Campbell Scientific NL200/NL201 Network Link Interface - Manual (Page 15)

NL200/201 Network Link Interface
4. Overview
The NL200/201 Network Link Interface is a device used to communicate with
Campbell Scientific dataloggers and peripherals using an Ethernet 10/100
Mbps communications link. The NL200/201 includes a CS I/O port and an
RS-232 port for communication. A USB device port is used for configuring
the NL200/201 device.
FIGURE 4-1. NL201
Bridge Mode Enabled
The NL200/201 can be configured to bridge Ethernet and CS I/O
communications (Bridge Mode enabled). This mode is used for providing
access to the internal IP functionality of the CR800/850, CR1000, and CR3000
(e.g., web page access, email, FTP, etc.). Bridge mode does not utilize PPP.
Instead, raw IP packets are transferred between the Ethernet and CS I/O
connections.
FIGURE 4-2. Bridge Mode enabled
Bridge Mode Disabled
With Bridge Mode disabled, the NL200/201 can provide multiple services
simultaneously including TCP Serial Server, TCP Serial Client, Modbus
TCP/IP Gateway, and PakBus® router. The NL200/201 can act as a serial
server and PakBus router simultaneously. However, each physical port (RS-
232 and CS I/O) is only associated with one service (PakBus router, serial
server, Modbus/TCP Gateway, etc.) at a time. For example, you can have an
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