Com5/Com6 Matching Resistor Select Jumper; Com5/Com6 Ri/5V/12V Power Supply Select - JHCTech KMDA-2602 User Manual

2.3.4 COM5/COM6 Matching resistor Select Jumper

NOTE:JP2 is for COM5; JP4 is for COM6.

2.3.5 COM5/COM6 RI/5V/12V Power supply Select

NOTE: Pin 12 and 34 are for COM5; Pin 56 and 78 are for COM6.
Figure 2.9
Figure 2.10
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User's Manual