Campbell Scientific MD485 RS-485 Multidrop Interface - Manual (Page 63)

Appendix G. MD485 to AVW200
Interface
The MD485 is used with the AVW200 Interface for situations where wireless
communication is impractical and the distance between the AVW200 interfaces
needs to be extended. MD485 to AVW200 communications is only supported
with PakBus networking.
Both point-to-point and point-to-multipoint configurations are possible. The
point-to-point configuration is the simplest MD485-to-AVW200 network. In
this configuration, two MD485s are required (see Figure G-1).
The point-to-multipoint configuration uses several AVW200s. In this
configuration, you need one MD485 to connect with the datalogger and another
MD485 for each AVW200 in the network. Each AVW200 must have a
unique PakBus address.
RS-232 Null Modem Cable
RS-485
RS-232
Null Modem Cable
FIGURE G-1. MD485 to AVW200 Connection (point-to-point)
Hardware Requirements
a. MD485s
b. AVW200(s)
c. Null Modem Cables (CSI Item #18663); one null modem cable connects
the MD485 to the datalogger; another null modem cable is required for
each AVW200 in the network
d. CABLE2TP 2-twisted-pair cable with shield and Santoprene Jacket
G-1