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:
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.ˇ@
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:
