The programming track is not required once this address and option 3 have been set.
TIP: If the “Smart” program button is pressed when power is turned on, option 3 is enable
until power is removed. Useful if you do not want to have ops mode enabled all the time.
4.11 Input Lockout Address
CV14 - Address, value 0 to 255: CV15 - Address adder, value 0 to 9
These CVs set the input lockout address. When a switch (turnout) throw command is issued
that matches this address the SRC16 inputs are disabled. When a close command is issued
with this address the inputs are enabled. This feature is useful for dispatcher control when
the SRC16 inputs are used for local turnout control.
5 Connections
5.1
Power
The SRC16 is powered by using the two terminal connector labeled “Track Power or 9-12
VDC”. See diagram on front page. Power can be from the track (accessory decoder opera-
tion) or a
filtered DC voltage (9 to 12 VDC) power supply.
Most analog 'Power Packs' will
not work because they do not provide smooth (filtered) DC power.
The SRC16 power con-
nector is non polarized and either terminal can be connected to plus or minus of t
he DC
power supply. The power supply should be isolated from the system ground. That is, not
connected to ground (booster ground, house wiring ground, etc). When multiple SRC16s
are used they can be all connected to one power supply. The power supply must be able to
supply the current for all the SRC16s.
The plus and minus of the power supply must be
connected to the same power input terminal on each SRC16. The rail sync terminals can be
used to connect power to other SRC16s when using an accessory bus. See section 5.5. Do
NOT use the rail sync terminals in a standard Digitrax system if the SRC16s are connected
to the main LocoNet bus. See Team Digital website for more information on using an acces-
sory bus.
5.2
Input Interface
Each input is at 5 volts when no device is connect. This is a hi or true state. When the input
is connected to ground by a push button switch or block sensor the state is low or false.
5.3
Output Drive
The output supplies about 5 volts to drive LEDs and other low current devices such as low
current stall type switch machines. The SRC16 has been tested with a Tortoise
TM
switch
machine which can be used for a switch machine drive.
If LEDs are used current limiting resistors are required and should not less the 470 ohms.
This is a general guide line for a typical LED. The current limit for any single output is 20
mA and the total of any connector group of eight outputs is 50 mA.
Warning: The output driver is rated for a maximum of 5 volts. Do not change the posi-
tion of the shoring bar from the factory setting unless MotoDs are being used.
See sec-
tion 5.4.
5.4
10 PIN Input and Output
Input and output connectors have the same pin definitions. Connections can be made using
our terminal strip adapter (TSA) or our Connector Cable Kit. You can build your own by
7
10
4.5 Status Report
CV10 - Status report.
This CV determines which input and output states the SRC16 provides. This is typically
used when the serial bus is enabled. Options 3 and 4 will not work correctly if the outputs
are not configured as responding to switch commands and in groups of close/throw.
Option 1 - Input state messages are sent on the serial bus at power on. This options is typi-
cally used for inputs that are used for block detection. This does NOT apply to inputs that
are used for switch (turnout) control.
Option 2 - Output state messages are sent on the serial bus at power on. Eight messages are
sent based on output groups unless option 5 enabled. These are switch type messages.
Option 3 - Input state messages are sent on the serial bus when a Digitrax interrogation
command is received.
Option 4 - Output state messages are sent on the serial bus when a Digitrax interrogation
command is received. These are feedback type messages.
System
DCC
Control
Option 6
Gate-
Way*
Option 4
Serial
Bus
Option 5
CV
Value
Notes
All DCC Com-
patible Systems
Enabled
0
The SRC16 is controlled via the track
(DCC commands).
The bus is not used by the SRC16.
Digitrax System
Disabled
Enabled
48
The SRC16 is controlled via Loconet.
Digitrax System
Enabled
Enabled
Enabled
24
Provides a separate Loconet bus for
Loconet accessory devices.
Allows devices to receive turnout com-
mands from the track (DCC commands).
Reduces throttle bus traffic.
Easier trouble shooting.
NCE System and
others
Enabled
Enabled
Enabled
24
Provides separate bus for bus enabled
accessory devices.
Allows devices to receive turnout com-
mands from the track (DCC commands)
The following table will help you determine how to configuring the SRC16. If there are
more than one SRC16 or other Gateway capable devices, only one should have the gateway
enabled. In a Digitrax system DO NOT connect the SRC16 to the throttle Loconet if the
gateway, DCC control and serial bus are enabled. This could cause an endless sending of
switch commands from the track to Loconet and back to the track.
Decoder Configuration CV
Value
Select
No options
0
Option 1 - Memory enabled
1
Select
Option 2 - Default output state enabled
2
One
Option 3 - Ops mode programming enabled
4
Option 4 - DCC to bus gateway enabled
8
Option 5 - Serial Bus communication enabled
16
Option 6 - Control from DCC
DISABLED
32
Option 7 - Output lockout enabled
64
Option 8 - Common cathode LEDs
128
Program this value into the configuration CV
To calculate the value of CV9, add up the selected values. Example: Option 1 and option 3 -
CV9 = 1 + 4 = 5
