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4
SRC-8 III Installation and Operation Manual
DESCRIPTION
PRODUCT DESCRIPTION
The Broadcast Tools® SRC-8 III is a computer interface to the real world.
Connection through an RS-232, RS-422 or RS-485 serial port the SRC-8 III can
notify your PC software program that any of 8 optically isolated inputs has been
opened or closed and allows your software to control eight SPDT, 1-amp relays.
Communication with the SRC-8 III can be accomplished via short “burst” type
ASCII or binary commands from your PC (computer mode). Also, two units can be
operated in a standalone mode (master/slave mode) to form a "Relay extension
cord," with 8-channles of control in each direction. The unit can communicate using
RS-232, RS-422 or RS-485 at data rates up to 38400. The SRC-8 III may be
expanded to 32 inputs x 32 outputs. Optional external Ethernet and USB capabili-
ties may be added.
The SRC-8 III is supplied with LED indicators to display input and relay status.
Three front panel LED’s display power, serial transmit and receive data. Removable
screw terminals are provided for ease of wire installation/removal.
Set-up:
Connect the supplied 9Vac power supply. The default baud rate setting is 9600, 8,
N, 1. The baud rate can be set to 2400, 4800, 9600 or 38400. This can be done using
either the ASCII or binary command formats listed below. Inputs can be simple con-
tact closures or completely optically isolated with your external trigger sourcing cur-
rent to the opto-isolators. See appendix for details on jumper settings to configure
the inputs. The RS-232 serial connection is made to the male DB-9 connector. JP07
is used to reverse the RS-232 transmit and receive pins on the DB-9. Factory set-
ting is the “NN” position (Pin 5 = Ground, Pin 2 = Transmit and pin 3 = Receive).
RS422/485 operation via the removable screw terminals on the rear of the unit.
FRONT PANEL DESCRIPTION
The front panel is equipped with eight red led’s for each relay and eight green led’s
for each input. The green “Power” LED will light when the SRC-8 III has power
connected.
