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PCI VelocityRS232/422/485
Serial Port Pin Outs.
The pinouts of the 9 pin Male D connectoris given below.
Figure 4-2. Serial Port RS232 Pin Outs.
PIN 6 - DATA SET READY (DSR)
PIN 7 - REQUEST TO SEND (RTS)
PIN 8 - CLEAR TO SEND (CTS)
PIN 9 - RING INDICATOR (RI)
9 Pin D Serial Port RS232 Cables.
To connect to the AT style RS232 Serial Port you will need a cable
terminating in a 9 way female D connector. It is sound practice to
use cables with screws fitted that will allow you to fasten the cable
securely to the PC card.
In general, you will need to make up a "cross over" cable to
correctly interface the PC to the RS232 port of another computer
or device. Traditionally, making up the cross over cable has been
considered a black art. However, provided you have the pin outs
and handshake requirements of both sides of your RS232
connection, the cross over cable becomes a matter of common
sense. The cross over cable is simply to ensure that the right
signals going out of one RS232 port go into the appropriate lines
of the other RS232 port.
PIN 1 - DATA CARRIER DETECT (DCD)
PIN 2 - RECEIVED DATA (RXD)
PIN 3 - TRANSMITTED DATA (TXD)
PIN 4 - DATA TERMINAL READY (DTR)
PIN 5 - GROUND (GND)
Chapter 4 Page 65
RS232 Pinouts & Cabling
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