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Hardware
Multi 4/8 V1.7
Multi-4U RS232 V1.7
There are jumpers for each port when opening the case. Users can select 1 of 2.
RI: Use 9th pin of DB9 connector as RI signal (Default)
Power: Use 9th pin of DB9 connector as +5V supply
2. Combo (RS422/RS485) Model
- DB9 Female Pin Assignment
