Register 1 Register 1 controls the input of the RS-232 communications port as described in Table 2 . Table 2 Settings for register 1 Field Description Octal Values BRKINT If BRKINT is set, break is mapped to SIGINTR. On Windows-based systems this field is forced by the system to be set. 000002 = set 000000 = not set ISTRIP If ISTRIP is set, it strips the 8th bit (8th bit is not read). This bit cannot be set on UnMux systems. 000000 = not set IGNCR If IGNCR is set, a received CR character is ignored (not read). 000200 = set 000000 = not set ICRNL If IGNCR is not set and ICRNL is set, a received CR character is translated into a NL character. 000400 = set 000000 = not set INLCR If INLCR is set, a received NL character is translated to a CR character. 000100 = set 000000 = not set IGNBRK If IGNBRK is set, a break condition detected on input is ignored, that is, not put on the input queue and therefore not read by any process. 000001 = set 000000 = not set IGNPAR If IGNPAR is s