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11 NBDP TRANSMITTING, RECEIVING
11-3
11.2 ARQ Mode Operation
In ARQ operation, one station (information sending station) sends data to another block by
block, then listens for the acknowledge signal between blocks from the information
receiving station which requests either the next block or retransmission of the last block if
there is error. The request may be repeated up to 32 times, until the complete block is
received free of error.
Establishing connection
1. Press the function key [F3] to display the Operate menu.
1: Call Station
3: File to Send
4: Cancel Sending
5: Scan (Start/Stop)
6: Manual Reception
7: Timer Operation
8: Manual Calling
9: Set Frequency
Operate
2: Macro Operation
2. Press the [1] key to choose Call Station.
Caps-Eng
Station Name : CHOUSHI-8M
Frequency (T/R) : 8765.00 / 8965.00(kHz) Comm Mode :AQW
Comm Status : Connect Send Lock Error Mark Space
Sending Volume : 100(%) ARQ Error : 0 ARQ Time : 0(sec)
2002-01-15 14:41:09 UTC
Call Station
Station List
ABC-4M
ABC-6M
ABC-12M
ABC-8M
FURUNO
Station Setup
Station : ABC-4M
ID Code : 45678
Mode : ARQ FEC
CH/Table : Channel Scantable
Num/Table:
1:File 2:Edit 3:Operate 4:Window 5:Station 6:System 7:WRU 8:HR 9:Over 10:Break
Call Station menu
3. Choose a station. (Station must be registered for use in the ARQ mode). Press the
[Enter] key. The message "Calling Station" appears. If the message "Station calling
suspended. Check radio and interconnections. Press any key to escape." appears,
check both the power of the radiotelephone and the connections between the
radiotelephone and the NBDP Terminal Unit.
4. When an acknowledge signal is detected, "Connect" appears in reverse video on the
communication status display (see below).
Note: If signal conditions are poor, connection may take a while. If the line could not
be connected in one minute, calling stops and "Calling failed" appears. Try step
3 again, one minute later. Should signal conditions worsen during message
transmission, "Error" appears in reverse video and 30 seconds later the line is
disconnected.