CHAPTER 6
RS232 CABLING INFORMATION
6.1 DB25 Connector
The communication interface
follows the EIA RS232C standard. The signal assignments for a standard
DB25 connector are shown below:
To connect the PCCOM
4 port 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:
