6 pakbus lan example, 1 lan wiring, Table 79. cr800 telecommunications options – Campbell Scientific CR800 and CR850 Measurement and Control Systems User Manual
Page 341
Section 8. Operation
341
8.5.6 PakBus LAN Example
To demonstrate PakBus
®
networking, a small LAN (Local Area Network) of
CR800s can be configured as shown in figure Configuration and Wiring of
PakBus LAN
(p. 341).
A PC running LoggerNet uses the RS-232 port of the first
CR800 to communicate with all CR800s. All LoggerNet functions, such as send
programs, monitor measurements and collect data, are available to each CR800.
CR800s 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 CR800s as shown in figure Configuration
and Wiring of CR800 LAN
(p. 341).
Cable length between any two CR800s must be
less than 25 feet (7.6 m). COM1 Tx (transmit) and Rx (receive) are CR800
digital I/O ports C1 and C2 respectively; COM2 Tx and Rx are digital I/O ports
C3 and C4, respectively. Tx from a CR800 COM port is connected to Rx of the
COM port of an adjacent CR800.
Figure 106: Configuration and wiring of PakBus LAN
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