Figure D - 2: Wiring Details of the RS-485 between 3 or more Hydran M2-Xs 
 
 
Figure D - 3: Wiring of the Supervisory Link between a Hydran M2-X and a Hydran 201Ci-1 Controller 
 
Note:  The Hydran 201Ci-1 Controller can only display the gas level measured by the 
Hydran M2-X, not the moisture level. 
Note:  Use the same wiring to connect the optional TDM terminal block to a Hydran 
201Ci Controller.  If the RS-485 link is already connected to the controller as shown in 
the above figures, connect only the optional TDM terminal block as directed.