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END
Error (ER)
END and Error
(EER)
Control and Indicators
Options
70/715 Parallel Buffer
•
The buffer reports END whenever it completes the operations required
by each command as previously indicated.
• When a TC is present and prior to END, the buffer indicates incorrect
data transfer to the VRU via an ER to the CCM. An ER is caused by
presence of data in the buffer at the end of the WT pulseo
If
disconnect and
error conditions occur simultaneously only ER is indicated to the CCM.
• The buffer indicates a concurrent END and Error condition by means of
the END and Error Report (EER).
• The operator controls and indicators for the buffer are located on the
CCM Control Panel
o
They consist of the following:
Data (white indicator)- This indicator lights whenever the buffer is
exchanging data signals with a remote device.
Select (patch panel) - The buffer is connected to any CCM Select
(SEL) line, and is thereby enabled if power is on.
When the buffer is
enabled, it responds to each SEL with BOP.
• The options are field installable and accomplished by simple wiring
changes and/or addition of a plug-in.
Non - VR U 0 peration - This option enables the buffer to modulate the
Answer Back Control A lead by using the TC as previously indicated. The
VRU cable is not supplied, and the DOP signal is strapped ono
Non-Phrase Operation -
If
the vocabulary in the VRU contains words
only and are repeated three times, then the buffer starts address transfer to
the VRU at the first Word Time (WT)o
If,
however, the vocabulary contains
phrases or more than sixty-three words (189 word vocabulary) then the
first address transferred to the VRU coincides with Phrase Time (PT).
4-14
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