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7
SRC-16 Installation and Operation Manual
INSTALLATION
Pair Mode
The SRC-16 can be used to transmit the outputs from one unit to another over a seri-
al connection. The logical sense of the inputs is inverted when written to the out-
puts of its corresponding unit. Normally inputs are high and when closed, go to
logic 0 when in pair mode. When logic 0 is received, it will write logic 1 to the out-
put. This allows the relay outputs 01-16 to come on if its corresponding input is
closed. Multiple units can also be set up to communicate with the same number of
units on the other end of a data link. All units must have DIPswitches 5 and 6 turned
ON, and the unit addresses must have a corresponding unit on the other end of the
link set to the same address. For example, if you have two units on each side set to
address 0 and 2, then the two units on the other side of the data link must also be set
to 0 and 2. All units will automatically transmit the states of their inputs on power
up, every ten seconds and when any input changes state. If a unit does not receive
an update from its corresponding paired unit for a period of about 20 seconds, it will
begin flashing the red RX LED one second on, one second off. When communica-
tion is restored, the LED will cease to flash.
NOTE: To daisy-chain multiple SRC-16’s, only use the supplied one foot RED
straight-through CAT 5 (daisy-chain) cable to connect multiple SRC-16’s
together.
Pair mode can also be used to broadcast input closures from one unit to many
using a shared data link. The inputs on the transmit SRC-16 will appear on all of
the receive units as long as their address codes match. If only one unit is used at
each site, it must be set to an address of zero. The red RX LED will blink on the
transmit side to indicate it is not getting return data from the remote units. However,
the data being broadcast will still cause the remote relays to follow their correspon-
ding inputs on the broadcasting unit.
Note:
If jumpers JP23 and 24 are on, and the SRC-16 is in pair mode, it will con-
trol its own relays, essentially being a pair with itself. This is an easy way to test the
inputs and outputs of a single unit. Normally JP23 and 24 should not be on, or you
may have unintended consequences of a unit’s relays responding to input closures
generated from the same board.
