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General operating notices - Face-side connections
An external RF module, for example a WEATRONIC 
module, can be connected to this jack, see illustration 
below.
An external RF module, for example a WEATRONIC 
module, can be connected to this jack. 
If an external RF module is attached, then switching 
between the external module and the internal HoTT 
RF module is accomplished in the "Module" line 
of the »Basic settings, model« menu, page 77 
or 85, by selecting either "HoTT" or "EXT.PPM". If 
necessary, the signal provided on this connection 
can be inverted by selecting the appropriate option 
for the line "ext. PPM signal" in this same menu, see 
page 83 or 92.
Note:
The "INT PPM" socket located inside the transmitter 
is also suitable for this purpose. However, a 
connecting cable must be passed through to the 
outside of the transmitter housing by way of one of 
the module openings originally intended for a switch.
  EXT.PPM
The designation "SPI" stands for an interface for 
future applications. This socket is currently non-
functional and may not be connected.
  SPI