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CHAPTER 6 RS232 & RS422 CABLING INFORMATION 6.1 RJ11 Connector The communication interface
follows the EIA RS232C standard. Each RS232 port has one RJ-11 female
connector for connection to a peripheral device. The board-mounted
female RJ-11 pin identification is shown in the following:
The RJ-11 to DB25
expansion cable assignment is shown in the following:
To connect PCCOM 8 port adapter
to other DATA TERMINAL EQUIPMENT (DTE) devices, the
developers recommend the following connection method.
6.2 DB25 ConnectorThe communication
interface follows the EIA RS232C standard. The signal assignments
for a standard DB25 connector are shown below:
To connect the PCCOM 8 port adapter to other
DATA TERMINAL EQUIPMENT (DTE) devices,
we recommend using a DTE to DTE connection as shown below :
ˇ@6.3 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.
6.4 Modem Connections A straight through cable is required, e.g. pin 2 to pin 2, pin 3 to pin 3, etc.
6.5 DB9 ConnectorThe signal
assignments for a standard DB9 connector are shown below:
To connect the RS422 to other
DATA TERMINAL EQUIPMENT (DTE) devices, the developers recommend using a
DTE to DTE connection as shown below.
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