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1256E User Manual
Using the Front-Panel Controls 3-12
Racal Instruments
©
2002
example uses 170, which equals AA
16
, or an alternating 1/0
pattern:
----OPERATIONS----
Slot 03: -114TTL
Port 07: Write
<Set to : 170?
7.
Press the fourth key to confirm the change. The port output
then changes, and the display shows:
----OPERATIONS----
Slot 03: -114TTL
Port 07: Write
> Value: 170 <
Viewing a Digital Input Port
The 1256 front-panel controls allow the user to view the data
from input ports of digital I/O plug-ins. For example, suppose a
Model 1260-114TTL plug-in is installed in slot 3. Also suppose
that port 5 of this plug-in is configured as an input (see
Chapter
7, DIGITAL MODULE OPERATION
for configuration
instructions). To view the status of port 5, proceed as follows:
1. Press the top key next to the display. Rotate the knob until
the top line reads:
>----OPERATIONS----<
2. Select line 2 (next to the top line) by pressing the second
key. The display shows line 2 as being selected:
----OPERATIONS----
>Slot 01: 1260-121A<
Channel: 00
Status: Open
3.
Rotate the knob until line 2 shows the contents of slot 3:
----OPERATIONS----
>Slot 03: -114TTL <
Port 00: Write
Value: 255
4. Press the third key to select line 3 of the display (port
number):
----OPERATIONS----
Slot 03: -114TTL
>Port 00: Write <
Value: 255
5.
Rotate the knob until line 3 shows the desired port number,
which in this example is 5, and the desired mode, which is
Read: