CHAPTER 6
RS232 CABLING INFORMATION

6.1  DB9 Connector

The communication interface follows the EIA RS232 standard.  The signal assignments for a standard DB9 connector are shown below:

DB9
Pin  #     Signal Name
 RS-232C
Name		 Signal
Direction
 2  Receive Data(RxD) BB
 Input
 3  Transmit Data(TxD) BA
 Output
 4  Data Terminal Ready(DTR) CD
 Output
 5  Signal Ground(SG) AB Common
 6  Data Set Ready(DSR) CC
 Input
 7  Request to Send(RTS) CA
 Output
 8  Clear to Send(CTS) CB
 Input

To connect the PCCOM adapter to other DATA TERMINAL EQUIPMENT (DTE) devices, we recommend using a DTE to DTE connection as shown below:




6.2 Null Modem Connections: RS232
If the software supplier or operating system does not specify a particular cable configuration, we recommend you use the following ˇ§null modemˇ¨ cable when XON/XOFF is utilized.

HOST
 REMOTE
2 3
3
 2
4
 4
5
 5
6
 6
7
 7
8
 8

If hardware handshaking is necessary, use the following cable:

HOST
 REMOTE
2 3
3
 2
4
 6
6
 4
5
 5
7
 7
8
 8


6.3 Modem Connections
A straight through cable is required, e.g. pin 2 to pin 2, pin 3 to pin 3, etc.

HOST
 REMOTE
2 2
3
 3
4
 4
5
 5
6
 6
7
 7
8
 8