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Programming with Selectrix Devices
In Selectrix data format only 5 parameters are programmable. As opposed to DCC format this
makes only restricted programming possible.
Selectrix Description
Value range of Selectrix
Centre
CV
Programming Value for the
decoder CV
Locomotive address
1-111
1
1-111
Top speed
0
1-7
59
5
1 (analog operation)
56, 88,120, 152, 184, 216, 248
Start/brake inertia
1-7
3 and 4
1, 5, 9, 13, 17, 21, 25
Pulse width
1-4
2
1, 3, 5, 7
Signal stop section
1 or 2
CV49 – Bit 1
0, 1
Table 1: Cross reference between the input on a Selectrix programming device and programmed CV’s
CV programming with Selectrix Devices
In order to also program all the CV with Selectrix devices we use the following method:
We use a special programming mode which employs the memory locations for ‘Signal stop
section’, ‘Top speed’, ‘Start/brake inertia’ to specify to the decoder, the CV number, the memory
for the ‘address’ and ‘pulse width’ to program this CV.
1 – Address
2 – Signal brake section (BS)
3 – Top Speed (TS)
4 – Start/brake inertia (SB)
5 – Pulse width
Assignment of functions on the display in Selectrix programming mode
Step 1.
You enter the special programming mode by entering an address value of 0 and pulse width value of 4.
Note: Because address 0 is used to place the decoder into programming mode it cannot be used as a normal
address.
Now tell the decoder which CV you wish to call up. Look for particular values for Signal brake
section (BS), Top Speed (TS) and Start/brake inertia (SB), in the programming table and
program the decoder.
After the programming the decoder will be in CV programming mode and desired CV can be
read or programmed.
Step 2.
The decoder can now be read with the programming device, the CV value can be determined from the
contents of ‘Address’ and ‘Pulse Width’:
CV contents = Address d (Pulse width display - 1) * 100
Step 3.
If the CV is to be changed then the value for ‘address’ and ‘pulse width’ must be changed in the programming
device.
Note: The value for ‘Signal brake section’ (BS), ‘Top Speed’ (TS) and ‘Start/brake inertia’ (SB), which specify
the CV number must not be changed or the programming will not be completed.
It means:
CV contents = Address d (Pulse width display - 1) * 100
Where the ‘Address’ value is between 0 and 99 and the ‘pulse width’ between 1 and 3.
If the values have been changed on the programming device they will be written to the decoder.
The programming of the CV can be verified by reading the decoder.
