OUMAN EH-800B serial port
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RJ45-2 port RS232 pinout (w/ T568B colors):

RJ45 pin8 (brown): OUMAN RX (HOST TX)
RJ45 pin7 (brown-white): OUMAN TX (HOST RX)
RJ45 pin1 (orange-white): GND

So RS232 SUB-D9 cable:

RJ45 pin7 -- D9 pin1 (rx)
RJ45 pin8 -- D9 pin2 (tx)
RJ45 pin1 -- D9 pin5 (gnd)

BAUD SETTINGS:
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9600 8N1
no flow control