4 Configuring the Serial Port Settings Ether232Plus User Guide
26 Precidia Technologies Inc. 02-CML000057
Flow control options are none, hardware, or software as described Table 4.3 .
To set or change the Port Setting:
1 Choose
Serial Port
from the Device Settings menu.
Table 4.3: Flow Control Options for Port Setting Parameter
Option Description
None
Default setting. No flow control enabled. Data may be lost due to
overflow during high speed communication.
h/w
(rts/cts)
Hardware handshaking uses the RTS/CTS (Request To Send/Clear
To Send) signal lines for flow control on the COM port. Hardware
handshaking works by altering voltage levels on these lines. When
the remote end is ready to receive data, it asserts the CTS signal to
tell the Ether232Plus to start transferring data. If the remote end is
unable to accept the data as fast as it is received from the
Ether232Plus, the remote end negates CTS, and the Ether232Plus
suspends data transfer. When the remote end is ready for more data,
it asserts CTS again.
When the Ether232Plus is ready to receive data, it asserts the RTS
signal. If the Ether232Plus cannot accept data as quickly as the
device is passing data, it negates RTS. The Ether232Plus asserts
RTS again when it is ready to resume receiving data. This setting
can be used for the majority of installations.
s/w
(xon/xoff)
Software handshaking requires that XON/XOFF characters are
asserted and obeyed on the COM port. XON is used by either the
Ether232Plus or the remote host to signal the other end to start
sending data. XOFF can also be used by either the Ether232Plus or
the remote host to signal the other to stop sending data.
N
OTE
: XON/XOFF characters included in a data transmission are
interpreted as flow control characters and will cause transmission
problems. This option is not recommended for binary data trans-
mission.
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