BASIC stamp manual v2.2

SEROUT – BASIC Stamp Command Reference
Page 426 • BASIC Stamp Syntax and Reference Manual 2.2 • www.parallax.com
themselves. Since the open baudmodes only drive in one state and float in
the other, there's no chance of this kind of short.
The polarity selected for SEROUT determines which state is driven and
which is open as in Table 5.113.
State (0) State (1) Resistor Pulled to
Inverted
Open Driven
Gnd (Vss)
Non-inverted
Driven Open
+5V (Vdd)
Table 5.113: Open Baudmode
States for all BS2 models.
Since open baudmodes only drive to one state, they need a resistor to pull
the networked line into the other state, as shown in Table 5.113 and in
Figure 5.40 and Figure 5.41.
Open baudmodes allow the BASIC Stamp to share a line, but it is up to
your program to resolve other networking issues such as who talks when
and how to detect, prevent and fix data errors.
BASIC
Stamp
I/O
Pin
Gnd
(Vss)
BASIC
Stamp
I/O
Pin
Gnd
(Vss)
To o t h er
devices
To o th er
devices
1 k Ω
Vdd
Figure 5.40: SEROUT Open-Drain
Circuit. This circuit is for use with
the Open, Non-inverted baudmode.