HamGadgets Noxas ID-O-Matic II, Руководство пользователя

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ID-O-Matic II Manual 02/27/2010 Page 7 of 14
and no (unused) INHIBIT. The COR jumper is connecting the center and L pins, and the INH jumper is
left open.
Additional Solder Pads:
You will note there are three additional solder pads to the right of the PIC processor, marked A3, A4 and
B0. These are for some additional signals that are not commonly needed, but are available should you
have a use for them.
Pad
Function
A3 ID Indicator. This is an unbuffered, 0-5 V output signal that goes HIGH when the ID
message is being sent, and LOW at all other times. It is only active while the ID is being
transmitted, with no lead or tail time.
A4 Unused at this time, reserved for future application.
B0 TEST/ALT MSG input. This input is dual purpose. If this input is held LOW when power
is applied or the ID-O-Matic II is reset, it will send the version number, ID Msg, Beacon
Msg and Alternate Msg (if they are set), separated by slant bars. After initial power up,
this input can be used to select the Alternate Msg (if it is set) to be sent in place of the ID
Msg. This can be used to send an alternate ID message when needed to indicate primary
power failure or for whatever other purpose you may have in mind.
Note that the ALT MSG and RESET inputs may be left floating (unconnected) if not used, and are not
equipped with input signal protection as the COR and INHIBIT inputs are. Be careful not to exceed 5V
on these inputs! These are active-low logic inputs, meaning they are active when grounded or driven
below 0.5V. If you need to use a signal source that may exceed 5V, you must use some method of
limiting the input signal to a range of 0V to 5V. You can use a simple Zener diode circuit as shown
below to reduce the voltage to a compatible level.
L H L H
INH COR