JHCTech PADR-M101 User Manual page 23

I/O interface included on the rear panel：
l 4*COM: DB9 2*RS232, 2*RS232/422/485
l 1*Mic, 1*Line out: 3.5mm phone jack
PADR-M101 Side view
Figure 2. 8
Figure 2. 9
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User's Manual