Mitsubishi Electric GOT2000 Series Connection Manual page 322

(b) When using KV-L20, KV-L21V
• Terminator setting switch
Set when carrying out RS-422 communication.
When multi-communication unit is a terminal
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6.2 Serial Connection
Terminator
setting switch
Port 1 (RS232)
Port 2
(RS232/RS422/RS485)
ON
OFF
ON
Settings
When multi-communication unit is not a terminal
OFF