of the other device settings are valid and all other functionality is disabled. All settings (that is,
IP address, subnet mask, and default gateway) are configured in the data logger. However, in
bridge mode, the device will intercept any TCP traffic on the TCP configuration port number.
This allows the device to still be configured remotely by IP connection using Device
Configuration Utility. The TCP Configuration Port Number is a user setting with a default value
of 6786.
NOTE:
When the device is configured in bridge mode, it is not possible to open a telnet session
with it.
B.1.6 CS I/O IP Interface Identifier
When the device is configured to operate in bridge mode, the data logger will address the device
using this identifier. The data logger can address up to two CS I/O IP devices. The corresponding
CS I/O IP Address settings in the data logger will control the interface. CS I/O IP Interface 1 uses
SDC channel 3. CS I/O IP Interface 2 uses SDC channel 1.
B.1.7 Bridge Mode Forward Code
When the device is configured for bridge mode, it forwards Ethernet packets to the data logger.
Because the device is aware of the MAC address and IP address being used by the data logger, it
is able to do some filtering on incoming packets and only forward relevant packets. This
decreases the amount of traffic on the relatively bandwidth-limited CS I/O port and minimizes
the amount of Ethernet processing the data logger needs to perform.
It may be desired to further reduce the amount of CS I/O traffic. This setting allows the filtering
by the device to be customized to some degree. The default value of this setting is 65535 (0xFFFF
hex) and will forward all packets that have been determined to be relevant for proper data logger
IP communications. If desired, other codes may be entered to filter out certain packet types.
A packet is forwarded to the data logger if its corresponding bit is set in the Bridge Mode
Forward Code. It will not be forwarded if its corresponding bit is cleared. Single bits or multiple
bits may be cleared to accomplish custom filtering. The following are example values of this
code.
Forward Code Values
65535 (0xFFFF): Leave all bits set to forward all relevant packets.
65531 (0xFFFB): Clear bit 2 to forward all relevant packets except UDP Broadcast packets.
Filtering UDP broadcasts will disable the data logger ability to respond to Device Configuration
NL241 Wireless Network Link Interface
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