Solvline USB Multiport - Manual (Page 30)

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Hardware Multi 4/8 V1.5 & 1.6
Multi-8U RS232 V1.5, V1.6
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