Veichi SI21 - Page 11

SI21 Solar Pump VFD Manual
9
● Function Specification of Switch Terminals
Bit
Select
location
Function Description
S1
ON
Enable AO output 0V～10V
OFF
Disabling AO voltage output
S2
ON
Enable AO output 0mA～20mA or 4mA～20mA
OFF
Disabling AO current output
S3
ON
RS485 communication access 120Ω termination resistor
OFF
RS485 communication disconnects 120Ω termination resistor
S4
I
AI input 0mA～20mA or 4mA～20mA
U
AI input 0V～10V