Campbell Scientific NL100 Network Link Interface - Manual (Page 13)

NL100/105 Network Link Interface
TcpSer - The NL105 acts as a serial server for the TLink port. A serial server
is a device that allows serial communication over a TCP/IP communications
link. When configured as a serial server, there is one parameter to set:
TLink Serial Server Port Number - Enter the port number, in the range of
3000 to 65000, that will be used for TLink communication. The default
port number is 6781.
232-Bridge - The NL105 transparently passes data between the TLink port and
its RS-232 ports. The 232-Bridge configuration has only one setting, RS-232
bps. This is the bits per second (bps) at which the NL105 will communicate
with the device connected to the RS-232 port. This is a fixed rate (i.e., it is not
a maximum baud rate or an autobaud rate). The default is 115k bps.
Disabled - The TLink communications port is disabled.
2.4.3.2 RS485 Config
This option is used to configure the NL100's RS485 port for communication
with an RS485 device. Campbell Scientific offers the MD485 for
communication with its dataloggers via RS485. The port can be configured for
PakBus communication, as a TcpSer serial server, or as a PakSer serial server.
PakBus - This option is used to set up the NL100/105 to communicate with
PakBus devices over the RS485 port. Packets transferred over the port in this
mode are framed as PakBus packets; therefore, any device attached to the port
must be configured for PakBus communication also. When a port is configured
for PakBus, the NL100/105’s “PakBus/Tcp Server Config” option must be
enabled (Section 2.4.3.7) or you will not be able to communicate with TCP/IP
through the NL100/105 to the PakBus devices on that port.
When configured for PakBus the NL100/105's RS485 port has the following
settings:
RS485 Bps - This option is used to set the bits per second (bps) at
which the NL100/105 will communicate using the RF485 port. The
default value is 38K.
RS485 Beacon Interval - The NL100/105 can be set to transmit a
beacon to a PakBus network via the selected port. The beacon allows
the NL100/105 to determine which devices in the PakBus network it
can communicate with. Note that because a beacon is broadcast to all
devices, it can interfere with other communication in the network
(such as RF), so a frequent beacon may not be desirable. If 0 is
entered, no beacon will be sent; the default beacon is 60 seconds.
RS485 Verify Interval - This is the interval at which a PakBus
communication link will be verified over the RS485 port. If
communication does not take place with a PakBus device within the
verify internal, a packet will be sent to test the communication link.
In most instances, this setting should be left at the default of 0, which
will set a verify interval of 2.5 times the Beacon Interval.
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