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The Test-LCW Address switches represent the
address of the line-control word (LCW) under test.
The 1, 2, 4, and 8 switches represent low-order
address bits 7 through 4 of the multiplexing interface
address. The position of the 16 switch determines
one of two group-address combinations (four high-
order bits).
Load Line Ctl Word
This switch selects the 8-bit portion of an LCW or
S-line segment (if feature is used) into which the
contents of the bit switches will be loaded.
Eight
positions (R1 for LCW1 and R2 for LCW2) select one
of eight 8-bit portions of the addressed LCW (Table
2-1); the S REG position selects the S-line segment
of the addressed line.
With the Load Line Ctl Word switch in the TSMT
CHAR position, the character determined by the set-
ting of the bit switches is transmitted once on the
communications-line address determined by the Test-
LCW Address switches when the Load switch and the
Single Cycle switch are depressed. Also, command
bit 7 in LCW 2 is set, defining a Write command for
this operation. A valid terminal-control code must
be in the LCW 2 terminal-control field.
Off-Line Test/Normal
With this switch in the OFF-LINE TEST position, the
2702 cannot communicate with the multiplexer chan-
nel once the processor goes to a wait or halt state
and the 2702 is command-free.
This switch must be in the NORMAL position to
allow the 2702 to communicate with the multiplexer
channel.
Power Control
With the Power Control switch in the REMOTE posi-
tion, 2702 dc power can be turned on or off only from
the operator's panel on the processor.
With the Power Control switch in the LOCAL or
DEGATE position, the 2702 dc power is turned on
and off from the 2702 operator's panel. The DE-
GATE position must be selected to prevent channel
interference when the 2702 power is turned on or off.
CE Test
This switch activates all other CE switches described
in the following paragraphs and is effective regard-
less of the setting of the Off-Line Test switch.
2-6
Test- LCW Adapter Enable/Disable
This switch sets (enables) or resets (disables) the
'enable' latch in the line adapter addressed by the
Test- LCW Address switches.
This switch is active only if the CE Test switch
is depressed.
Test- LCW Reset
The Test- LCW Reset switch resets the S-line seg-
ment of the line referenced by the Test-LCW Address
switches and resets the LCW storage except check
bits L1 and L2 and the TC field (Term Ctl indicator).
This switch is active only if the CE Test switch
is depressed.
Single Cycle
The Single Cycle switch initiates the action specified
by whichever one of the following three switches is
selected: Clock, Test Osc, and Load.
This switch initiates aCE wrap test when the
Wrap switch is depressed.
This switch is active only if the C E Test switch
is depressed.
Clock
The Clock switch is used in conjunction with the
Single Cycle switch or the Multicycle switch to step
the C clock ring.
With the Clock switch depressed, depressing the
Single Cycle switch complements the A/B trigger,
stepping the clock ring count by 1.
With the Clock switch depressed, depressing the
Multicycle switch steps the clock ring count automat-
ically by 1 every 220 ms.
The Single Cycle switch is active only if the CE
Test switch is depressed.
Test Osc
The Test Osc switch is used in conjunction with the
Single Cycle switch to complement the 'test oscillator'
trigger.
With the Test Osc switch depressed, depressing
the Single Cycle switch complements the 'test oscil-
lator' trigger. This simulates a line oscillator
(LOSC) change, resulting in strobe counting, bit
counting, character assembly, etc.
The Test Osc switch is active only if the CE Test
switch is depressed.
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