FCMND program instruction 106 Read modem control flags. Modem control flags are returned in the first byte of a one-byte string. Bits within that byte show the current state of the modem control lines for the serial port attached to the lun specified in the FCMND instruction. The bits are interpreted as follows (LSB is 1): eV+Language Reference Guide, v2.x, 18319-000 Rev A Page 222 Bit Mask State of: 1 ^H01 Request to Send (RTS) 2 ^H02 Data Terminal Ready (DTR) 5 ^H10 Input Clear to Send (CTS) 6 ^H20 Input Data Carrier Detect (DCD)