Campbell Scientific CR3000 Micrologger - Manual (Page 362)

Section 8. Operation
362
Figure 112: Flat Map
Figure 113: Tree Map
8.5.6 PakBus LAN Example
To demonstrate PakBus ® networking, a small LAN (Local Area Network) of
CR3000s can be configured as shown in figure Configuration and Wiring of
PakBus LAN
(p. 363).
A PC running LoggerNet uses the RS-232 port of the first
CR3000 to communicate with all CR3000s. All LoggerNet functions, such as send
programs, monitor measurements and collect data, are available to each CR3000.
CR3000s 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 CR3000s as shown in figure Configuration
and Wiring of CR3000 LAN
(p. 363).
Cable length between any two CR3000s must
be less than 25 feet (7.6 m). COM1 Tx (transmit) and Rx (receive) are CR3000
digital I/O ports C1 and C2 respectively; COM2 Tx and Rx are digital I/O ports
C3 and C4, respectively. Tx from a CR3000 COM port is connected to Rx of the
COM port of an adjacent CR3000.