Campbell Scientific AVW200-series Vibrating Wire Interfaces - Manual (Page 106)

Appendix I. Using MD485 Multidrop Modems with AVW200 Interfaces
I.2 Connections
The point-to-point configuration is the simplest MD485-to-AVW200 network.
In this configuration, two MD485s are required (see FIGURE I-2).
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 (see FIGURE I-3).
18663 Null Modem Cable
CABLE2TP-L Cable
Datalogger MD485 AVW200 MD485
FIGURE I-2. Point-to-Point MD485-to-AVW200 Network
18663 Null Modem Cable
CABLE2TP-L Cable
AVW200 with a unique
PakBus Address
Datalogger MD485 MD485
MD485
AVW200 with a unique
PakBus Address
FIGURE I-3. Point-to-Multipoint MD485-to-AVW200 Network
I-2