Specifications

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SRC-8 III Installation and Operation Manual
INSTALLATION
DIP 5 = (ON) Hex mode – When on, hex “Burst” mode is selected. Refer to the
protocol below for hex commands. (OFF) is ASCII mode. Refer to the ASCII pro-
tocol below for ASCII commands.
DIP 6 = (ON) Pair mode, inputs from one SRC-8 III will map directly to outputs of
another SRC-8 III when connected together via RS-232 or RS-422. (OFF) normal
operation via RS-232/422. DIP 5 must also be ON as pair mode only works in hex
mode.
NOTE: When in pair mode, as soon as a communication failure is detected, all
relays will be turned off. As soon as communications is restored, the relays will
be set according to the other unit’s inputs.
DIP 7 = (ON) will cause inputs to generate *uix<cr/lf>, on firmware version 1.16
or higher. Where * is the start character, u is Unit ID 0 – 7, i = Input number 1 – 8,
x = On/Off state, 1 = On, 0 = Off.
DIP 8 = Future feature creep
Pair Mode:
The SRC-8 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 a
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 1-8 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 DIP switches 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 communication is
restored, the LED will cease to flash.
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-8 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 corresponding inputs on
the broadcasting unit.
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