Service manual

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SMARTFIND NAVTEX service manual Page 26
Testing serial data ports COM1 (15 D), COM2 (9 D)
Use this procedure to verify the correct operation of each communications data port
hardware.
Make a loop back test.
(15 D) COM 1, (normally assigned to GPS or ECDIS)
The connections to the D-Sub 15-pin socket on are given below.
(link TXA to RXA & TXB to RXB)
To quick way to do this is to temporary connect together the following cable cores
contained within the power cable provided as standard.
Power, Alarm & IBS port (2m cable supplied)
Pin
Number
Connection NAV-7 Cable Colour Notes
1 IBS_TXA O/P WHITE/BLUE O/P to IBS port
2
3 +V
(12/24 V DC nominal)
I/P RED/BLUE Ship’s supply +ve
4 -V (0V) I/P BLUE/RED Ship’s supply -ve
5
6 IBS_TXB O/P BLUE/WHITE O/P to IBS port
7
8 AUX_NC O/P ORANGE/WHITE Alarm Relay NC
9 AUX_NO O/P WHITE/BROWN Alarm Relay NO
10 AUX_COM O/P WHITE/GREY Alarm Relay COM
11
12 IBS_RXB I/P GREEN/WHITE I/P from IBS port
13 IBS_RXA I/P WHITE/GREEN I/P from IBS port
14
15
Make a loop back test plug (9D) COM 2
(normally assigned to printer or PC)
The connections to the D-Sub 9-pin socket on are given below.
(link TXA to RXA & TXB to RXB)
A spare 9 D plug connector should be wired as follows;
NMEA 0183 & printer port
Pin Number Connection Notes
1
2 SER_TXB O/P to NMEA 0183 (printer)
3
4 SER_RXB I/P from NMEA 0183
5
6
7 SER_TXA O/P to NMEA 0183 (printer)
8 SER_RXA I/P from NMEA 0183
9
With the loop back connector in place check for serial data being echoed back in the
serial monitor window. A regular ALM sentenced should be seen and also any
message text sent for printing. When data is correctly echoed in the monitor window
it proves that the serial port hardware is sound.