Appendix C. NL241 Settings
C-9
is asserted, but typically it is not necessary to change this setting from its
default (
enable
).
RS-232 TCP Timeout
This setting will determine how fast the device will time out on the open TCP
connection. For
Serial Server
and
MODBUS/TCP gateway
configurations,
the device will close the TCP connection if no activity is detected for the
timeout period. For the
TCP Client
configuration, the device will close the
TCP client connection if no activity is detected and then immediately open
another connection with the remote server. This behavior helps to ensure that
the connection is functional as the device does not know the frequency or
nature of the expected data. Set to
0
for no timeout (not recommended) (range
0 to 999 seconds).
RS-232 Always On
This setting controls whether the device is allowed to shut down the RS-232
port when it is not in use in order to conserve power. Typically, it is not
necessary to change this setting from its default (
Auto
).
Auto
Based on the RS-232 port configuration, the device will decide which of
the following two modes is more likely to be desired and will operate in
the according manner. If the port is configured to
TCP Serial Client
, the
device will choose RS-232
Always On
. Otherwise, the device will choose
Power Down Port When Inactive
, and it will allow the RS-232 port to
power down when not in use in order to conserve power.
Always On
The device will not power down the RS-232 port. The port will remain
active always. As a result, the processor cannot enter its lowest power
state. Keeping the port
Always On
may be necessary because when the
RS-232 port is powered down, there is a wake-up latency and the first few
bytes that come in on the port will be missed. If this behavior is
unacceptable, set this setting to
Always On
to keep the RS-232 port
always on.
Power Down Port when Inactive
The device will power down RS-232 when the port is inactive. If the
device is configured for
Serial Server
mode, the inactivity timeout is 40
seconds. If configured for
PakBus
, the device can use the PakBus
protocol’s link-state to do a more intelligent and effective inactivity
timeout. If communications are received on the port after it has been
powered down, there is a wake-up latency and the first few bytes will be
missed. PakBus has a built-in mechanism to deal with this, but if the
device is not configured for PakBus communications, the user must
decide if the application can accept this behavior. If this behavior is
unacceptable, set this setting to
Always On
. The power savings that the
device is able to achieve by powering down the RS-232 port are
significant as the processor is also able to go to a deeper sleep mode. In an
idle state with
Low Power Mode
enabled, an additional ~0.12W savings
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