Chapter 2 – Hardware Information11Fanless Embedded Box PC BOXER-6638U2.4.1 UIM Socket (CN15)Pin Pin Name Signal Type Signal Level1 UIM_PWR PWR2 UIM_RST IN3 UIM_CLK IN4 GND GND5 UIM_VPP PWR6 UIM_DAT I/O2.4.2 COM Port 1/ 2/ 3/ 4 (CN33B/CN33A/CN29/CN28)COM 1 & 3/ COM 2 & 4 (RS-232)Pin Pin Name Signal Type Signal Level1 DCD IN2 RX IN3 TX OUT ± 9V4 DTR OUT ± 9V5 GND GND6 DSR INCN33BCN33A