| NMRA DCC Controller for Model Railroad |
RailCom
Foundation of RailCom
RailCom is the method of interactive communication which is developed by Lenz corporation. This future is valid when power station with cutout future and RailCom detector are used. Even if power station without cutout future is used, decoder wonft be damaged.
RailCom packet is transmitted after DCC packet. RailCom packet is constructed from CH1 and CH2. CH1 can send one byte data and CH2 can send two byte data.
Power station ,rail, detector and decoder are connected in series.
RailCom Data and Operation
* VER Response of CV Value
CV number and CV value is transmitted from decoder, just after CV verify DCC packet is received. When operation mode verify is performed on command station, CV value can be read immediately on RailCom detector. For that, it can solve the problem that it takes long time to read CV value using Page Mode.
* BROAD-ADR Broad Cast Address
Primary address is always transmitted for position detection of the train. If RailCom detector is connected to gapped section, when train enters its gapped section, primary address of this train can be detected. But if two vehicles which have different primary address enter same section, address can not be detected. Thus, only leading vehicle can be detected.
* ACK Acknowledge of DCC Packet
Decoder send whether DCC packets successfully are received or not. Therefore command station donft have to send same packet many times.
* SPD Speed Step (Before Speed Table)
Speed Step after CV3 acceleration or CV4 deceleration is sent. If speed step is the same as real speed, the user can know real speed.
* SPD2 Speed (After Speed Table)
Speed step after speed table is sent. The user can know speed direction applied to the motor.
RailCom Motor Noise
When RailCom is used, power station performs cutout which means that DCC packet transmission is suspended while decoder sends RailCom packets. Cutout also means that power supply is suspended. Power supply is suspended can not make the decoder stop. But it makes motor noise. The user can not hear this noise from model vehicle is made plastic into. But the user can hear this noise from the vehicle is made brass into. We can recommend low noise type decoder for preventing this noise. This decoder equips capacity, so power supply is provided into motor even during cutout period.
