Why are you using the sniffer instead of the B-Bus, especially as the B-Bus is for use with Roco?
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You should not need the auto-reverse if you are certain the polarities are the same, but by the same token if they are the same then having it switched on will do nothing. Personally I would leave it on to avoid the potential for a phase reversal.
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IIRC the voltages at the boundary need to be within ?v of each other and I suggest that you check the loaded voltage on both sides of the boundary. Loaded means something drawing current on each side, a voltage without a load can be very misleading. You will be able to adjust the Z21 voltage easily, the DR5033 needs a change of power supply to change the voltage. Remember that if you change the track voltages you may need to remeasure the iTrain speed profiles.
My layout is divided into two power zones with double track breaks between each zone. I have a z21 Black and two Dr5033 DigiBoost units connected to the Z21 via their sniffer inputs. All appears to work correctly except:
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If I run a lighted coach (Pullman) across the zone boundaries the lights go out whilst one bogie is in each zone. Placing a track tester across the zone boundary on opposite lines lights the tester very dimly.?
Digiboost is set ?to not auto reverse polarity and polarity is the same in both zones. Train behaviour is normal.?
