CR1000 Manual - Campbell Scientific

Section 8. Operation
Figure 110: Tree Map
8.5.6 PakBus LAN Example
To demonstrate PakBus ® networking, a small LAN (Local Area Network) of
CR1000s can be configured as shown in figure Configuration and Wiring of
PakBus LAN (p. 358). A PC running LoggerNet uses the RS-232 port of the first
CR1000 to communicate with all CR1000s. All LoggerNet functions, such as send
programs, monitor measurements and collect data, are available to each CR1000.
CR1000s can also be programmed to exchange data with each other (the data
exchange feature is not demonstrated in this example).
8.5.6.1 LAN Wiring
Use three-conductor cable to connect CR1000s as shown in figure Configuration
and Wiring of CR1000 LAN (p. 358). Cable length between any two CR1000s must
be less than 25 feet (7.6 m). COM1 Tx (transmit) and Rx (receive) are CR1000
digital I/O ports C1 and C2 respectively; COM2 Tx and Rx are digital I/O ports
C3 and C4, respectively. Tx from a CR1000 COM port is connected to Rx of the
COM port of an adjacent CR1000.
357