70009 Parallax Inc, 70009 Datasheet - Page 87

• Manufacturer Part Number: 70009
• Description: BOOK UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc
• Type: Signal Analysisr

Specifications of 70009

• Style: Book
• Title: Understanding Signals
• Contents: Guide to Generate, View and Measure Wave Forms
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 70009PAR

ACTIVITY #2: DISPLAYING 8-BIT TRUE DATA
By changing the
data or inverted data. The
inverted) data at a baud rate of 9600. Look at the code snippets below:
Generally, when the signal level is RS-232, (roughly -12 to +12 VDC), inverted data is
specified. When the signal level is TTL, (roughly, 0 to 5 VDC), true data polarity is
specified. What complicates this issue is that RS-232 is normally inverted, so when we
invert normal RS-232, we get normal data. Get it? Don’t bother. Just be aware that RS-
232 comes in two flavors, and it’s good to have an OPTAscope to figure out which one
you are dealing with.
√
√
√
Set the Horizontal dial back to 500 µs.
Modify the program AsynchSerial.bs2 to send true data by changing the
command’s
Run the modified program.
'Inverted Data
SEROUT 14, 16468, [Value] 'Idle state = 0,
'True Data
SEROUT 14, 84,
SEROUT 14, 84, [Value]
Baudmode
Baudmode
argument, we can direct the BASIC Stamp to send normal
Baudmode
argument to read:
[Value] 'Idle state = 1,
argument
'logic 0 = 1
'logic 0 = 0
84
specifies 8-bit no-parity true (non-
logic 1 = 0,
logic 1 = 1,
SEROUT