BCM RX87Q - COM1 RS232;RS422;RS485 Select: JP1, JP2, JP3

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1.12.2 COM1 RS232/ RS422/ RS485 Select: JP2, JP3, JP4
These jumpers provide combinations for RS232 (default), or RS422, or RS485 transfer mode on COM1
(rear I/O).
1.12.3 COM1, COM2, COM3, COM4, COM5 and COM6 Ring-in/ +12V/ +5V
Power
Select: Com_JP1, COM_JP2, COM_JP3, COM_J4, COM_JP5,
COM_JP6
These headers provide ring-in, or 5V, or 12V on the com ports.