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1. OPERATIONAL OVERVIEW
1-5
1.8 Setting for Auto Acknowledgement
Individual, position, polling and test calls can be acknowledged automatically or manually.
Press the 5/ACK/SQ key to switch the acknowledge mode between automatic and manual
alternately. The message AUTO ACK or MANUAL ACK appears on the DSC standby screen
with each press of the key.
Note: When own ship’s communication is high priority, set to MANUAL ACK.
The auto acknowledgement is not sent in the following cases:
• The category of a received message is DISTRESS, URGENCY or SAFETY.
• The communication mode is NBDP-FEC, NBDP-ARQ or DATA.
• Com Freq is NO INFO.
• ECC is NG (No Good).
• The handset is off hook.
1.9 System Characteristics
1.9.1 Equipment priority
Equipment priority order is as below.
1. Control unit sending distress alert
2. Control unit 1 – routine use
3. Control unit 2 – routine use
4. NBDP
1.9.2 Controls become inoperative
Controls become inoperative in the following conditions:
• When the other control unit goes OFF HOOK on RT mode in the two control units system.
• When the other control unit switches to the DSC mode in the two controls system.
• NBDP is scanning or communicating.
• Distress alert or distress relay is transmitted.
• Call other than distress is transmitted (transmission time about 8 sec.) If it becomes
necessary to unlock the keyboard before the message is transmitted, press the CANCEL
key to cancel the call.
1.9.3 Controls become operative
Controls become operative in the following conditions:
• DISTRESS button is pressed.
• Control unit having higher priority is operated.