26
Upper device can’t
communication
with device
Incorrect
communication
address
Check if the setting address is
correct according to the definition
Incorrect
communication baud
rate
Check if the setting baud rate is
correct according to the definition
Communication link
haven’t connect with
terminal resistance
Check if has input 120
Ω
resistance
Communication link
been Interrupted
Check if the communication
shield is connect well with earth
Communication stop
Check if the communication
cable is disconnect
