Using the SRC8 to
Indicate a Route
The SRC8 provides a convenient way to
control routes. Sometimes it may be important to
indicate which route is active. In this example five
routes will be defined to access five tracks in a yard
ladder.
Each route will be activated by a push button connected
to a SRC8 input and the respective output will indicate
the active route. The SRC8 address is set so that each
route has a pseudo switch (not a physical switch) address
as it's execution address. This is also the address the
controls the output LEDs. When a button is pressed a
route execution switch address is send. The respective
output LED is tuned on and all the switch addresses in
the route are sent.
It is important the remember that the LEDs connected the
the outputs are being used as route indicators and not
real switch state indicators. Since only one route is
active at a time then only one LED can be on at a time in
this example. Note that a green and red LED could be
connected to each group output so that green would show
the active route and red show inactive ones. In that case
only one green LED would be on at a time. Any given route
has to include the real switch addresses and the pseudo
addresses. The pseudo addresses are the ones that are
used for controlling the output LEDs. Stated another way,
each route has to send the real switch addresses and the
pseudo switch addresses that will turn off all the other
route active LEDs.
In this example CV1 is programmed with a value of 11.
This sets the group address from 81 to 88 which are the
pseudo addresses. Only the first five groups are used as
there are only five routes. The actual switch addresses
are 33 to 36 as depicted in the yard ladder diagram. A
wiring diagram of buttons and LEDs is also shown.
When the button connected to input group 1 throw (G1t) is
pressed a 81 throw command is issued. Note that the close
inputs are not used. When the SRC8 receives this 81 throw
it turns on group 1 thrown LED and executes route 1.
Route 1 sends switch addresses 33t and 36t and pseudo
addresses 82c though 85c. Any other route LED indicator
has now been turned off. Notice in the spreadsheet below
each route is configured like this with the switch
addresses and the pseudo switch addresses.
A template for the SRC8 CV calculator spreadsheet can be
downloaded from our Support Tools page.
