USER MANUAL FOR ATLAS HO DUAL-MODE 4
Contents
1. 29 Bit Locomotive direction 0 This bit sets the direction that the locomotive will move when told to move forward in digital DCC mode 0 locomotive s direction is normal 1 locomotive s direction is reversed 0 1 29 Bit Headlight mode 1 0 Operation with 14 or 27 speed step DCC systems This setting must be selected when the locomotive decoder is used with any DCC system that does not support the 28 speed step mode If the headlights turn on and off as the speed is increased the DCC command station is 1 Operation with 28 55 or 128 speed steps If you use this setting the Command Station must also be configured to use either the 28 speed step mode or the 128 speed step mode otherwise the headlights cannot be controlled configured for 28 speed steps and the decoder is set for 14 speed steps 0 1 2 29 Bit Usage on conventional DC layouts 2 0 locomotive operates only in digital DCC mode 1 locomotive can operate in either analog conventional DC or digital DCC mode 0 11 29 Bit Always 0 29 Bit Speed curve 4 0 Factory default speed curve is used 1 User defined speed curve is used Please enter the appropriate values into CVs 67 to 94 before setting this bit 16 Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder 7 Decimal CV Bit Descrip2. Values 105 User Identification 1 0 255 255 106 User Identification 1 0 255 255 128 Decoder Software Version read only 02 The notation CVx y z means that bit y of CVx has the value z For example CV29 2 0 means that bit 2 of CV29 has the value 0 In the Default Value field the numbers shown in parenthesis are the decimal values that must be written into a CV for the specified bit of that CV to have the binary value 1 Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder 10 Converting Binary Values of Individual Bits within a Configuration Variable into the Equivalent Decimal Value of the Entire CV Reasons for Setting and Clearing the Individual Bits of a Configuration Variable In order to make a DCC decoder perform in the manner that you wish it to perform you must sometimes set or clear individual bits of a CV To program a DCC decoder using a DCC system that allows only the writing of decimal values into CVs such as the discontinued Atlas Master Commander and others it is first necessary to convert the values of all the individual bits of that CV that are to be set to the binary value 1 into their equivalent decimal values It is then necessary to add together all of these equivalent decimal values Procedure for Converting Individual CV Bit Values into a Decimal Equivalent Value for the CV The following table illustrates how to calculate the decimal value
3. address can be read from CV1 and DCC functions can be activated when the DCC system is set to the address in Cvi Check whether to see if an advanced consist address has been programmed into CV19 i e check to see whether or not CV19 has a value greater than 0 If CV19 has a non zero value you must either use this advanced consist address to operate the locomotive or else program the value 0 into CV19 DCC functions can be activated when the DCC system is set to the locomotive address but the locomotive does not move Decoder is set to use a customized speed curve CV29 4 1 but you entered zero values into CVs 67 to 94 Either clear bit 4 of CV29 or else enter suitable non zero speed step values into CVs 67 to 94 The locomotive does not appear to be using the customized speed curve values that you have entered into CVs 67 to 94 Bit 4 of CV29 is not set to 1 Function 0 lighting cannot be switched on and off Matching of speed steps is incorrect The decoder has been set to 28 128 speed steps but the DCC system has been set to 14 27 speed steps Either set the DCC system to 28 128 speed steps or change the decoder speed step setting to 14 27 speed steps CV29 1 0 Locomotive headlights are only illuminated when the locomotive speed is increased or decreased the locomotive headlights go on and off as the locomotive speed changes Matching of speed steps is incorrect The decoder ha
4. and from the rear headlights through the holes in the center pair of terminals on the front and rear ends of the decoder If the lights are LEDs refer to the diagram on page 4 for the proper polarity Reversed polarity causes no harm but the LED will not light Install wire retainers over each terminal to hold the associated wire in place 8 Connect the four wires from the trucks to the four terminals on the four corners of the decoder and install wire retainers over each terminal 9 Connect the motor wires to the terminals on the side of the decoder in the same positions as they were on the light board and install wire retainers over each terminal 10 NOTE The wire retainers should be installed with the notched side up Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder 4 11 Place the locomotive without its body shell on your DCC programming track and read back the locomotive s address from the decoder Refer to your DCC system s instructions If the decoder is properly installed you will be able to read back the factory pre set address 3 If your DCC system does not support reading decoder properties observe carefully the decoder s behavior while the locomotive is on an isolated programming track Each time you try to program the decoder you should see the acknowledgement that is sent by the decoder in the form of a brief and minor jerk of the locomotive A successful acknowledgement means that you have
5. its maximum possible brightness even when dimmed 53 _ Lighting Effects for Outputs C and D 53 BitO Output C blinks when turned on 0 1 0 1 53 Bit 1 Output D blinks when turned on 0 1 0 2 53 Bit2 Outputs C and D function as ditch lights flash alternately when turned 0 1 0 4 on 53 Bits Not used 0 3 7 54 Function Mapping for Output C If CV53 set for ditch lights this function 0 255 1 controls both Outputs C and D 54 Bito 1 Output C controlled by F1 0 1 0 1 54 Biti 1 Output C controlled by F2 0 1 0 2 54 Bit2 1 Output C controlled by F3 0 1 0 4 54 Bit3 1 Output C controlled by F4 0 1 0 8 54 Bit4 1 Output C controlled by F5 0 1 0 16 54 Bit5 1 Output C controlled by F6 0 1 0 32 54 Bit 1 Output C controlled by F7 0 1 0 64 54 Bit7 1 Output C controlled by F8 0 1 0 128 55 Function Mapping for Output D 2 Same as CV54 except effective on Output D 56 Blinking rate for Outputs C and D 0 255 15 Frequency in Hz 1 0 016 1 CV56 57 Lighting Effects for Output B rear headlight 0 57 BitO Not Used 57 Bit1 Rear Headlight Dimming Control 0 1 0 2 If CV57 2 1 the value in CV58 is used for rear headlight dimming with the dimming controlled as follows CV57 1 0 Rear headlight always dimmed CV57 1 1 Dimming controllable as described under CV57 2 57 Bit2 Dimming of Rear Headlight 0 1 0 4 CV57 2 0 Rear headlight cannot be dimmed CV57 2 1 If CV57 1 1 the value in CV58 is used
6. modes and can be programmed by all NMRA compliant DCC systems Remember that the locomotive s 2 and 4 digit addresses stored in CV1 CV17 and CV18 cannot be programmed in Operations Mode Instructions for reading and writing CVs are given in the user manual of your DCC system Note In order for newly programmed CV values to take effect after service mode programming programming on the program track the decoder must go through a power reset If your DCC command station does not support automatic power reset simply rock one side of the locomotive off the track after completing your programming One easy way to do a power reset is e Tip the locomotive to one side so that all the wheels on the opposite side are off the rail e Hold the locomotive in this tipped position for 5 to 10 seconds e Slowly lower the locomotive back down until all wheels are once again on the program track rails This power cycling is extremely important do not omit it Configuration Variables and their Definitions The 342 dual mode 4 function decoder supports many features which are activated by setting Configuration Variables All CVs are numbered These numbers are used during programming and are identical for all decoders that conform to NMRA standards regardless of the decoder manufacturer The following table lists the CVs supported in the 342 dual mode 4 function decoder Some CVs such as CV29 have specific meanings for each bit In order to conform to
7. that must be written into a CV in order to set and or clear a specified set of individual bits within that CV Decimal j Values Each bit of a CV that is to be set to the binary value 1 can be Bit Decimal for CV represented by the equivalent decimal number shown in the Number Equivalent calculation second column of this table To determine the equivalent decimal value to be written into the CV first write as shown in 0 1 column 4 of this table the decimal equivalent values of all the 1 D bits of the CV that are to be set to a binary 1 Write nothing in 3 4 column 4 for each bit of the CV that is to be cleared i e set to 3 8 a binary 0 Then add up all the numbers that you have written A 4 16 in column 34 The sum that you get is the equivalent decimal 5 32 value that you need to write into the CV 5 6A 7 128 SUM Example Calculating the Default Value for CV29 From the definition of CV29 given in Table 1 we see that Decimal the default values of bits 1 and 2 are binary 1s whereas Bit Decimal Values all other bits in CV29 have a default value of binary 0 Number Equivalent for CV In order to compute the decimal equivalent default value of Calculation CV29 simply write in the rightmost column of this table the decimal number 2 for bit 1 and the decimal number 4 0 1 for bit 2 Then add up all the non zero numbers that you 1 2 2 have enter
8. the NMRA convention for bit numbering the CV bit assignments shown in this table use the North American bit numbering scheme of 0 to 7 Table 1 Configuration Variables CVs for the 342 Dual Mode 4 Function Decoder Decimal Default Equivalent Value Of Binary 15 CV Description Range 1 Short address 1 127 3 This is the number that you enter into your DCC system to tell it the locomotive you wish to run with a short 2 digit address 2 Start voltage 1 15 8 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 3 Acceleration Momentum 1 31 1 Determines the rate of change of speed upon acceleration A higher value leads to a slower acceleration 4 Deceleration Brake Momentum 1 31 1 Determines the rate of change of speed upon braking A higher value leads to longer braking distances Contains CV29 see definition of CV29 below 0 55 6 Page Register 0 127 1 Normally this Register is not modified directly by a user For correct operation CV6 should be set to have the value 1 after any use 7 Version Number 46 This location stores the version number of the decoder This CV is read only Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder 6 CV Description Range Default Value Decimal Equivalent Of Binary 15 Manufacturer
9. Also clean any dirt or oxidation from the wheels and pickups to in order to insure that electrical contact is good Now is also a good time to lubricate your locomotive A locomotive that runs well under conventional DC will also run exceptionally well under DCC Precautions to Take When Installing the Decoder Decoder Output Current Draw An internal rectifier supplies the current for all the decoder outputs and has a maximum current rating of 1 2 amps motor plus function outputs Moreover each individual function output is limited to a maximum of 100 ma Although summing up the individual current limits leads to a number larger than 1 2 amps the sum of all currents to the motor and the four function outputs cannot exceed this limit of1 2 amps Example The motor may require as much as 1 0 Amp continuously Hence the current draw of all function outputs combined must not exceed 0 2 A For example if a directional front headlight on Function A requires 50 mA then the load on Functions B C and D must not exceed 150 ma Function Output Voltage The voltage at the four function outputs is about two volts less than the DCC track voltage or about 12 to 13 volts with a nominal 14 5 volts on the track The light bulbs or LEDs that are factory installed in Atlas locomotives already take this voltage into account However any time you connect an after market LED Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder 3 to one o
10. Front Headlight Dimming Control 0 1 0 2 If CV51 2 1 the value in CV52 is used for front headlight dimming with the dimming controlled as follows CV51 1 0 Front headlight always dimmed CV51 1 1 Dimming controllable as described under CV51 2 51 Bit2 Dimming of Front Headlight 0 1 0 4 CV51 2 0 Front headlight cannot be dimmed CV51 2 1 If CV51 1 1 the value in CV52 is used for front headlight dimming with the dimming controlled as follows If CV51 0 0 Dimming and directional headlights both active function F1 dims front headlight If CV51 0 1 Dimming and Rule 17 both active function F4 dims front headlight Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder 8 Decimal z a Default Equivalent CV Bit Description Range Value Of Binary 15 51 Bit3 Not used 0 1 0 51 Bit4 1 Front headlight functions as Gyro light 0 1 0 16 51 Bit5 1 Front headlight functions as Mars light 0 1 0 32 51 Bit 1 Front headlight functions as single pulse Strobe light 0 1 0 64 51 Bit7 1 Front headlight functions as double pulse Strobe light 0 1 0 128 52 The value of CV52 is used for front headlight dimming 0 255 64 Using the value 0 for this CV results in a completely dark front headlight when it is dimmed Using the value 255 for this CV keeps the front headlight at
11. HO Dual Mode 4 Function Decoder ll USER MANUAL FOR ATLAS HO DUAL MODE 4 FUNCTION DCC DECODER ITEM 342 By Dual Mode we mean that the Atlas 342 HO 4 function decoder has a jumper plug that allows the modeler to select between DC only operation or DCC and DC operation With the plug in the DC only position a decoder equipped locomotive runs on a standard DC powered analog layout with no speed differential when compared to a similar non decoder equipped locomotive The 342 HO Dual Mode 4 function decoder can be used with all popular NMRA compliant DCC systems This decoder is in full conformance with all NMRA Standards and Recommended Practices and has been augmented to work well with all major DCC systems on the market It can be installed in most Atlas HO scale engines with a motor mounted lighting board produced since 1985 except for the S series Alco switchers and the AEM 7 ALP 44 locomotives and may also be installed in a number of locomotives from other manufacturers Please note that this decoder does NOT fit into Atlas HO Silver Series locomotives Atlas Silver Series locomotives are the DCC ready counterparts of DCC and sound equipped Gold Series locomotives The reason why it does not fit is that the 342 decoder is too long to fit into the opening in an Atlas HO Silver Series chassis Although the 342 decoder has been discontinued and is no longer available from Atlas this document is being re issued to provide
12. ed into this rightmost column Since the sum of 2 4 4 these two numbers is 6 the decimal number to be 3 8 programmed into CV29 is 6 4 16 5 32 6 64 7 128 SUM 5 Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder 11 Creating a Customized Speed Curve Common reasons for specifying a customized speed curve for a DCC equipped locomotive are to 1 Insure that dissimilar locomotives have the same performance characteristics 2 Have model locomotives perform more prototypically In this example of creating a customized speed curve we will assume that the 342 dual mode 4 function decoder has been properly installed and tested We also assume that you are familiar with the general process of programming CVs using your DCC system The first step in creating a customized non default speed curve is to assign a value to each internal speed step This assignment is done by specifying a value for each of the CVs from CV67 to CV94 using a table such as that below but substituting your desired speed step settings for the default CV values given in the nternal Speed Step Value column of this table This assignment of values to the 28 speed steps is MUCH easier if you use a computer program like Decoder Pro The second step is to write the value listed in the Internal Speed Step Value column into the CV corresponding to that speed step The third and final step is to activate your customized speed curve by writi
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14. f these function outputs you must make sure there is a 1000 ohm resistor in series with one lead of this LED IMPORTANT WARNINGS Although the 342 decoder has many internal safeguards to prevent damage please follow these guidelines 1 DO NOT allow any metal part of the locomotive to touch any metallic part on the 342 decoder PC board This action 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 Kapton tape preferably or electrical tape over any part of the locomotive frame or body that might touch metal parts on the decoder This method of insulation will prevent short circuits without suffocating the decoder 3 After removing all connections from the original light board there must be no electrical connection between the motor and the rail pickups 4 If you need to extend any wires leads use 26 gauge stranded insulated wire Solder the splice and insulate all soldered connections with very thin heat shrink tubing 5 Solder using a low 20 to 25 watts max wattage or temperature controlled soldering iron with a very fine tip any wires you need to connect to the four function FC and function FD soldering tabs on the 4 function decoder Step by Step Installation The 342 4 function DCC decoder is designed to be installed in locomotives that ha
15. for rear headlight dimming with the dimming controlled as follows If CV51 0 0 Dimming and directional headlights both active function F1 dims rear headlight If CV51 0 1 Dimming and Rule 17 both active function F4 dims rear headlight 57 Bit3 Not used 0 1 0 Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder 9 Decimal A ee Default Equivalent CV Bit Description Range Value Of Binary 15 57 Bit4 1 Front headlight functions as Gyro light 0 1 0 16 57 Bit5 1 Front headlight functions as Mars light 0 1 0 32 57 Bit6 1 Front headlight functions as single pulse Strobe light 0 1 0 64 57 Bit7 1 Front headlight functions as double pulse Strobe light 0 1 0 128 Note Bits 4 7 of CV57 effective only if bit O is set If more than one bit is set the highest bit is effective 58 The value of CV58 is used for rear headlight dimming 0 255 64 Using the value 0 for this CV results in a completely dark rear headlight when dimmed Using the value 255 for this CV keeps the Rear headlight at its maximum possible brightness even when dimmed 67 Speed Step Values for Customized Speed Curve 0 255 Factory to These CVs are used to specify the speed step values for a customized speed Default 94 curve The factory default values for these CVs are specified in Table 2 on page Speed 11 Refer to Creating a Customized Speed Curve Step
16. installed the decoder correctly If the decoder is installed correctly you may program the address and other parameters as desired 12 If the decoder has been installed incorrectly you will receive an error code Remove the locomotive from the programming track and correct any installation errors 13 Once you have successfully programmed the decoder reinstall the weights and the body shell Then test the locomotive on the mainline Be sure to test all functions If this test is successful the locomotive is ready to use LEFT REAR RAIL LEFT FRONT RAIL POWER PICKUP POWER PICKUP MOTOR LEADS Be m E FA REAR an FRONT LIGHT nn LIGHT B 5 VE I DIGITAL MODE j l JUMPER POSITION FG 4 VE VE FD RIGHT REAR RAIL RIGHT FRONT RAIL POWER PICKUP POWER PICKUP VE IS THE POSITIVE COMMON RETURN LEAD FOR ALL FOUR FUNCTIONS FA FB FC FD Top View of Atlas 342 4 Function Decoder Showing Locations of the Function Outputs Programming the Dual Mode 4 Function Decoder Many characteristics of the 342 dual mode 4 function decoder can be programmed to customize the decoder to its locomotive Please read The Configuration Variables and their Definitions section for details on the configuration variables supported by the 4 function DMD The 4 function 342 decoder supports all forms of programming described in NURA Recommended Practice 9 2 3 including both the user friendly Direct Mode on the program t
17. modelers who have older Atlas HO Master Series HO locomotives equipped with 342 decoders with an up to date user manual As substitutes for the no longer available 342 Atlas recommends either the NCE DA SR or the TCS A4X Both of these decoders are drop in replacements for the 342 decoder and both the DA SR decoder and the A4X decoders have many more features than the 342 decoder had MODEL RAILROAD CO INC Item 342 DISCONTINUED Manual Revised 05 19 2015 Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder 2 The Atlas 4 function decoder has most of the features that you would expect from a modern high end DCC decoder e Dual Mode DC only or DCC and DC Operation e Two on off DCC unction outputs with a current rating of 100 mA each that can be configured for directional or independent Rule 17 lighting This lighting is dimmable with DCC function keys Moreover each output may optionally be configured as a Gyro light Mars light single pulse Strobe light or double pulse Strobe light e Two additional function outputs that may be configured for independent operation or as Ditch Lights with an adjustable blink rate These outputs may be controlled via DCC functions 1 through 8 e Supports both short 2 digit and long 4 digit addressing e Advanced consist control operating and controlling several locomotives as if they were a single entity by sending speed and direction commands to a common con
18. ng the binary value 1 into bit 4 of CV29 i e CV29 4 1 Unless this bit in CV29 has been set to a binary 1 the default speed curve that was preset into the decoder at the factory will be used instead of the custom speed curve that you intended to use Table 2 Default Speed Step Values for Atlas 342 Dual Mode 4 Function Decoder Speed Stepin Speed Step in ee cv 14 27 Step Mode 28 Step Mode dais shown 1 1 4 67 2 6 68 2 3 12 69 4 16 70 70 3 5 20 71 6 26 72 72 4 7 32 73 8 38 74 74 5 9 44 75 10 50 76 76 6 11 58 77 12 66 78 78 7 13 74 79 14 82 80 80 8 15 90 81 16 100 82 82 9 17 110 83 18 120 84 84 10 19 130 85 20 140 86 86 11 21 152 87 22 164 88 88 12 23 174 89 24 186 90 90 13 25 200 91 26 216 92 92 14 27 234 93 28 254 94 94 In order to calculate the correct speed step value for the 128 speed step mode the dual mode 4 function decoder will internally average the values for 28 speed steps that were specified in CVs 67 to 94 Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder Troubleshooting Decoder Programming Problems Fault Cause and solution Locomotive does not move when you address it on DCC system Check to see if you have selected the correct address for that locomotive Locomotive does not move when DCC system is set to the address in CV1 even though this
19. rack and Operations Mode on the main line For example you can operate the decoder with the factory default speed curve or you may specify your own customized speed curve You can also set which end of the locomotive is to be the forward end You can also decide whether or not you want to be able to operate the locomotive on conventional DC layouts If your DCC system supports Operations Mode programming you can change the values of all CVs while the Atlas Model Railroad Company Inc HO Dual Mode 4 Function Decoder 5 locomotive is on the main line except for the locomotive s 2 and 4 digit addresses which are stored in CV1 CV17 and CV18 The customized properties you set with CVs are saved in non volatile memory locations on the decoder so that they will retain their values even after power has been removed All parameter values are set electronically which means that the locomotive does not need to be disassembled again after the decoder has been installed in order to read or modify the values of these Configuration Variables CVs The 342 dual mode 4 function decoder has a total of 128 CVs Any NMRA compliant DCC Command Station can be used to program the 3422 dual mode 4 function decoder With several entry level DCC systems only CV 1 the 2 digit locomotive address can be set unless you use a separate DCC programmer More advanced DCC systems support the ability to set many more CVs The 342 decoder supports all programming
20. s been set to 14 27 speed steps but the DCC system has been set to 28 128 speed steps Either set the DCC system to 14 27 speed steps or change the decoder speed step setting to 28 128 speed steps CV29 1 1 Atlas Limited One Year DCC Decoder Warranty Please fill out and mail the Warranty card within 30 days of purchase 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 purchase If the decoder fails during the warranty period uninstall it from the locomotive and carefully pack the uninstalled decoder in tits original Atlas packaging Also send a copy of the dated sales receipt and return to Atlas Model Railroad Company Attn HO N Repair 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 For Technical Assistance www atlasrr com dcc ailasrr com This equipment complies with Part 15 of FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference 2 This device must accept any interference received including interference that may cause undesired operation Please Save this Manual for Future Reference Lenz GmbH manufactured the 342 dual mode 4 function decoder for Atlas Mod
21. s Identification This value is the manufacturer ID of the decoder Atlas 127 Writing the decimal number 33 to CV8 AND DOING A POWER RESET will reset all CVs in the decoder to their factory default values EXCEPT FOR the Speed step settings in CV67 to CV94 127 17 Long Address High Byte The long also called extended address if used is contained in CV17 and CV18 192 231 18 Long Address Low Byte 0 255 19 Advanced Consist Address The Advanced Consist address if used is stored in CV19 0 255 23 Acceleration Trim This CV contains additional acceleration rate information that will be added to or subtracted from the base value contained in CV3 0 255 255 24 Deceleration Trim This CV contains additional braking rate information that will be added to or subtracted from the base value contained in CV4 0 255 255 29 Decoder Configuration Byte 1 Several decoder properties are set with CV29 If your DCC system supports Binary Mode changes are easiest if done in binary mode but the changes can also be done by adding together the decimal values shown in parenthesis for all the desired features and writing the total into CV29 For an example see the section Converting Binary Values of Individual Bits within a Configuration Variable into the Equivalent Decimal Value of the Entire CV on page 10 The definitions for the individual bits of CV29 are given below 0 55
22. sist address that is stored in the decoder of every locomotive in the consist i e Advanced Consisting e Support for all forms of programming described in NMRA RP 9 2 3 including Operations Mode programming programming on the main line e Full support for all the various motor speed step modes including the 128 speed step mode e Choice of Silent Drive or Precision Glide motor control e Operation on conventional DC layouts while the decoder is in DCC Mode may be disabled e Decoder provides 1A continuous motor current e Size 2 88 L x 0 68 W x 0 26 H 40 5mm L x 17mm W x 3 3mm H ANALOG DCC JUMPER PLUG The position of the jumper plug determines the mode of the decoder See the figure on page 4 To operate the decoder the Analog DC only mode move the jumper plug to the four holes closest to the end of the decoder marked Rear in the figure on page 4 Conversely to operate the decoder in Digital Mode either DCC or DC move the jumper plug to the four holes in the PC board that are closest to the center of the locomotive as also shown in the figure on page 4 Make certain that the 8 pin plug is firmly inserted into all four holes in the locomotive PC board Preparing to Install the Dual Mode 4 Function Decoder Before installing the 342 decoder in your locomotive it is necessary to test and adjust if necessary the locomotive for proper operation on conventional DC power Replace any worn out parts such as brushes
23. tion Range ae arena 15 29 Bit5 2 digit or 4 digit Addressing 0 1 0 32 0 Short 2 digit address used 1 Long 4 digit address used 29 Bit6 Bit 6 always 0 0 0 29 Bit7 Bit 7 always 0 0 0 50 50 Decoder Configuration Byte 2 0 15 1 CV50 is similar to CV29 but CV50 is used to set other properties The definitions for the individual bits of CV50 are given below 50 BitO Not used 0 1 1 50 Biti 0 CV23 and CV24 are not active 0 0 1 2 1 CV23 amp CV24 are active and contain acceleration and deceleration trim values that are added to or subtracted from CV3 and CV4 respectively 50 Bit2 Brake momentum on DC operation 0 1 0 4 Used to achieve prototypical braking at red signal indications if conventional DC control is disabled CV29 2 0 0 locomotive proceeds with track voltage dependent speed inside the conventional DC section 1 locomotive brakes in the conventional DC section with a pre set brake momentum 50 Bit3 Motor Drive Selection 0 1 0 8 0 Precision Glide Control 1 Silent Drive 50 Bits Not used 4 7 51 Lighting Effects for Output A front headlight 0 Note Bits 4 7 of are CV51 effective only if bit 0 is set If more than one bit is set the highest bit is effective 51 BitO Directional or Independent Headlights 0 1 0 1 CV51 0 0 Headlights are directional CV51 0 1 Headlights are independent per Rule 17 with FO controlling front headlight and F1 controlling rear headlight 51 Bit 1
24. ve a motor mounted light board except for Atlas Silver Series locomotives It may also be installed in locomotives without a motor mounted light board by connecting 26 gauge or finer wire leads to the decoder terminals using the supplied wire retainers The following steps are for installation in Atlas decoder ready HO locomotives except for Atlas Silver Series locomotives The steps for installation into other manufacturer s locomotives may vary 1 Remove the shell from your locomotive Refer to the locomotive manufacturer s 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 to connect these wires to the decoder in the same positions as they were connected to the light board 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 decoder over the locomotive Place one of the holes in the DMD over one motor mount and pull towards the other motor mount Then lower the 4 function decoder in place 7 Insert the two wires from the front
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