another PING until the first one's PONG has come back.
-POLARITY and POLARISED
-----------------------
+POLARITY
+--------
The POLARITY command may be sent whether the track power is enabled or
disabled. The polarity of each segment is `unreversed' after ON; it
physical segments to segment numbers is complex due to bit-twiddling.
see detpic/reverse.asm and layout/data2safety.)
-The PIC will reply to POLARITY with POLARISED when the polarity change
-is complete. The host must not send another POLARITY until then.
-
NMRADATA and NMRAFULL
---------------------
-either only POLARITY when we've had POLARISED or delete
- that bit from the docs
-
optional but maybe before can test:
wiring to gui display
make it possible to reverse a train ?
would be nice to do something with POINTED
- does it even exist