12
Installation
C4900/01
5. ATTENTION:
When more control units are connected to the VHF system, they all have to be assigned different location
numbers for the system to function correctly.
The control unit placed at a ship’s main place of control should be assigned location number 1.
In the VHF system the control unit which has location number 1 also has the highest priority in the system and
is thus able to control the system at any time.
2.8 System Function Test
When a handset has been connected to the VHF system, go through the following test procedures to ensure correct
system function. If the test items are performed succesfully the VHF system functions correctly.
Purpose: To test correct assembly of the system, ensuring SPARC-bus command communication between
all system units, including system control priorities for the control units. Check the telephony TX
LF and RX LF routing.
Test setup: Turn on all control units, all handsets placed on hook, each unit showing VHF display.
2.8.1 Test Procedure System Priorities:
(System Control and SPARC-Bus Data Interface Circuits)
If only one control unit is connected, just hook off the handset and change the channel or push PTT once to ensure
that the handset is able to control the system.
If more control units are connected, do the following:
Test stimuli Expected result
1a Handset (loc_1): Hook off. Handset loc_1: VHF display.
Other control units: OCC display.
16
0 08 01
MEM VOL SQ
oCC
1 “NAME”
0010
To Next Page
Loading...
