Installation; Setting Jumpers - JRC RADAR 1800 Instruction Manual

Installation

Setting Jumpers

Table 1 is a summary of the operation of the display unit when the jumpers
in the switchbox have been set. The mode for setting 1 or 2 can be selected
depending on the jumper settings in the Interswitch box. The factory default
setting is 2 (settings 3 and 4 are prohibited).
In setting 1, operation is standard as noted above. The last unit to be turned
ON can use the antenna, the display unit that is already powered up can not use
the antenna and has its power turned OFF at the same time.
Setting 2, (factory default setting: initialization setting) is applicable when
display unit 1 is installed in the cabin or someplace similar, and when display unit
2 is installed on the upper bridge or someplace similar.
In this setting, the power to display unit 1 is not turned OFF even if display
unit 2 is turned ON, however, display unit 2 can use the antenna.
However, while the display unit 2 is turned ON, and power is turned ON to
display unit 1, then display unit 2 is turned OFF and display unit 1 can use the
antenna. (Display unit 1 controls the power to display unit 2.)
Therefore, even if display unit 2 on the upper bridge is ON, by turning ON
the power to display unit 1 in the cabin, the power to display unit 2 is remotely
turned OFF. Which then makes it possible to turn OFF power to both units from
the cabin by turning of the power to display unit 1.
Table 6-1 Switchbox TB 1, 2 setting table
Jumper Condition TB1
Setting 1 1-2
(Recommended when
power is not supplied to
the GPS receiver.)
Setting 2 1-2
(Recommended when
power is supplied to the
GPS receiver.)
Setting 3 2-3
Setting 4 2-3
Setting 2 is the factory default setting.
TB2
1-2 Both display unit 1 and display unit 2 can not be turned ON at the
same time.
When display unit 1 is turned ON, and then display unit 2 is turned
ON, display unit 1 is turned OFF. The reverse is the same.
Access to the antenna goes to the display unit that is powered up.
1-2 The power to display unit 1 remains ON even if display unit 2 is
turned ON. However, priority access to the antenna goes to display
unit 2 if display unit 2 is turned ON.
When display unit 2 is turned ON, and then display unit 1 is turned
ON, display unit 2 is automatically turned OFF, and display unit 1
takes priority access to the antenna.
1-2 Prohibited setting
2-3 Prohibited setting
Operation
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