Epson 4100 manual DTE/DCE Device Chart, DTE Device

Operator's Guide B-5

		DTE DEVICE
	Signal
Pin	Name	Function
1	Frame	Frame Ground
	Ground
	(FG)
2	Transmitted	Output. Data signal. Transmits
	Data (TxD)	serial data on this pin.
3	Received	Input. Data signal. Receives
	Data (RxD)	serial data on this pin.
4	Request To	Output. Control signal. DTE has
	Send	data to send and is requesting
	(RTS)	permission to transmit by placing
		this pin high.
5	Clear To	Input. Control signal. DTE looks
	Send	for a positive voltage on this pin
	(CTS)	as permission to transmit data.
6	Data Set	Input. Control signal from other
	Ready	RS-232-C device that lets DTE
	(DSR)	know that the other RS-232-C
		device is powered up.
7	Signal	Signal Ground. (Must be
	Ground	connected.)
8	Data	Input. Control signal from other
	Carrier	RS-232-C device that lets DTE
	Detect	know that circuit has been
	(DCD)	established.
20	Data	Output. Control signal. DTE
	Terminal	places positive voltage on this
	Ready	pin when powered up.
	(DTR)

	DCE DEVICE
	Signal
Pin	Name	Function
1	Frame	Frame Ground
	Ground
	(FG)
2	Transmitted	Input. Data signal. Receives
	Data (TxD)	transmitted data on this pin.
3	Received	Output. Data signal.
	Data (RxD)	Transmits serial data on this
		pin.
4	Request To	Input. Control signal. DCE
	Send	looks for positive voltage on
	(RTS)	this pin indicating other
		device has data to send.
5	Clear To	Output. Control signal. DCE
	Send	grants permission for other
	(CTS)	device to transmit data by
		placing positive voltage on
		this line.
6	Data Set	Output. Control signal. DCE
	Ready	places positive voltage on
	(DSR)	this pin when powered up.
7	Signal	Signal Ground. (Must be
	Ground	connected.)
8	Data	Output. Control signal. DCE
	Carrier	places positive voltage on
	Detect	this pin when circuit has been
	(DCD)	established.
20	Data	Input. Control signal from
	Terminal	other device that lets DCE
	Ready	know that other RS-232-C
	(DTR)	device is powered up.

DTE/DCE Device Chart