HO 2-Function Dual-Mode® Decoder Manual
Contents
1. calculated by the decoder 0 255 Factory Default Speed Curve User Identification 1 0 255 User Identification 2 Decoder Software Version read only 0 255 CREATING A SPEED CURVE One common feature is to set a specific operating speed curve for your locomotives This is usually done to have dissimilar locomotives have the same performance characteristics or to have the locomotives perform more prototypically Start by writing down how you want to assign the internal speed settings to the speed steps for example by making up a table as shown below Note CV2 Start Voltage is still used as part of the calculation even when the decoder is in User Defined Speed Curve mode Speed step in 14 27 mode Speed step in 28 mode Default speed setting CV register 1 4 67 2 8 68 2 3 12 69 4 16 70 3 5 20 71 6 24 72 4 7 28 73 8 33 14 5 9 38 75 10 43 76 6 i 48 71 12 53 78 7 13 60 79 14 67 80 8 15 14 81 16 82 82 9 17 90 83 18 98 84 10 19 106 85 20 115 86 i 21 125 87 22 137 88 12 23 152 89 24 178 90 13 25 194 91 26 212 92 14 27 232 93 28 255 94 In 128 speed step mode the decoder internally averages the speed table to obtain the cor rect speed step value C MODEL RAILROAD CO INC FOR TECHNICAL ASSISTANCE www atlasrr com dec atlasrr com Atlas Model Railroad Co Inc 603 Sweetlan2. USER MANUAL ATLAS HO DUAL MODE DECODER ITEM 340 Atlas new Dual Mode Decoder DMD presents a whole new concept in the evolution of DCC For the first time modelers are able to run a decoder equipped locomotive on a standard DC powered analog layout without experiencing the typical speed dif ferential Although this new decoder was designed for use with our own Atlas Master DCC System it is also compatible with other DCC systems that are NMRA compliant It can also be installed into any locomotive with a motor mounted light board which includes almost all Atlas engines produced since 1985 plus many from other manu facturers What s more the reasonably priced Atlas Dual Mode Decoder is packed with all the features you expect from any high end decoder ATLASMASTER DCC SYSTEM dual mode Decoder e Selectable for operation with 14 28 128 direct drive or 128 speed table mode with precision glide motor control e Two on off function outputs with a current rating of 200 mA that can be carmare for either directional lighting full Rule 17 lighting or lights and Function 1 Headlights can also be dimmed using an extra function e Support for Advanced Consist Control and Extended Addressing e Operation on conventional DC analog layouts without the typical speed differential e Full Sor for operations mode programming long and short and full support for all forms of programming as described in NMRA RP 9 2 3 Rich set o
3. d Ave e Hillside NJ 07205 7
4. e is the manufacturer ID of the decoder Atlas 127 Writing a value of 33 to this Register resets all CVs to their factory condition 99 17 Extended Address High Byte 192 231 18 Extended Address Low Byte The two byte address if used is contained in V17 18 Consist Address The advanced consist address if used is stored in CV19 0 255 0 255 23 24 Acceleration Trim This Configuration Variable contains additional acceleration rate information that is to be added to or subtracted from the base value contained in V3 Deceleration Trim This Configuration Variable contains additional brakin rate information that is to be added to or subtracted trom the base value contained in V4 0 255 0 255 255 255 29 Decoder Configuration Byte 1 Several decoder properties are set with this byte Changes are easiest if done in binary mode but can ako be done by adding the decimal value in parenthesis for all the features desired together and writing the total into V29 The detailed properties are 0 55 CV REG Description Bit 0 Locomotive direction Locomotive s normal direction This Bit sets the direction the locomotive will move when told to move forward in digital mode 0 locomotive s direction is normal 1 locomotive s direction is inverted Range Factory Setting Bit 1 Headlight mode 0 Operation with 14 o
5. f properties that the user can set to customize the decoder to a particular locomotive e Provides 1A continuous motor current e Size L 1 52 x W 0 67 x H 0 13 L 40 5mm x W 17mm x H 3 3mm The NMRA awards its prestigious Conformant and Inspection label to products it has tested and found to be in full compliance with all NMRA DCC Standards Recommended Practices and industry norms This is important in order to ensure compatibility in the DCC industry The more manufacturers that go through the process and receive Conformance Warrants the more consumers will benefit from interoperability of products Atlas Dual Mode Decoder was tested by the NMRA s C amp I committee and has been awarded NMRA Conformance Warrant 2000 07 Many characteristics of the DMD can be programmed to customize the decoder based on the locomotive it is installed in Please read The Configuration Variables and Their Meanings section later in this booklet for details on the configuration variables supported by the DMD The DMD supports all forms of programming described in NMRA Recommended Practice 9 2 3 including the user friendly direct CV programming mode and the operations mode pro gramming so you can adjust values while the locomotive is in use For example you can operate the decoder with the factory pre set speed table or generate your own You can set which end of the locomotive is the forward end You can even decide whether or not you want to be able t
6. o operate on conventional DC layouts when in DCC mode ANALOG DCC JUMPER The DMD you purchased as a separate item is set to DCC mode at the factory The position of the jumper pin determines which mode the decoder is in see diagram below To operate the decoder in Analog mode move the jumper plug to the pair of pins closest to the edge of the decoder marked Rear as shown below ra x e E ab a JE Des a za Fo p o a j a Digital Mode Replace as shown for Analog Mode PREPARING TO INSTALL THE DECODER Before installing your decoder the locomotive must be tested for operation on normal DC power Replace worn out motor brushes and burnt out light bulbs Clean any dirt or oxidation from the wheels and pickups and make sure that electrical contact is smooth Now is also a good time to lubricate your locomotive A locomotive that runs well under DC will run excep tionally well under DCC See the paperwork in the decoder box for installation instructions Decoder output current draw An internal rectifier supplies the current for all the decoder outputs with a maximum current rating of 1 2 Amps The sum of all currents to the motor and the function outputs cannot exceed this limit Each individual output can only draw up to its limit Summing up the individual current limits leads to a number larger than 1 2 Amps but they still are not permitted to draw more than this limit Example Suppose the m
7. otor may require as much as 1 0 Amp continuously Then the function outputs combined must not exceed 0 2 A If the directional headlights require 50 mA each then the load on Function 1 must not exceed 150 mA IMPORTANT WARNINGS Although the DMD has many internal safeguards to prevent damage please follow these guidelines 1 DO NOT allow any metal part of the locomotive to touch the surface components of the decoder This could cause a direct internal short circuit and the decoder will be destroyed 2 DO NOT WRAP the decoder with electrical tape or shrink wrap Doing so will impede air circulation and degrade the performance of the decoder Instead put electrical tape over any part of the locomotive frame or body that might touch the decoder This will prevent short circuits without suffocating the decoder The existing shrink wrap over a part of the locomotive decoder protects static sensitive parts and must not be removed 3 The DMD cannot be set up for simultaneous use with 2 rail pickup and overhead catenary or trolley operation If the locomotive is turned the wrong way the decoder could get twice the track voltage which would destroy it 4 After removing all connections from the original light board there must be no electrical connection between the motor and the rail pickups PROGRAMMING THE DECODER Once installed many features such as the locomotives address acceleration and configura tion can be customized The pro
8. perties will be saved in non volatile memory locations on the locomotive decoder so they retain their value even after the power has been removed for years These memory locations are called Configuration Variables or CVs by the NMRA The values are set electronically which means that the locomotive does not need to be opened after initial installation of the decoder to read or later modify any CV value The DMD has a total of 128 programmable CVs Not all of them are used at this time as many are reserved for future use Any NMRA DCC Command Station such as the Atlas Master DCC Commander can be used to program all DMD CVs With several entry level systems such as the ROCO DIGITAL is cool command station only CV 1 locomotive address can be set unless you use a separate pro grammer More advanced DCC systems support the ability to set many more CVs The DMD supports all modes of programming and can be programmed by all NMRA DCC programmers Specific details for reading and writing the decoder s configuration variables can be found in the manuals of the specific Command Station or programmer you are using The Configuration Variables and their meaning All the CVs are numbered These numbers are used to identify the feature you are trying to program and are identical for all decoders that conform to the NMRA standards independent of the manufacturer The following table lists the various CVs supported by the DMD Both the CV number
9. r 27 speed step systems This setting is selected when the locomotive decoder is used with any Digital system that does not support 28 speed step mode If the headlights turn on and off as the speed is increased the command station is configured for 28 speed step mode and the decoder is in 14 speed step mode 1 Operation with 28 55 or 128 speed steps If you use this setting the Command Station must also be configured to use 28 speed ste mode or 128 speed step mode for the decoder s address otherwise the headlights can not be controlled 0 1 Bit 2 Usage on conventional DC layouts 0 locomotive operates in digital mode only 4 1 locomotive can operate on either conventional DC and on DCC Bit 3 Always 0 0 0 Bit 4 Speed Curve Selection 0 1 0 0 factory pre set speed curve is used 16 1 user defined speed curve is used Please enter the appropriate values into CV 67 to 94 before setting this Bit Bit 5 Extended Addressing 0 1 0 0 Normal poke 32 1 Two Byte extended addressing Bit 6 always 0 0 0 Bit 7 50 Decoder Configuration byte 2 0 Similar to CV 29 but used to set other properties Bit 0 not used Bit 1 0 CV23 and CV24 are not active 0 1 0 1 V23 CV24 are active and contain the acceleration 2 and deceleration trim values that are added to CV3 or CV4 Bit 2 Brake momentum on DC operation 0 1 A Used to achieve prototypical braking at red signal indica
10. s and the Register numbers are provided for cross reference Please note Some CVs such as CV29 have specific meanings for each Bit The Bit assign ments in this table use a Bit numbering scheme of 0 7 to correspond the NMRA convention for universal Bit numbering Table 1 DMD Confi CV REG Description uration Variables e Factory Setting 1 1 Locomotive address 1 127 3 This is the address used to select a locomotive you wish to run Setting the address from 1 to 3 using register mode will reset the decoder to utilize 14 speed step operation CV REG Description Range Factory Setting 2 2 Start voltage This is the voltage applied to the motor in speed step 1 Set this value so that the locomotive just starts moving in speed step 1 0 31 8 Acceleration Momentum Determines the rate of change of speed upon acceleration A higher value leads to a slower acceleration Brake Momentum Determines the rate of change of speed upon braking A higher value leads to longer brake distance Contains CV29 see CV29 below 0 55 Page Register Normally this CV is not modified directly by a user For correct operation this CV should be set to have a value of 1 after any use 0 127 Version Number This location stores the version number of the decoder This location is read only 45 Manufacturers Identification Factory reset This valu
11. tions if conventional DC control CV29 2 is disabled CV 29 Bit 2 0 0 locomotive proceeds with track voltage dependent speed inside the conventional DC section 1 locomotive brakes in the conventional DC section with pre set brake momentum 5 CV REG Bits 3 7 Description not used Range Factory Setting Lighting Special Effects for Outputs A and B Bit 0 0 the headlights are directional 1 the lights are independent per Rule 17 FO controls the Hh headlight and F1 the rear headlight or a separate unction 0 1 0 function dimming disabled 1 the value in CV52 is used for headlight function dimming If V51 0 0 then F1 dims the headlight if on 0 1 1 if CV51 0 and CV51 2 both 1 dimming and Rulel7 are both active F4 dims FO 0 1 1 if CV51 0 and CV51 2 both 1 dimming and Rule 17 are both active F4 dims F1 0 1 Not used Dimming CV contains the value used for dimming 0 is dark 255 is max brightness 0 255 Values for user defined speed curve These registers are used for a user defined speed curve The factory setting for these registers is shown in the ollowing speed curve table The value in each CV determines the velocity of the locomotive for each assigned speed step For the 14 speed step mode the odd CVs are used If you are using 128 speed step mode and you have activated the user detined speed table the intermediate speed steps are
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