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5-12-6
GPIB TRANSACTIONS
Two examples of GPIB transactions showing the ASCII Character String to
be transmitted followed by the necessary BUS operations to complete the
transactions are shown below.
These examples were generated and
executed using a GPIB controller that uses an ANSI Standard Basic
Interpreter with enhancements allowing direct communication over GPIB
using special GPIB interface hardware.
In the examples. the ASCII
Character String to be transmitted is shown first. followed by the bus
operations required to complete the transaction.
A.
Example No. 1 - Instruct the FM/AM-1200S/A to set the RF to 500 MHz.
1.
ASCII String:
line feed.)
"RFF- 500" (Followed by carriage return and
2.
BUS Transaction:
UNT, UNL. MTA. DAB "R". DAB"-"
DAB "5", DAB
"0", DAB "0", DAB CR. DAB LF.
B.
Example No. 2 - Instruct the FM/AM-1200S/A to return the RF Attenua-
tion.
1.
ASCII String:
"RFF?"
2.
BUS Transaction:
a.
Output Cycle- UNT. UNL, MLA. MTA. DAB "R". DAB "F", DAB
"?",DAB CR. DAB LF.
b.
Input Cycle- UNT, UNL. MLA. MTA, DAB "1". DAB "0", DAB CR.
DAB LF.
The Input Cycle shows the RF Attenuation to be -10 dB.
5-12-7
ASCII OUTPUT COMMANDS TO THE FM/-1200S/A
All input commands sent to the FM/AM-1200S/A are placed in an internal
queue that will accommodate up to 128 bytes of data.
Command Strings
may be packed together. but the individual commands must be separated
by delimiters.
The delimiters are:
ASCII COLON ":"
ASCII PERIOD "."
ASCII QUESTION MARK "?"
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