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PCI Photon 4 Port RS232
The Photon 4 Port RS232 Cable Pinouts
The Photon 4 Port RS232 cable consists of a 37 way
female D connector attached to four either 25 or 9 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. Photon 4 Port RS232 Cable by 9 & 25 pin
D Connector
37 way D connector Pinouts
Port
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.
Port
#3
#4
12
35
Transmitted Data (TXD)
11
34
Received Data (RXD)
30
16
Request To Send (RTS)
31
17
Clear To Send (CTS)
29
15
Data Set Ready (DSR)
14
37
10
33
DataCarrier detect(DCD)
13
36
Data terminal Ready (DTR)
32
18
RS232 Pinouts and Cabling
Pin Function
Ground (GND)
Ring Indicator (RI)
Chapter 4 Page 43
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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