Racal Instruments 1257 Manual page 41

Using the Front Panel Controls 3-8
----OPERATIONS----
Drawer: 1260-CDS
>Channel: 100
Status: Open
3. Rotate the knob until line 3 shows the desired relay channel
number, which in this example is 104:
----OPERATIONS----
Drawer: 1260-CDS
>Channel: 104
Status: Open
4. Press the fourth key to select line 4. Rotate the knob until
the display reads:
----OPERATIONS----
Drawer: 1260-CDS
Channel: 104
<Set to?: Closed
5. Press the fourth key again to confirm the closure of the relay
channel. The relay then closes, and the display indicates the
updated status on line 4:
----OPERATIONS----
Drawer: 1260-CDS
Channel: 104
> Status: Closed
Opening a Relay
To open a relay, follow the steps given in the above section,
Closing a Relay, except in step 6 rotate the knob until line 4
(bottom line) of the display reads as shown below:
----OPERATIONS----
Drawer: 1260-CDS
Channel: 104
<Set to?: Open
Then press the fourth key to open the relay.
Viewing Relay States
It is easy to view the states of the relay channels on a switch
plug-in by using the OPERATIONS menu:
1. Press the top key next to the display. Rotate the knob until
the top line reads:
>----OPERATIONS----<
2. Press the third key to select line 3 of the display (channel
1257 User Manual
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