Solartron 1253A, Operating Manual

Page: 133 / 144

[Chapter 11]
1253 Op Man_DA
11.17
4 .2 LINE NUMBERING
Each learnt instruction can be numbered, for reference purposes or to enable the JP
(jump) command to be used. When in ‘program learn’ mode or ‘edit insert’ mode you
simply precede each command code by the required number (integer 1 to 98) e.g.
50 SG
Line 50 is then the ‘Stop Generator’ command
Line numbers always default to 00 (as seen in program edit mode when using the front
panel display) except the last line of a program, which is always:
99 *Q
The line numbers have no effect on the order of execution of the program and programs
must be learnt or edited into the order in which they are to be executed.
4 .3 REMOTE COMMAND STORAGE: GPIB
There are two methods of transferring Learnt Programs to an external device via the
GPIB port. The choice depends on the rate at which the Controller can handle data.
a.
Fast Method. The Learnt Program is transmitted by the 1253 at the rate of
approximately 1byte (i.e. one ASCII character) per millisecond. Provided that the
Controller rate is faster than this, the required Program is listed by the 1253 at its
maximum speed. An example Controller program for this method is shown below.
b. Slower Method. This method includes a ‘handshake’ routine to ensure that no data
is lost. A typical Controller program is shown below.
Controller Programs . The most commonly used Controller program statements are
defined in Chapter 8, the others are explained as they occur in the examples.
Note that the Learnt Program data fed to the GPIB will include an Output Terminator, as
explained in Chapter 8.