Mitsubishi Serial Connections (4-wire or 2-wire data) – Mitchell Electronics Inc

Mitsubishi uses a few standard feedback connections for their serial encoders, however, it's important to know that there are now two main wiring setups that can be used with these feedback connections. The main differences are whether the encoder is using the legacy 4-wire setup for the data lines (SD+/-, RQ+/-), or the newer 2-wire setup (MR/MRR). Each option typically requires a different test cable. Unfortunately, the encoder model is often of little help as we have documented encoders with the same model using either of the wiring setups listed below. To make matters even more confusing, some encoders may even work with both cabling options depending on what year they were made as shown in the graph below for our two 10 pin DDK test cables.

The physical wiring is a great way to determine support if you can manage to see it. As you can see from the wiring below, there is no concern for trying either test cable if you are not sure, as they share the same power (P5) and ground (LG) pins. The motor model is another good indicator of which setup to use. For instance, the newest HG series of Mitsubishi servo motors all use the modern 2-wire serial data options.