DCC Pocket Tester
Buy Pricom Design
Attention DCC geeks, here is the ideal testing
Test DCC Signals to Verify Your Power Boosters and
Track are working the way they should! Fast, Powerful, Accurate,
and Track Powered!
The DCC Pocket Tester is the only low-cost, portable,
reliable, and accurate way to test and verify the DCC Protocol.
The unit is completely powered from the DCC Signal, so no batteries
to change, no power cord to remember, and NO PC required, which
makes it the ultimate tool for your toolbox.
- Bit Summary
A good quick-view into your DCC system from the Bit Level.
- Bit Totals
Detail showing the Total Bits, as well as the Total ONE and Total
- Bit Timing
- Bit Errors
- Packet Summary
- Packet Timing
- Packet Lengths
- Packet Errors
- Address Summary
- Address List
- Data Summary
- Data Monitor
The DCC Pocket is a product of Pricom
Design. There are two versions available:
Complete DCC Pocket Tester (Black)
Includes the DCC Pocket Tester, 24" Alligator Clip Test Lead
Set, PC Serial Cable for Firmware Updates, and printed users manual.
Lite Edition DCC Pocket Tester (Black)
Includes the DCC Pocket Tester (Lite Edition), 24" Alligator
Clip Test Lead Set, PC Serial Cable for Firmware Updates, and on-line
users manual. Does not support One Bit Timing, Zero Bit Timing and
Bit Errors. MSRP $129.00.
Pricom Design has released a DCC pocket tester. It
measures 5 .75 x 3.63 x 1.25, so it will just fit into your pocket.
It is designed to read the quality of the DCC data on your layout.
Through the use of 17 different menus, the measured data are presented
in various formats that allow you to completely examine how your
DCC system is performing on your layout.
website states that the unit is designed for people building
a DCC Command Station, Power Booster, or other DCC Powered Device,
so the DCC Pocket Tester is not designed as tool for use by all
model railroaders. Small layouts will not benefit from the use of
the DCC Pocket Tester unless you simply like to add gadgets to your
layout. Large club layouts, however, might want to consider adding
a DCC Pocket Tester to their arsenal of DCC equipment. Large layouts
can start to show problems in DCC due to the length of the track
runs. As the length of the track becomes longer, the layout can
start to act as a transmission line. This means that the layout
is large enough that the DCC pulses take a significant amount of
time (in electrical time at least) to move around the layout. Earlier
pulses can reflect from various points in the layout. Due to the
time it takes them to move from one point to the other, they can
actually interfere with later DCC pulses. In essence, this effect
can cause DCC errors and strange, random behavior. Also, on large
layouts, the amount of DCC traffic on the rails can cause response
delays due to packet congestion. The DCC Pocket Tester is the tool
of choice to help analyze these types of problems.
The DCC Pocket Tester has a 2.6 x 1.5 LCD dot matrix
display. This allows the internal processor to show the measured
data in a multi-line user friendly format. The unit has four arrow
buttons for navigating through the various menus. A simple power
connector ties the unit to the track. This input provides the DCC
data and the power to operate the unit; no batteries or other power
source are required. In addition to the power input, there is an
RS-232 port for downloading software upgrades, and a PNET port for
attachment to the Pricom RS-485 network. A SEL button is not mentioned
in the directions, but appears to reset the measurements in each
The unit I received had Version 1.0 software. The
website indicated that the latest configuration is Version 1.3.
I downloaded the PC Update software, the new configuration file,
and a .NET file from the Pricom website. Per the user manual, I
first installed the .NET software. This is actually software from
Microsoft that relates to the installation environment. I then installed
the Pricom Universal Uploader software. I followed the user manual
directions and connected the DCC Pocket Tester to my computer's
COM 1 RS232 port using the included cable and then started the upgrade
software. I followed the user manual directions for updating the
unit, and found that everything worked smoothly as stated in the
instructions. Although the .NET file is over 23 MB and took some
time to download, I had no problem at all upgrading the unit to
Version 1.3. Pricom is to be commended for their smooth, simple
approach to upgrading software.
After upgrading, I connected the DCC Pocket Tester
to my layout. The initial Quick Summary menu showed the DCC system
working correctly. The next menu, Bit Summary, showed normal bit
operation. This menu also contains an indication of the DCC voltage.
With a DCC voltage of 13.9 volts, the Pocket Tester read 13.7 to
14.0. This is somewhat more error than their stated value of 1%.
The directions do say that this reading is not RMS, and therefore
is approximate. I found that the fast update rate for the voltage
made it difficult to read the tenths of a volt digit since it was
Several menus give statistics on the length of one
and zero bits and the number of bits failing to meet NMRA standards.
These menus can help large layouts if there is bit interference
problem. A packet summary menu gives the total packet count and
the number of bad packets. This menu also gives the packet rate.
On large layouts, control response can be limited by the packet
rate. This is essentially how many commands can be sent in a second.
With a large number of operating engines, the packet rate can limit
the response time of an engine or accessory to a cab command.
Rather than detailing all of the menus here, I recommend
that you go to the Pricom website (see above) for a detailed description
of all of the DCC Pocket Tester functions. One problem I did find:
the Pocket Tester does not have a separate display function for
accessory addresses. Engine addresses and accessory addresses use
different formats. The DCC Pocket Tester interpreted accessory addresses
as engine addresses. The result is that some of the menus were contaminated
with incorrect addresses that resulted from issuing macro commands
to accessories. For example, the Pocket Tester reported the use
of address 9465. This address is actually an accessory address interpreted
as if it were an engine address. Hopefully, a future update will
correct this problem and provide a separate menu item for accessory
The DCC Pocket Tester is a well designed unit intended
mainly to help verify command station and booster performance. For
large layouts with high traffic volumes, the DCC Pocket Tester is
useful to help determine where and when DCC errors are occurring.
It can help isolated bit distortion and packet congestion problems
that manifest themselves as unstable performance on large layouts.
The DCC Pocket Tester is easy to upgrade, with Pricom indicating
on their website the intention to provide future performance improvements
as they are warranted.