CHAPTER 6
RS232 CABLING INFORMATION

6.1  DB25 Connector

The communication interface follows the EIA RS232 standard. The signal assignments for a standard DB25 connector are shown below:

               DB25

Pin  #     Signal Name

    RS-232C

    Name

     Signal

    Direction

 1  Chassis Ground(GND)

       AA

     Common

2  Transmit Data(TxD)

       BA

     Output

3  Receive Data(RxD)

       BB

     Input

 4  Request to Send(RTS)

       CA

     Output

 5  Clear to Send(CTS)

       CB

     Input

 6  Data Set Ready(DSR)

       CC

     Input

 7  Signal Ground(SG)

       AB

     Common

 8  Data Carrier Detect(DCD)

       CF

     Input

20 Data Terminal Ready(DTR)

       CD

    Output

22 Ring Indicator(RI)

       CE

    Input

25 - PIN D- SHELL

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.

If hardware handshaking is necessary, use the following cable:

Some serial devices have the buffer control signal on pin 19, in which case pin 6 on the host is connected to pin 19 on the remote device.

6.3 Modem Connections

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

6.4 DB9 Connector

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

 5  Chassis Ground(GND)

     AA

     Common

 7  Request to Send(RTS)

     CA

     Output

 8  Clear to Send(CTS)

     CB

     Input