Parallax BASIC Stamp 2e - Page 336

XOUT - BASIC Stamp Command Reference
Page 334 • BASIC Stamp Programming Manual 2.0b • www.parallaxinc.com
module. To talk to a particular module, XOUT sends the appropriate
house code and unit code. The module with the corresponding code
listens for its house code again followed by a command (on, off, dim, or
bright).
X-10 signals are digital codes imposed on a 120 kHz carrier that is
transmitted during zero crossings of the AC line. To send X-10
commands, a controller must synchronize to the AC line frequency with
50
µs precision, and transmit an 11-bit code sequence representing the
command.
XOUT interfaces to the AC power-line through an approved interface
device such as a PL-513 or TW-523, available from Parallax or X-10
dealers. The hookup requires a length of four-conductor phone cable and a
standard modular phone-base connector (6P4C type). Connections are
shown in Figure 5.44.
P0
Vdd
10 k Ω
Bottom of power-line
interface (PL-513 or TW-523)
P1
Vss
1 2 3 4
Figure 5.44: XOUT Power-Line
Interface Circuit.
X-10
PROTOCOL DETAILS.