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AT QUAD AND LYNX RS232
Serial Port Pin Outs.
The pinouts of the 9 and 25 pin Male D connectors are given
below.
Figure 4-2. Serial Port RS232 Pin Outs.
9 Pin connector:
P IN 6 - D ATA S E T R E A DY (D SR )
PIN 7 - R E Q U E ST T O SE N D (R X D )
P IN 8 - C L E A R T O S E N D (C T S )
P IN 9 - R IN G IN D IC ATO R (R I)
25 Pin connector:
PIN 20 - R IN G IN D IC ATO R (R I)
PIN 22 - DATA T E R M IN A L R E A DY (D T R )
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
RS232 Pinouts and Port Cabling
P IN 1 - D ATA C A R R IE R D E T E C T (D C D )
P IN 2 - R E C E IV E D D ATA (R X D )
P IN 3 - T R A N S M IT TE D D ATA (T X D )
P IN 4 - D ATA T E R M IN A L R E A D Y (D T R )
P IN 5 - G R O U N D (G N D )
P IN 2 - T R A N S M IT T E D D ATA (T X D )
P IN 3 - R E C E IV E D D ATA (R X D )
P IN 4 - R E Q U E ST T O S E N D (R X D )
P IN 5 - C L E A R T O S EN D (C T S )
P IN 6 - D ATA SE T R E A DY (D SR )
P IN 7 - G R O U N D (G N D )
P IN 8 - D ATA C A R R IE R D E T E C T (D C D )
Chapter 4 Page 37
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