Chapter 10: NMEA Module, Rev. 1.3
If the VDR installation includes multiple NMEA modules, they can be connected using the
cascading (daisy chaining) method. This involves connecting the RS422 output port on the front
of the NMEA Module that is not connected via Ethernet, to the RS422 input port on the front of
the NMEA Module that is connected via Ethernet. This allows the data to be collected on one
module and then sent to the second one which will then transmit that data to the DMM via
Ethernet.
Note! When daisy chaining NMEA modules, the MUX ID of the NMEA modules
must be changed so that they reflect what position they are in the “chain”. NMEA
module 1 would use “MUX ID 1”, NMEA module 2 would use “MUX ID 2”, etc.
Refer to 10.5.3 NMEA Module ID (MUX ID) – DIP Switch Settings for the DIP
switch settings for changing the Mux ID on the NMEA module.
Figure 10–3 - Connecting multiple NMEA modules using the (daisy chaining method).
VDR-100G3/G3S Installation Manual 15/01/2009
10-5
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