TDC-12, TDC-8, DB-400 & DB-100

The TDC-12 is the currently sold hand-held unit used to do a variety of traffic studies. The TDC-8, DB-400, and DB-100 are no longer in production, but we still provide support for these units.

If you do not find an answer to your problem/question, please call 1-888-833-7260.

What is the difference between the TRAX units?
View a comparison chart of the various TRAX units.

What is the difference between the TDC-12, TDC-8, DB-400 and DB-100?
The TDC-8 and DB-100, DB-400 are no longer in production. The TDC-12 provides all the capabilities of these units and more.

My computer does not have a serial port for download. What can I do?
All JAMAR equipment that interface with a computer currently use a serial (Com) port to do so. However, if you do not have a serial port on your computer (or there is a conflict with another device), you can use a USB port by using a USB to Serial Adapter. These devices allow serial peripherals, like JAMAR equipment, to interface with a USB port.

Why won't my counter download to the software?
There are several possible reasons why a counter may not download to the software.

1. You must use a standard JAMAR universal cable for the download to work correctly. The counters have a custom configured output and may not work with a standard serial cable. Use of a cable other than the JAMAR universal cable could cause data to be lost or damage to occur to to your equipment.

2. The baud rate used for the download must be set the same in the counter as in the software. To set the baud rate in a counter, tab to Dump, then press the Do key. Next, tab to Baud, press the Do key and select the proper baud rate.

3. There may be a conflict with how your software is configured. Call for more help, 1-888-833-7260.

A Real Time Clock Data Error occurs when I turn my unit on. Why?
There are several possible causes for this error. Call for more information

I did a serial port test on my counter and it failed. Why?
You may not have been using a test connector for the test. The serial port test requires a test connector to connect pin 2 (the output) to pin 3 (the input) for the test.

Can I look at the data without downloading to the software?
In most cases, yes. Although designed to download to the PETRAPro software, data can be viewed on the counter itself.

How long do the AA batteries last?
Approximately two months with average use. We recommend keeping a replacement schedule either in the carry case or on the back of the counter and replacing every two months.

How can I keep the counter from beeping every time I hit a key?
At the main menu, Tab to Utilities and press Do. Tab to Options and press Do. Select beeper and then select OFF. Even though you chose to turn off the beeper the counter will still triple beep at the end of every interval to let you know another interval has passed.

What are the 1, 5, 9 and 13 keys used for?
These are designated as the 'Other' keys can can be used to count anything you want. The most common use is to count pedestrians, bicycles, or other things that could affect traffic.