This bit-encoded variable indicates the current state
of the DTE leads on a V.35 Nx interface. This variable
is encoded as follows:
RTS 0x001
CTS 0x002
DTR 0x004
DSR 0x008
DCD 0x010
RI 0x020
TD 0x040
RD 0x080
EC 0x100
Note: There may be multiple bits set based on the current
state of the interface. If a bit is set, then the
corresponding DTE lead is active.