Digitrax Decoder Index

DH123 Series

The DH123 decoder is available with 4 different Digitrax Easy Connect Wire Harnesses.

DH123D Instructions DH123P Instructions DH123PS Instructions

DH123AT Instructions Digitrax Decoder Manual

Physical Size	0.66” x 1.2 x 0.25” 16.76mm x 30.48mm x 6.35mm		Current Rating		1.5/2.0 Amps
Interface	Decoder End	Wires			End/Plug
DH123D	DTX 9	6.9”		175 mm	Wires
DH123P	DTX 9	3.5”		88 mm	DCC Med
DH123PS	DTX 9	1.2”		30 mm	DCC Med
DH123AT	DTX 9	5.9”		150 mm	Athearn Clips

# Functions	6	Function Current Rating	500mA	Function Type	FX^3
Prod Date	11-13-2002	Discontinued	Current	Replaced By	N/A

FX³ Motor Isolation Protection Note

CV#	Feature	Default	Range	Notes
2 Digit and 4 Digit Addressing
01	2 Digit Decoder Address	003/x03	001-127
17	4 Digit Address Hi Byte	000/x00	0128-9983	CV17 & 18 are used
18	4 Digit Address Lo Byte	000/x00	0128-9983	together
29	Configuration Register	006/x06	Table 29
Configuration Register
29	Configuration Register	006/x06	Table 29
	Address Selection, 2 or 4 digit	2 Digit	2 or 4 Digit
	Normal Direction of Travel (NDOT)	Fwd	Fwd/Rev
	Speed Step Control	28/128	14 or 28/128
	Speed Table On/Off	Off	Speed Table On or Off
	Analog Mode Conversion On/Off	On	On or Off
LocoMotion^TM
Acceleration & Deceleration
03	Acceleration Rate	000/x00	000/x00 to 031/x1F	128 Steps
04	Deceleration Rate	000/x00	000/x00 to 031/x1F	128 Steps
Three Step Speed Table & Start Voltage
02	Start Voltage	000/x00	000/x00 to 255/xFF	128 Steps
05	Maximum Voltage	000/x00	000/x00 to 255/xFF	128 Steps 000/x00, 001/x01 & 255/xFF= max voltage at step 28
06	Mid Point Voltage	000/x00	000/x00 to 255/xFF	128 Steps 000/x00 & 001/x01= straight line curve
28 Step Speed Tables-256 step resolution
65	Kick Start value	000/x00		128 Step Interpolated
66	Forward Trim	000/x00		128 Step Interpolated
67	First Speed Table Entry	000/x00		128 Step Interpolated
68-93	28 Step Speed Table Entries	000/x00		128 Step Interpolated
94	Maximum Speed Table Step	000/x00		128 Step Interpolated
95	Reverse Trim	000/x00		128 Step Interpolated
29	Configuration Register	006/x06	Table 29	Set to enable speed tables
Torque Compensation & Switching Speed
53	Not Used in FX^3 Decoders			Not Available
54	Torque Compensation Switching Speed	000/x00	Table 54
DC Functions
13	DC Functions ON Not Used in FX^3		Automatic	Not Used FX^3
FX^3 Functions
49	F0F, forward light effect white	000/x00	FX^3 Effects Table
50	F0R, reverse light effect yellow	000/x00	FX^3 Effects Table
51	F1, Function 1 green	000/x00		Not Available
52	F2, Function 2 violet	000/x00		Not Available
113	F3, Function 3 brown	000/x00		Not Available
114	F4, function 4 white/yellow	000/x00		Not Available
115	F5, Function F5 white/green	000/x00		Not Available
116	F6, Function F6 white/blue	000/x00		Not Available
62	FX Rate and Keep alive adjust	000/x00	000/x00 to 255/xFF
63	Ditch Light Blink hold time	000/x00	000/x00 to 255/xFF
Directional Headlights, Transponding, Split Field Motor
61	Directional Headlight	Directional	Remap F0 Forward & Reverse
	Transponding	Off	Off or On See Table 61	Transponder ID ONLY
	Split Field Motor	Off	Off or On See Table 61
Scaleable Speed Stabilization