The RS423 and GPIB Ports. Remote Control 1250 Frequency Response Analyzer
13-28 AMK/1250/4
13.14.2 PROCEDURE FOR STORING A LEARNT PROGRAM EXTERNALLY,
VIA RS423 PORT
1. Ensure that the 1250 is in LOCAL 1 or LOCAL 2 mode.
2. Set up the relevant external device, connected to the RS423 port.
3. Instruct the 1250 to list the required Learnt Program by sending the Command:
*Pn
from the external device.
4. The contents of Program n will now be copied to the external device via the RS423
port.
13.14.3 PROCEDURE FOR LOADING A LEARNT PROGRAM INTO THE 1250,
VIA RS423 PORT
To re-load a Learnt Program into the 1250:
1. Follow steps 1 and 2 of Section 13.14.2.
2. Send the Command:
*Ln
from the external device.
3. The Program will be sent to the 1250 and stored under the Learnt Program number
n.
4. The Program can now be executed from the Front Panel in the normal way, or via
the RS423 port by sending the Command:
EPn
13.14.4 PROCEDURE FOR STORING A LEARNT PROGRAM EXTERNALLY,
VIA GPIB PORT
There are two methods of transferring Learnt Programs to an external device via the
GPIB port, depending upon the rate at which the Controller can handle data.
a. Fast Method. The 1250 transmits the Learnt Program at the rate of approximately
1 byte (i.e. one ASCII character) per millisecond. Provided that the Controller rate is
faster than this, the 1250 merely has to "list" the required Program at its maximum
speed. A typical Controller program for this method is shown in Section 13.14.5.
b. Slower Method. This method includes a "handshake" routine to ensure that no data
is lost. A typical Controller program is shown in Section 13.14.6.
Controller Programs. The most commonly used Controller program statements are
defined in Section 13.8; 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 Section 13.12.2.
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