
SPROG IIv4 User Guide 7
Version 1.1 April 2021 © Copyright 2021 SPROG DCC Ltd
Strip 6-8mm of insulation from each conductor and twist the copper
cores of each conductor together
Insert the positive conductor the +V terminal and tighten the screw
Insert the other conductor in the 0V terminal and tighten the screw
SPROG II is protected against reverse polarity connection of the power
supply but will not work unless the polarity is correct.
The power LED will only illuminate steadily when power is connected to a
SPROG IIv4 and the USB is connected to the host computer (next step).
The power LED will only illuminate steadily when power is connected to a
SPROG IIv3.
The power LED will flash when power is being applied to the track ouput.
Install the USB Drivers (if required)
Please refer to the appropriate document for your operating system on the
SPROG DCC Ltd website https://www.sprog-dcc.co.uk/download-page.
Getting Started with JMRI (DecoderPro and PanelPro)
DecoderPro and PanelPro are different interfaces to the same underlying
JMRI software. The split exists for historical reasons only. There are some
differences in the functions that are available from the menus but a lot of
features are available through both interfaces.
It has become customary to think of DecoderPro as the tool for programming
decoders and PanelPro for controlling a layout.
DecoderPro will often be used with a dedicated programming track for
‘service mode’ programming. This allows full read and write access to all
Configuration Variables (CVs) in a single decoder.
PanelPro will often be used with ‘on the main’ or ‘ops mode’ programming in
conjunction with layout control. In this mode CVs may be written, but (without
special hardware such as Railcom) values cannot be read back. The SPROG
II does not support reading from decoder in ops mode. The advantage of ops
mode programming is that any loco, out of all the locos on a layout, may be
programmed. Unlike service mode there is no single loco limit.
We will use that distinction (DecoderPro for service mode programming and
PanelPro for ops mode programming) in discussing the use of the SPROG II.