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RS232 Pinouts and Port Cabling
The Quad Cable Pinouts
The Quad cable consists of a 37 way female D connector
attached to four 25 way Male D connectors. Each of the cables
carries 9 cores plus a sheath. Each of the 25 pin D connectors has 9
connections, based on the standard PC serial port configuration.
Figure 4-7, on the next page shows the 37 way female connector
pin numbers corresponding to each of the 4 separate port pin outs
and pin functions. Each cable is approximately 1 metre long and is
clearly marked as P1 for Port 1, P2 for Port 2 etc.
Figure 4-6. Quad Cable by 9 and 25 pin D Connector
37 way D connector Pinouts
Port
Port
#1
#2
3
26
2
25
21
7
22
8
20
6
5
28
1
24
4
27
23
9
NOTE: Pin 19 on the 37 pin D connector is not used.
Chapter 4 Page 42
Port
Port
#3
#4
12
35
11
34
30
16
31
17
29
15
14
37
10
33
13
36
32
18
PCI Quad / Lynx 8 Port RS232
Pin Function
Transmitted Data (TXD)
Received Data (RXD)
Request To Send (RTS)
Clear To Send (CTS)
Data Set Ready (DSR)
Ground (GND)
Data Carrier Detect(DCD)
Data terminal Ready (DTR)
Ring Indicator (RI)
9
25
Pin
Pin
3
2
2
3
7
4
8
5
6
6
5
7
1
8
4
20
9
22
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