SoundTraxx DSD-150/DSX Technical Reference - Manual (Page 2)

001 Advanced Operation Instructions
The DSD will process only the 128 Speed Step Control form (00111111b) of this instruction.
All other sub-instructions will be ignored.
010 Reverse Speed and Direction Instruction
The DSD will process all forms of this instruction.
011 Forward Speed and Direction Instruction
The DSD will process all forms of this instruction.
100 Function Group One
The DSD will process all forms of this instruction.
101 Function Group two
The DSD will process all forms of this instruction.
110 Reserved Instruction
The DSD will process all forms of this instruction.
111 Configuration Variable Access
The DSD will parse both the short form and long form of this instruction.
Only short form instructions formatted as 11110010b (CV 23 access) or 11110011b (CV 24 access) will be pro-
cessed. All other short form instruction will be ignored.
All long form instructions will be processed. However, attempts to write to the following CVs in operations mode will
be ignored:
CV 1 Primary Address
CV 7 Mfg. Version ID
CV 8 Mfg. ID
CV 17 Extended Address MSB
CV 18 Extended Address LSB
Write operations to other CVs may be ignored if an attempt is made to write illegal values. See individual CV
descriptions for details on illegal values.
The DSD will send a basic acknowledgment upon successfully processing an operations mode CV access instruc-
tion provided the locomotive is stopped. Otherwise, no acknowledgment is sent.
Programming Modes
The DSD will supports all six programming modes defined in RP-9.2.1 and RP-9.2.3:
Address Mode
Register Mode
Service Mode
Direct Mode
Ops Mode Long Form
Ops Mode Short Form
Not all CVs can be programmed using all modes. Table A lists all CVs supported by the DSD, their applicable
programming mode address as well as the factory default values.
When entering service mode, the DSD will turn off all auxiliary functions and sounds to reduce its current draw to as
low a level as possible.
If the DSD receives an instruction packet to read or write a CV not listed in Table A, the instruction packet will be
ignored and no acknowledgment will be generated.
2 Digital Sound Decoder Technical Reference