Campbell Scientific AVW200 AVW200-series Vibrating Wire Interfaces - Page 108
I.2.3 MD485 to AVW200, I.2.4 Multiplexer Connections, I.3 Programming, I.3.1 Example Program, I.2.3
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Appendix I. Using MD485 Multidrop Modems with AVW200 Interfaces (-) (-) (+) (+) Connect at one end only to chassis GND. 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-4). 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: CR1000 MD485 MD485 AVW200 with PakBus Address: 1 MD485 AVW200 with PakBus Address; 5 18663 Null Modem Cable CABLE2TP Cable I-4