Mitsubishi GOT1000 Series Connection Manual page 614

3
Precautions when preparing a cable
The length of cables RS-232 2) and 3) must be 15m or less.
The length of the cable RS-232 1) must not exceed 15m including the CPU port/D-Sub 9-pin conversion
cable length.
16 - 10
16.2 Connection Cable
16.2.1 RS-232 cable