Epson 4100 manual EIA RS-232-C Pin Assignments, DTE Device DCE Device Pin # Signal Abbreviation

Operator's Guide B-3

DTE Device					DCE Device
Pin #		Signal	Abbreviation		Pin #
1		Frame Ground	FG		1
2	%	Transmitted Data	TxD	%	2
3	&	Received Data	RxD	&	3
4	%	Request To Send	RTS	%	4
5	&	Clear To Send	CTS	&	5
6	&	Data Set Ready	DSR	&	6
7		Signal Ground	SG		7
8	&	Data Carrier Detect	DCD	&	8
9	&	Pos. DC Test Voltage	+V	&	9
10	&	Neg. DC Test Voltage	-V	&	10
11	&	Equalizer Mode	QM	&	11
12	&	Sec. Data Carrier Detect	(S)DCD	&	12
13	&	Sec. Clear To Send	(S)CTS	&	13
14	%	Sec. Transmitted Data	(S)TD	%	14
15	&	Transmitter Clock	TC	&	15
16	&	Sec. Received Data	(S)RD	&	16
17	&	Receiver Clock	—	&	17
18		Unassigned			18
19	%	Sec. Request To Send	(S)RTS	%	19
20	%	Data Terminal Ready	DTR	%	20
21	&	Signal Quality Detect	SQ	&	21
22	&	Ring Indicator	RI	&	22
23	%	Data Rate Selector	—	%	23
24	%	Ext. Transmitter Clock	(TC)	%	24
25		Unassigned	—		25

EIA RS-232-C Pin Assignments