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RS232 3P(TXD)
RS232 5P(GND)
COM
STOP
DOWN
UP
RS232 interface settings:
bps::2400data bit:8parity check:nostop bit:1control code:up:0xff,0xee,0xee,0xddstop:0xff,0xee,0xee,0xccdown:0xff,0xee,0xee,0xee