Mitsubishi Electric MELSERVO-J4 Series Transition Handbook page 298

Part 6: Review on Replacement of MR-J3-_T_(DIO command/ Serial communication operation) with MR-J4-_A_-RJ
Function
Serial communication
BCD input
MR-J3-_T_
(DIO command/Serial communication operation)
Serial communication function of RS-422, this
servo amplifier enables servo operation,
parameter change, monitor function, etc.
When MR-J3-D01 is mounted, position command
input data can be input in 3-digit BCD format.
You can operate servo driving, parameter change,
monitor function, etc. using RS-422
communication (Mitsubishi Electric general-
purpose AC servo protocol).
Select "equivalent to MR-J3-T" with [Pr. PT01].
Refer to section 4.1 for details.
When MR-D01 is mounted, position command
input data can be input in 3-digit BCD format.
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MR-J4-_A_-RJ