7404A-1 - Control Monitor Test Set (Oscar)
Allows monitoring or injection of CCCS bus signals

CCCS = Communication Computation Control System

• Clock = Continuous sine-wave at 4800Hz
• Control = Computer talking to equipment
• Logic Level High = in-phase with Clock
• Logic Level Low = out-of-phase with Clock
• Monitor = Equipment talking back to computer

Back of Unit:

• S1 UP, in Sine Wave at all times
• S2, In LCU for use as local control, in DCU/DCFR for simulating equipment
• P2, P3, P4 Not used
• P5, DCU/DCFE
• P6, LCU Sine Wave / use in conjunction with S2
• F1, Fuse

Front of Unit:

• Clear button - NEVER USED
• Send button - Sends control word ONCE
• 32 toggle switches
• Dialogic bit must be 1 all the time
• S3, Parity Encode, leave in Auto (UP)
• S4, Parity Mode, sensed (UP)
• S5, Retransmit (3-position), Use in Continuous (UP)
• S6, Address length, 7-bit for Local Control, 5-bit for DCU/DCFE
• S7, Half Duplex (HDX) / Full Duplex (FDX), Leave in Full Duplex (FDX)

CONTROL Words come into Oscar and are displayed on the white lights

Receiver:

Exciter:

PA:

Coupler:

SB-3390 Maintenance Display:

Logic Level 1 on the CCCS bus indicates a Status Change
BASICS:

Examples (first bit is count of zero, last bit is 31):

Exciter Keyed in self-test (a1?)

1|01|010|01|0|0000|0100|1000|0000|0000|101

SB-3390 asking OK-145 for Exciter Status

1|01|111|01|1|0000|0000|0010|0000|0000|000