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Chapter 3 TROUBLESHOOTING
A very easy way to troubleshoot these boards is to use a jumper wire to join together the BLUE and
WHITE lines and another jumper wire to connect the BLACK and YELLOW lines on the 6 position
terminal strip. (Make sure you have no other devices connected on the RS485 lines and disable the local
echo function on the terminal emulation program.) This results in a closed loop and therefore whatever
you type on a computer terminal emulation program (such as Procomm, Hyper Terminal or Windows
Terminal) should be echoed back to the screen if the board is working properly. If the echo-on feature in
the program is selected, then you would get each character twice.
The Baud rate as well as the number of bits or the stop bit are all irrelevant. Should it not work properly,
the first thing to check is that the board is powered properly, and secondly, to move the jumpers to the
appropriate positions on both H1 and H2. (Note: The jumpers should always be both on the same relative
positions. That is, closing either pins 1-2 with both H1 and H2 or 2-3 with both jumpers.)