I.2.3 md485 to avw200, I.2.4 multiplexer connections, I.3 programming – Campbell Scientific AVW200-series Vibrating Wire Interfaces User Manual

Page 108: I.3.1 example program, I.2.3, I.2.4, I.3.1, Figure, N figure i-5

Appendix I. Using MD485 Multidrop Modems with AVW200 Interfaces

FIGURE I-5. MD485-to-MD485 Connections and Grounding

I.2.3 MD485 to AVW200

The 18663 Null Modem Cable is used to connect an MD485 with an AVW200.

One end of the null modem cable attaches to the RS-232 port on the MD485,

and the other end attaches to the RS-232 port on the AVW200 (see FIGURE

I.2.4 Multiplexer Connections

Multiplexers can be used in this configuration but the AVW200 has to control

the multiplexers. Refer to Section 4.5.1, AVW200 Controlling the Multiplexer,

for information on connecting the multiplexers.

I.3 Programming

An AVW200() instruction is entered for each AVW200. The ComPort

parameter needs to be ComRS232.

I.3.1 Example Program

The example is for a network that looks like the following:

18663 Null Modem Cable

CABLE2TP Cable

AVW200 with

PakBus Address: 1

CR1000

MD485

AVW200 with

PakBus Address; 5

Connect at one

end only to

chassis GND.

(-)

(+)

(-)

(+)

I-4