Racal Instruments 1256 Manual page 46

Publication No. 980855 Rev. A
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The 1256 front-panel provides control of the output ports of a
digital I/O plug-in. (For connector pin assignments of a plug-in,
refer to its user manual.)
For example, suppose a 1260-114TTL plug-in is installed in slot 3.
Also suppose that port 7 of this plug-in is configured as an output
(see Chapter 7, DIGITAL MODULE OPERATION for configuration
instructions). To change the output of port 4, 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 second key.
The display shows line 2 as being selected:
----OPERATIONS----
>Slot 01: 1260-121A<
Channel: 0
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 7, and the desired mode, which is
Write:
----OPERATIONS----
Slot 03: -114TTL
>Port 07: Write
Value: 255
Line 4 now shows the current states of the eight bits of port
7, expressed as an eight-bit decimal number. By default, the
display uses decimal notation. To change the notation to
hexadecimal or binary, refer to the Display Format section
in this chapter, under the Settings heading.
6. Press the fourth key to select line 4. Rotate the knob until
line 4 shows the desired data to write to the port. This
example uses 170, which equals AA
1256 User Manual
<
<
<
, or an alternating 1/0
16
Using the Front-Panel Controls 3-11