LGB 55025 Switch Decoder CV settings

Having been asked on another thread about CV settings for the LGB 55025 switch decoder, I thought it best to post my answer here in a new thread for easy reference:
 
The LGB55025 switch decoder allows you to control 4 seporate point motors using independant accessory addreses.  It is possible to control up to 2 point motors off off a single output but i will come to that later.
 
In order to program the unit, the "Prog" terminals should be bridged, a load connected to the "A" terminals (a point motor is ideal) and the "In" termianls connected to a suitable device to perform the programming, this could be the programming track of your central station, the LGB programming module (55045) or the LGB universal handset (55015) with the programming insert.
 
Each swith decoder can be assigned a bank of 4 addresses, the first bank being address 1 thru 4 (default), the next being 5 thru 8, 9 thru 12, etc up to 125 thru 128.
 
Each of the outputs (A - D) can be configured by setting the relevant CV value to:

• provide an output to drive a EPL switch drive (default)
• provide a constant on/off type output
• provide an asynchronous flashing output. 

This operating mode changes the direction of the current. This means that the terminal alternates between a positive and a negative wave form. To be able to use this, you need a polarity-dependent device.

• provide a synchronous flashing on/off output

  
 
CVs

• 1    Switch decoder address (1-128).  Set this CV to one of the address values in the block of addresses you require, i.e. setting CV1 to 6, will select the 5 thru 8 address block.
• 2     Terminal A options (0-255)
• 3     Terminal B options (0-255)
• 4     Terminal C options (0-255)
• 5     Terminal D options (0-255)

 
Options values:
The terminal options are defined by a "Time" value, a "Polarity" value and a "Function" value these should be added together and programmed into the relevant CV.
 
Function value
This defines how the output behaves:

•     0 - EPL drive
•   64 - On/Off
• 128 - asynchronous flashing
• 192 - synchronous flashing

 
Polarity value
This specifies the polarity of the output:

•   0 - Normal
• 32 - Reverse

 
Time value
This specifies the time period that the function operates and is dependant upon the function being used:
 
EPL - pulse duration (value=duration in seconds):
0=0.3, 1=0.4, 2=0.5, 3=0.6¹, 4=0.7, 5=0.8, 6=0.9, 7=1.0², 8=1.17, 9=1.33, 10=1.5, 11=1.66, 12=1.83, 13=2.0, 14=2.15, 15=2.3, 16=3.0, 17=3.5, 18=4.0, 19=4.5, 20=5.0, 21=5.5, 22=6.0, 23=6.5, 24=11.0, 25=16.0, 26=19.0, 27=24.0, 28=29.0, 29=34.0, 30=39.0, 31=Continious
Note ^{1 Default value}
Note ^{2 Recomended value when switching 2 switch drives from the same output.}
 
On/Off - Duration of "on" period (value=duration in seconds):
0=0.3, 1=0.4, 2=0.5, 3=0.6, 4=0.7, 5=0.8, 6=0.9, 7=1.0, 8=1.17, 9=1.33, 10=1.5, 11=1.66, 12=1.83, 13=2.0, 14=2.15, 15=2.3, 16=3.0, 17=3.5, 18=4.0, 19=4.5, 20=5.0, 21=5.5, 22=6.0, 23=6.5, 24=11.0, 25=16.0, 26=19.0, 27=24.0, 28=29.0, 29=34.0, 30=39.0, 31=Continious
 
Asynchronious Flashing - Duration of "on" period (value=duration in seconds):
0=0.14, 1=0.43, 2=0.713, 3=1.0, 4=1.25, 5=1.5, 6=1.75, 7=2.0, 8=2.29, 9=2.57, 10=2.85, 11=3.14, 12=3.42, 13=3.71, 14=4.0, 15=5.0, 16=6.0, 17=7.0, 18=8.0, 19=9.0, 20=10.0, 21=12.0, 22=14.0, 23=18.0, 24=36.0, 25=40.0, 26=44.0, 27=53.0, 28=62.0, 29=71.0, 30=80.0
 
Synchronious Flashing - Duration of "on" period (value=duration in seconds):
0=0.14, 1=0.43, 2=0.713, 3=1.0, 4=1.25, 5=1.5, 6=1.75, 7=2.0, 8=2.29, 9=2.57, 10=2.85, 11=3.14, 12=3.42, 13=3.71, 14=4.0, 15=5.0, 16=6.0, 17=7.0, 18=8.0, 19=9.0, 20=10.0, 21=12.0, 22=14.0, 23=18.0, 24=36.0, 25=40.0, 26=44.0, 27=53.0, 28=62.0, 29=71.0, 30=80.0
 

Thanks Mark: a very useful summary - much easier to follow than the "instruction" booklet
 

wibble!!!

So to clarify Mark, it looks like in my case, where I want to lengthen the pulse for a 2 point motor set up as discussed , I read my settings for CVs 2-5 and add 4?
 
Therefore, I should expect to read either a value of 3 and change to 7, or if the polarity is reversed,  a value of 35, which I can change to 39?
 
I doubt my polarity is reversed though, as I've just swapped the wires on the point motor to make the left button the left route and ditto for the right....

I would just set the respective CV (2-5) to 7 regardless and not worry about the polarity as easier to swap the cabling if the motor works in the opposite direction.

Thanks for the easy to understand explanation, Mark.  I'll have to print it out and save it for future use.

Sorry, I'm new to programming Switch decoders. Can you please spell it out in simple terms for a simple person.
I want to switch 2 sets of points from one address. Many thanks

1) Connect tboth points to the one output of the switch decoder.
2) Program 2 switch decoders with the same address.

2000massey


Sorry, I'm new to programming Switch decoders. Can you please spell it out in simple terms for a simple person.
I want to switch 2 sets of points from one address. Many thanks

Wire up each pair of motors to each decoder output.
 
This diagram shows a pair of motors wired to the first decoder output....

Attached Image(s)

Thanks for this, but do I need to change any CV values? or just wire the point up. changin CV's is a bit scarey for a newcomer.
I am using a 55015 remote.
 
Dave

 
my eye my eyes,,,,,, there burning!!!!!!!
 
2 pairs of pants on head req,,,,,,,

2000massey


Thanks for this, but do I need to change any CV values? or just wire the point up. changin CV's is a bit scarey for a newcomer.
I am using a 55015 remote.

Dave

The default addresses are 1,2,3 & 4, so if it's your first decoder, then you shouldn't need to change these unless you want different numbering.
 
Once connected, use your Remote, go to Function 1, you will get an 'S' for switch, enter 1 ( for 1st  address ) and use the  left and right arrow buttons to change the point motor.
 
BTW, welcome to the forum....

Thanks again, my first decoder should arrive with me soon.
I will let you know how I get on.
regards,
Dave

Tried it today, it works, cannot believe it was so simple. Many thanks.
 

2000massey


Tried it today, it works, cannot believe it was so simple. Many thanks.

Nice one!
 
Are you using a 55025 for 4 points or a 33024 for a single motor....