Appendix
133
Appendix
D-sub 25-pin connector
Pin
Signal
Description
1
NC
—
2
NC
—
3
RSDM+
Data mode+
4
RSSD+
Send data+
5
RSST+
Send
6
RSRD+
Receive data+
7
RSRS+
Request to send+
8
RSRT+
Receive
9
RSTR+
Terminal ready+
10
RSTT+
Transmit
11
RSCS+
Clear to send+
12
RSRR+
Receive ready+
13
RSIC
Incoming call
14
GND
Ground
15
RSDM–
Data mode–
16
RSSD–
Send data–
17
RSST–
Send timing–
18
RSRD–
Receive data–
19
RSRS–
Request to send–
20
RSRT–
Receive timing–
21
RSTR–
Terminal ready–
22
RSTT–
Transmit timing–
23
NC
—
24
RSCS–
Clear to send–
25
RSRR–
Receive ready–
D-sub 37-pin connector
Pin
Signal
Description
1
NC
—
2
NC
—
3
NC
—
4
RSSD+
Send data+
5
RSST+
Send
6
RSRD+
Receive data+
7
RSRS+
Request to send+
8
RSRT+
Receive
9
RSCS+
Clear to send+
10
NC
—
11
RSDM+
Data mode+
12
RSTR+
Terminal ready+
13
RSRR+
Receive ready+
14
NC
—
15
RSIC
Incoming call
16
NC
—
Pin
Signal
Description
17
RSTT+
Transmit
18
NC
—
19
GND
Ground
20
NC
—
21
NC
—
22
RSSD–
Send data–
23
RSST–
Send timing–
24
RSRD–
Receive data–
25
RSRS–
Request to send–
26
RSRT–
Receive timing–
27
RSCS–
Clear to send–
28
NC
—
29
RSDM–
Data mode–
30
RSTR–
Terminal ready–
31
RSRR–
Receive ready–
32
NC
—
33
NC
—
34
NC
—
35
RSTT–
Transmit timing–
36
NC
—
37
NC
—