Kongsberg Simrad RA83, Service Manual

Page: 17 / 210

2.1.8 Data Communication
The scanner unit is controlled by the Processor unit through the communication line, DAT, DAT-R.
The communication data format is shown in Table-2.2.
Table-2.2 Data Format
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Type
asynchronous serial data (half duplex)
Structure Start bit 1 bit
Data bit 8 bits
Stop bit 2 bits
Parity bit none
Speed 9600bps
Format binary note: not in ASCII code.
Level 0 to 5 V
The following control signals and data are included in the serial communication line.
Control:
(1) Trigger on/off and trigger frequency
(2) Transmit pulse width
(3) IF band width
(4) Antenna motor on/off
(5) Manual tuning voltage control
(6) Auto tuning start/stop
(7) Auto tuning center frequency
(8) Heater voltage control (For 25kW)
(9) Tail-biter
on/off
(10) PM on/off (op)
(11) PM tuning voltage control (op)
Data:
(1) Tuning meter level
(2) Tuning voltage monitor
(3) High voltage monitor
(4) Magnetron current monitor
(5) Magnetron heater voltage monitor
(6) Scanner discrimination cord
(7) PM RX signal (op)
(8) PM TX signal (op)
2.1.9 Checkpoint and Signal
On the scanner PCB, there are checkpoints for maintenance and adjustment. Checkpoints are
shown in Table-2.3A, Table 2.3B and Table 2.3C.
Table-2.3A Check point and Signal (Modulator PCB for 6/12kW)
Checkpoint signal range (unit)
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TP1
Ground
TP2 Transmit pulse 0-5V pulse
TP3, TP4, TP5 Trigger pulse
TP7 magnetron current
TP9 Motor drive pulse
J4-5, J4-4 Motor drive voltage 12 or 24V
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