GMV5 DC INVERTER VRF UNITS SERVICE MANUAL 
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Figure 4 Communication cable connection for IDUs and ODUs 
 
3. Communication Cable Connection Method and Procedure 
A. Communication cable connection between the IDUs and ODUs 
The communication cable between the IDUs and ODUs is connected via interface D1/D2 on the terminal 
block XT2. Connection modes for the single-module system and multi-module system are shown in the 
following figures.