIT CLOCK (DCE). Output from the modem to the
		terminal; clocks data from the terminal to the modem.
16		Not used.
17	RxC	RECEIVE CLOCK. Output from the modem to the terminal;
		clocks data from the modem to the terminal.
18, 19		Not used.
20	DTR	DATA TERMINAL READY. Input to the modem from the
		terminal; indicates that the terminal is ready to send or receive
		data.
21		Not used.

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