Measurement Computing Digital488 - Manual (Page 43)

Section 3 Command Descriptions
3.13
The Data Strobe output is pulse for approximately 50 microseconds after new
data is output on the selected port(s).
When the Digital488 is addressed to talk (R0) it asserts Inhibit, reads the data
from all ports, unasserts Inhibit and outputs the number of characters determined by the
Gn and Pn commands. Leading zeros are not suppressed and the bus terminators are
appended to the output. After output the Digital488 must be re-addressed to talk to
perform subsequent reads. EDR (R1) may also be used to capture data in this format.
Example:
OUTPUT 718;"F1X" select ASCII Character format
ENTER 718; A$ read data from the Digital488
DISP A$ display shows 4>6;
OUTPUT 718;"D1??2ZX" send 1??2 to the Digital488
ENTER 718; A$ read data from the Digital488
DISP A$ display shows 1??2
F2 Format - ASCII Binary
In the F2 format, the each data bit is described with an ASCII 0 or 1. Each byte is
formatted in two 4-bit multiples separated by semicolons.
F2 String Decimal Equiv F2 String Decimal Equiv
0000;0000
0 0000;1001 9
0000;0001 1 0000;1010 10
0000;0010 2 0000;1011 11
0000;0011 3 0000;1100 12
0000;0100 4 0000;1101 13
0000;0101 5 0000;1110 14
0000;0110 6 0000;1111 15
0000;0111 7 1000;0001 129
0000;1000 8 1111;1111 255