Campbell Scientific MD485 RS-485 Multidrop Interface - Manual (Page 53)

Appendix D. Digital Cellular Modem to MD485 Network
Remote MD485s normally connect to datalogger CS I/O ports via SC12
cables. Powering up the datalogger will start the MD485 operating.
Connect the CABLE2TP cable between the RS-485 ports of the base and
remote MD485s and you are ready to connect to the datalogger.
D-9