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2. 12. 1. 17 Call Request Light
On
systems with the auto call feature installed, this light
indicates that the communication adapter has received an
SIO auto call instruction and is performing an auto call
operation.
2.12.1.18 Data Line In Use Light
On systems with the auto call unit installed, the DT LINE
IN USE light indicates that the data line occupied line from
the auto call unit is on.
2.12.1.19 Test Mode Light
This light indicates that the program has placed the adapter
in a test mode of operation.
2.12.1.20 External Test Switch Light
The EXT TEST SW light indicates that the switch at the
data set end of the medium speed data set cable is in the
test position. For high speed data sets, this indicator is
2-28
(1/71)
active when the local test switch on the CE panel is in the
on position.
2. 12. 1.21 Rate Select Switch
This switch, which is present only on systems installed out-
side the U.S.A. that have the rate selection feature as well,
controls the rate of transmission and reception of data.
2. 12. 1.22 BSCA Step Key
The BSCA STEP key, which is effective only when the
communication adapter is in step mode, causes the com-
munication adapter to advance one bit-time for each key
depression.
2.12.1.23 Local Test Switch
This toggle switch sets the high speed data set into local
test mode and causes data to be wrapped around through
the data set with a start 1/0 loop test instruction in test
mode.
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