WattMaster WM-WCC3-TGD-01B - Manual (Page 476)

10. RS-485 COMMUNICATIONS
WCC III Technical Guide 10-24
You must fi rst disconnect the 24VAC power and then disconnect the three-wire RS-485 communications loop connections before you can
attempt to remove or replace a RS-485 communications driver chip. Failure to do so may result in a damaged driver chip and/or damaged
circuit board(s).
Figure 10-36: Replacing the RS-485 Driver Chip(s) on the RTU-17 and TUC-2R Controller
Replacing RS-485 Driver Chips on RTU17, TUC-2R, and VAVZ II
Figure 10-37: Replacing the RS-485 Driver Chip(s) on the VAVZ II Controller