Quatech user manual RS-232 Port Signal, QSC-100 connector pinouts

The QSC-100 is a DTE device which connects to peripheral equipment through a single female D-37 connector, or using the adapter cable, four male D-25 connectors. The standard serial port connections are listed in Figure 17.

RS-232	Port 1		Port 2		Port 3		Port 4
Signal	D-37	D-25	D-37	D-25	D-37	D-25	D-37	D-25
TxD	24	2	10	2	33	2	19	2
RxD	5	3	28	3	14	3	37	3
RTS	23	4	9	4	32	4	18	4
CTS	4	5	27	5	13	5	36	5
DTR	21	20	7	20	30	20	16	20
DSR	22	6	8	6	31	6	17	6
DCD	2	8	25	8	11	8	34	8
RI	20	22	6	22	29	22	15	22
GND	3	7	26	7	12	7	35	7

Figure 18 --- QSC-100 connector pinouts

1		13
2	20	25
		12
3	21	24
		11
4	22	23
		10
5	23	22
		9
6	24	21
		8
7	25	20
		7
8	26	19
		6
9	27	18
		5
10	28	17
		4
11	29	16
		3
12	30	15
		2
13	31	14
		1
14	32	D-25 connector
	33
15		(using adapter cable)
16	34
17	35
18	36
19	37
	D-37 connector
	(dashed lines delineate channels)

Figure 19 --- QSC-100 output connectors

Quatech QSC-100 User's Manual 25