QX-4F Decoder Man. pdf 10/02
Contents
1. In 128 speed step mode the decoder internally averages the speed table to obtain the cor rect speed step value 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 are still not permitted to draw more than this limit Example Suppose the motor may require as much as 1 0 Amp continuously Then the function out puts combined must not exceed 0 2 A If the directional headlights require 50 mA each then the load on Function 1 2 amp 3 must not exceed 150 mA IMPORTANT WARNINGS Although the DMD has many internal safeguards to prevent dam age 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 3 The DMD cannot be set up for simultaneous use2. bit is effective 52 Dimming CV contains the value used for dimming 0 255 64 0 is dark 255 is max brightness 53 Lighting Effects for outputs C amp D Bit 0 1 Output C blinks if on 0 1 0 1 Bit 1 1 Output D blinks if on 0 1 0 2 Bit 2 1 Outputs C amp D work as Ditch Lights 0 1 0 4 Bit Not Used 0 1 0 3 7 54 Function Mapping for Output C 0 255 1 If set for Ditch Lights this function turns output on off Bit 0 1 Output C controlled by F1 0 1 1 1 Bit 1 1 Output C controlled by F2 0 1 0 2 Bit 2 1 Output C controlled by F3 0 1 0 4 Bit 3 1 Output C controlled by F4 0 1 0 8 PROGRAMMING THE DECODER The 4 Function DMD supports all forms of programming described in the NMRA Recommended Practice 9 2 3 including the user friendly Direct Mode and Operations Mode which allows you to adjust certain values while the locomotive in use You can choose to oper ate the locomotive with the factory default speed table or define your own You may select which end of your locomotive is the forward end You can even disable operations on DC power when the decoder is in DCC mode Once installed many characteristics such as the locomotive s address acceleration or braking momentum and speed table may be customized to the locomotive These settings are stored in non volatile memory locations called Configuration Variables or CV s and will retain their settings even after power has been removed for years These
3. 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 This Dual Mode Decoder is designed to be installed into any locomotive with a motor mount ed light board It may also be installed into locomotives without a motor mounted light board The following steps are for Atlas locomotives Installation into other locomotives may vary 1 Remove the shell from your locomotive refer to locomotive instructions 2 Remove the weights to allow access to the wire retainers See your locomotive parts diagram for location of weights 3 NOTE THE POSITION OF THE RED amp BLACK MOTOR WIRE LEADS left vs right You will need fo connect them to the decoder in the in the same positions as on the light board 3 4 Remove the 10 wire retainers from the terminals on the light board Then remove the wires from the light board 5 Remove the light board by pushing one of the black motor mount extensions toward the center of the light board and lift the light board off the motor mount Remove the light board from the other motor mount 6 Locate the front of the Dual Mode Decoder and position the DMD over the locomotive Place one of the holes in the DMD over one motor mount and pull towards t
4. 0 16 0 32 0 64 0 128 15 0 64 Factory Default Speed Curve 255 255 01 CV REG Description Range Factory Setting Bit 2 Brake momentum on DC operation 0 1 0 Used to achieve prototypical braking at red signal indications 4 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 Bit Motor Drive Selection 0 1 1 3 4 0 Precision Glide Control 8 Silent Drive Bits 4 7 Not used 0 51 Light effects for output A front output 0 129 0 Bit 0 O the headlights are directional per Rule 17 0 1 0 1 FO controls front headlight A F1 controls rear 1 headlight B Bit 1 O Dimming feature disabled 0 1 0 1 the value in CV52 is used for headlight function 2 dimming If V51 0 0 then FI dims the headlight if on Bit 2 O headlight cannot be dimmed 0 1 0 1 headlight can be dimmed 4 Bit 3 Not used 0 1 0 Bit 4 1 Headlight functions as Gyro Light 0 1 0 16 Bit 5 1 Headlight functions as Mars Light 0 1 0 32 Bit 6 1 Headlight functions as Single pulse Strobe Light 0 1 0 64 Bit 7 1 Headlight functions as Double pulse Strobe Light 0 1 0 128 Note Bits 4 8 only effective if bit 1 is set If more than one bit is set the higher
5. LIMITED ONE YEAR WARRANTY Atlas Model Railroad Company Inc warrants that this decoder will be free from defects in material and workmanship for a period of one year from the date of pur chase If this decoder fails during the warranty period uninstall and carefully pack the item in the original carton together with the dated sales receipt and return to Atlas 378 Florence Avenue Hillside NJ 07205 Defects due to misuse improper maintenance and or abuse are not covered by the warranty This warranty gives you specific legal rights and you may also have other rights which vary from state to state HLF C MODEL RAILROAD CO INC FOR TECHNICAL ASSISTANCE www atlasrr com or dcec atlasrr com Atlas Model Railroad Co Inc 378 Florence Ave Hillside e NJ e 07205 12 USER MANUAL ATLAS HO DUAL MODE 4 FUNCTION DECODER ITEM 342 Atlas HO 4 Function Dual Mode Decoder DMD presents a whole new concept in the evolution of DCC Modelers are able to run a decoder equipped locomotive on a stan dard DC powered analog layout without experiencing the typical speed differential Although this 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 manufacturers What s more the reasonabl
6. convention for universal Bit numbering CV REG Description Table 1 DMD Confi uration Variables Table 1 DMD Confi 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 uration Variables Range Factory Setting 0 1 0 1 Bit 1 Headlight mode 0 Operation with 14 or 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 step mode or 128 speed step mode for the decoder s address otherwise the headlights can not be controlled 0 1 1 2 Bit 2 Usage on conventional DC layouts 0 locomotive operates in digital mode only 1 locomotive can operate on either conventional DC and on DCC 0 1 4 Bit 3 Always 0 Bit 4 Speed Curve Selection 0 factory pre set speed curve is used 1 user defined speed curve is used Please e
7. e must be tested for operation on normal DC power Replace worn out motor brushes and burnt out light bulbs Clean any dirt or oxida tion from the wheels and pickups and make sure that electrical contact is good Now is also a good time to lubricate your locomotive A locomotive that runs well in standard DC will run exceptionally well in DCC mode CREATING A SPEED CURVE Speed Curves allow you to define how your locomotive will operate at different speed steps Speed Curves are often used to allow two very different locomotives to operate together To define a speed curve make a table as shown below and enter the appropriate values for each speed step Next change the decoder configuration CV to activate your speed curve CV 29 22 After testing your locomotive make any changes necessary and re test your loco motive until you get the operation you desire The Start Voltage defined in CV2 is still used after you enter a speed table and may effect the operation of your locomotive Speed step in 14 27 mode Speed step in 28 mode Default speed setting CV register l 1 4 67 2 8 68 2 3 12 69 4 16 70 3 5 20 I1 6 24 12 4 7 28 73 8 33 74 5 9 38 75 10 43 76 6 1l 48 11 12 53 18 7 13 60 79 14 67 80 8 15 74 81 16 82 82 9 17 90 83 18 98 84 10 19 106 85 20 115 86 ll 21 125 87 22 137 88 12 23 152 89 24 178 90 13 25 194 9 26 212 92 14 27 232 93 28 255 94
8. he other motor mount and lower the DMD in place 7 Insert the two wires of the front and rear lights through the holes in the center pair of terminals on the front and rear of the DMD Install wire retainers over the terminal to hold the wire in place 8 Connect the four wires from the trucks to the four terminals on the corners of the DMD and install wire retainers over each terminal 9 Connect the motor wires to the terminals on the side of the DMD in the same positions as they were on the light board and install wire retainers over each terminal NOTE The wire retainers should be installed with the notched side up REAR RIGHT PICKUP FRONT RIGHT PICKUP i C7 LIGHT H LIGHT i o ae JU REAR LEFT PICKUP FRONT LEFT PICKUP ACCESSORY ACCESSORY 10 Place your locomotive on the program track and read the decoder s address with the Atlas Commander or other DCC system refer to system s instructions If the decoder is installed incorrectly you will receive an error code If the decoder is installed correctly you may program the address or other parameters as desired 11 Test the locomotive on the mainline Be sure to test all functions 12 Once you are sure the decoder locomotive operates properly replace the weights and re assemble the locomotive REG Bit 4 Bit 5 Bit 6 Bit 7 Description 1 Output C controlled by F5 1 Output C controlled by F6 1 O
9. nter the appropriate values into CV 67 to 94 before setting this Bit 0 1 16 Bit 5 Extended Addressing O Normal addressing 1 Two Byte extended addressing 0 1 32 Bit 6 always 0 Bit 7 always 0 o 1 Locomotive address 1 127 3 This is the address used to select a locomotive you wish to run 2 Start voltage 0 255 8 This is the vonage applied to the motor in speed step 1 Set this value so that the locomotive just starts moving in speed step 1 3 Acceleration Momentum 0 255 1 Determines the rate of change of speed upon acceleration A higher value leads to a slower acceleration 4 Brake Momentum 0 255 1 Determines the rate of change of speed upon braking A higher value leads to longer brake distance Contains CV29 see CV29 below 0 255 6 Page ee 0 127 1 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 7 Version Number 45 This location stores the version number of the decoder This location is read only 8 Manufacturers Identification Factory reset 127 This value is the manufacturer ID of the decoder Atlas 127 Writing a value of 33 to this Register resets all Vs to their factory condition 17 Extended Address High Byte 192 231 0 18 Extended Address Low Byte 0 255 0 The two byte address if used is contained in V17 18 19 Consist Address 0 255 0 The advanced consist address if u
10. sed is stored in V19 23 Acceleration Trim 0 255 255 This Configuration Variable contains additional acceleration rate information that is to be added to or subtracted from the base value contained in CV3 24 Deceleration Trim 0 255 255 This Configuration Variable contains additional brakin rate information that is to be added to or subtracted trom the base value contained in V4 29 Decoder Configuration Byte 1 0 255 6 Several decoder properties are set with this byte Changes are easiest if done in binary mode but can also 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 50 Bit 0 Decoder Configuration byte 2 Similar to CV 29 but used to set other properties 0 CV23 and CV24 are not active 1 V23 V24 are active and contain the acceleration and deceleration trim values that are added to CV3 or CV4 0 1 2 Bit 1 not used
11. utput C controlled by F7 1 Output C controlled by F8 Function mapping for Output D Same as V54 effective on output D Blinking rate for Outputs C amp D Frequency in Hz 1 0 016 1 V56 Configuration for Output B rear output Not Used 0 Dimming feature disabled 1 the value in CV52 is used for headlight function dimming If CV51 0 0 then F1 dims the headlight if on 0 headlight cannot be dimmed 1 headlight can be dimmed Not used 1 Headlight functions as Gyro Light 1 Headlight functions as Mars Light 1 Headlight functions as Single pulse Strobe Light 1 Headlight functions as Double pulse Strobe Ligh bit is set the higher bit is effective Dimming setting for Output B 0 is Dark 255 is max brightness 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 following 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 defined speed table the intermediate speed steps are calculated by the decoder User Identification 1 User Identification 2 Decoder Software Version read only Note Bits 4 8 only effective if bit 1 is set If more than one Range 0 1 0 1 0 1 0 1 0 255 0 129 0 1 0 255 0 255 Factory Setting
12. values are set electronically so the locomotive does not need to be opened to read or modify these values once the decoder is installed The DMD has a total of 128 CV s Not all of these CV s are currently used and many are reserved for future use All CV s are numbered and each CV controls a different fea ture The NMRA DCC Standards and RP s define the use of some of the CV s however many V s are left for the manufacturers use These CV s may vary from one manufacturer to another Any NMRA DCC Command Station or Programmer such as the Atlas Master DCC Commander can be used fo program all DMD CVs With several entry level systems such as the ROCO DIG ITAL is cool command station only CV 1 locomotive address can be set unless you use a separate programmer 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 pro grammers 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 The following table lists the various CVs supported by the DMD Both the CV numbers and the Register numbers are provided for cross reference Please note Some CVs such as V29 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
13. y priced Atlas HO 4 Function Dual Mode Decoder is packed with all the features you expect from any high end decoder 6 ATLASMASTER DCC SYSTEM j Function Dual Mode Decoder e Selectable for operation with 14 28 128 speed steps or 128 speed table mode with precision glide motor control Two on off function outputs with a current rating of 100mA each that can be configured for directional independent Rule 17 May be dimmed using an extra function MARS or Gyro light e Two additional functions may be configured for independent on off functions or ditch lights with an adjustable blink rate and may be controlled via functions 1 through 8 e Supports Advanced Consist Control and Extended Addressing e Full support for operations mode programming long and short and full support for all forms of programming as described in NMRA RP 9 2 3 Operation on conventional DC layouts while in DCC Mode may be disabled e Provides 1A continuous motor current e Size L 2 88 x W 0 68 x H 0 26 L 40 5mm x W 17mm x H 3 3mm ANALOG DCC JUMPER NOTES The position of the jumper plug 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 holes closest to the edge of the decoder marked Rear as shown below Front Front Front Replace as shown for Analog Mode PREPARING TO INSTALL THE DECODER Before installing your decoder the locomotiv
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