Tektronix 2230 Service Manual

Options—2230 Service
BINary, HEXADECIMAL, or ASCii. The resolution of data
points sent over the bus may be either 8 or 16 bits..
Waveform record length is 1024 or 4096, but the number
of data points per record depends on several variables.
See the description of NR.Pts in the Command Tables for
more information.
Binary Encoding
BINary data is transferred as an unsigned binary
integer. Each record is 8 bits, or 16 bits when averaged.
In BINary format, the waveform curve data is in the
form of: CURVE <space> % <Binary Count MSB>
<Binary Count LSB> <Data> <Checksum> cTermi-
nator>
Where:
% is used as a header character
to show the start of a binary
block.
<Binary Count MSB> is the most significant byte of
the two-byte Binary Count.
Binary Count is the length of
the waveform, in bytes, plus
the one byte Checksum.
<Binary Count LSB> is the least significant byte of
the Binary Count.
<Data> is made up of 256, 512, 1024,
2048 or 4096 data points.
Each data point is either a 1
byte (8-bit) or 2 byte (16-bit)
representation of each digi
tized value.
<Checksum> is the two's-complement of the
modulo 256 sum of the
preceding data bytes and the
binary count. The Checksum is
used by the controller to verify
that all data values have been
received correctly.
Table 7-26 shows an example of data sent over the
interface during a 4096 point, 8-bit BINary waveform
transfer. The actual waveform point (Pt.) values will vary
depending upon the signal acquired.
Table 7-27 shows an example of data sent over the
interface during a 4096 point, 16-bit BINary waveform
transfer.
Table 7-26
Typical 8-Bit Binary Waveform Data
Byte
Contents Decimal GPIB EOI
(1= Asserted)
1
C 67 0
2
U
85
0
3
R 82 0
4
V 86 0
5
E
69
0
6
<SP> 32
0
7
% 37
0
8
<Bin Count
MSB>
16a
0
9
<Bin Count
LSB>
01a
0
10
1st Pt
<Ji
0
11
2nd Pt
d2
0
.
0 •
.
0
.
0
4105
4096th Pt
^4096
0
4106 <Checksum>
chk
1 When
TERM = EOI
4l07b
<C R >
13 0
4108c <LF>
10
1
*(1001,, or 4097,0)
bAII RS-232-C or GPIB with TERM =- LF/EOI.
cRS-232-C with TERM = CR-LF.
Hexadecimal Encoding
In HEXadecimal waveform encoding, characters
representing an 8-bit or 16-bit data point are sent in a
fixed ASCII hexadecimal format. There are no delimiters
between data points. Data format is very similar to BINary
format, with the following exceptions:
1. The curve header is "CURVE #H" instead of
"CURVE %” .
2. Each data point is 2 ASCII hexadecimal characters
for 8-bit and 4 ASCII hexadecimal characters for 16-bit
transfers.
7-29

Tektronix 2230 Specifications

General

Brand	Tektronix
Model	2230
Category	Test Equipment
Language	English