JRC NWZ-4740 - Connecting 2 GPS Units to an Automatic GPS Select Switch

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6.4.6 Connecting 2 GPS Units to an Automatic GPS Select Switch
An automatic GPS select switch (NCZ-1537A) can be used to connect and automatically switch
between two GPS units. The No. 1 GPS unit normally outputs data, but when it is not performing
positioning, the No. 2 GPS unit is automatically switched over to.
To perform automatic switching, the two GPS units must be connected in a LAN, and the No. 2
GPS unit must output control signaling to the automatic GPS select switch.
Set the No. 1 GPS unit LAN setting mutual monitoring to "On".
Set the No. 2 GPS unit LAN setting mutual monitoring to "On", and set the control signal output
port data format to "SWITCH".
Set the Dip switch (S1) on NCZ-1537A to 1: ON and 2: ON.
No. 1 GPS Unit
No. 2 GPS Unit
Connection Example
The following connection conditions apply to the connection example.
・GPS Data is output from TXD3 Port (DATA OUT3) of each GPS Unit.
・Control signal is output from TXD2 Port (DATA OUT2) of No2 GPS Unit.
GPS select
Switch
NCZ-1537A
Control Signal
No. 1 GPS
Data
No. 2 GPS
Data
LAN
No. 1 or No. 2 GPS Data
24+
24-
SL+
Sl-
DI+
DI-
G1+
G1-
G2+
G2-
GO+
GO-
Power 12/24V
GND
No2GPS TXD2 Purple ( 7 )
No2GPS TXD2 Grey ( 8 )
No1GPS TXD3 Green ( 5 )
No1GPS TXD3 Blue ( 6 )
No2GPS TXD3 Green ( 5 )
No2GPS TXD3 Blue ( 6 )
GPS Data Output A
GPS Data Output B
NCZ-1537A Terminal
Control Signal
No1GPS Data
No2GPS Data
GPS Data Output