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SRC-2X Installation and Operation Manual
DESCRIPTION
PRODUCT DESCRIPTION
The tiny TOOLS SRC-2X interfaces two optically isolated inputs and two SPST
relays to an Ethernet port. The SRC-2X can notify a users PC software program that
any of two optically isolated inputs have been opened or closed and allows the users
software to control two SPST, 1-amp relays. Communication with the SRC-2X is
accomplished via short "burst" type ASCII commands from the users PC. The user
may also add up to 64 ASCII strings per input and 16 user-defined strings per relay,
while two units may be operated in a standalone mode (master/slave mode) to form
a "Relay extension cord," with two channels of control in each direction. The unit
communicates using an Ethernet connection. The SRC-2X is powered by a surge
protected internal power supply. The SRC-2X may be rack mounted on the option-
al RA-1 mounting shelf.
INSTALLATION
Please examine your SRC-2X carefully for any damage that may have been sus-
tained during shipping. If any is noted, please notify the shipper immediately and
retain the packaging for inspection by the shipper. The package contains the SRC-
2X, 7.5 VDC @ 1 amp wall power transformer, CAT5 cable and this manual.
Installation of the SRC-2X in high RF environments should be performed with care.
Shielded cable is suggested for all I/O connections. All shields and the station
ground should be connected to the ground screw on either of the inputs terminals. It
is recommended that all cables connected to the SRC-2X be looped through ferrite
cores to suppress RF. Surge protection with RF filtering such as the Tripp-Lite ISO-
BAR 4 or 6” is also suggested for the wall transformer.
Rack mounting: The SRC-2X may be rack mounted using the optional RA-1, 1-RU
rack shelf. Apply a short strip of user-supplied Velcro to the bottom of the SRC-2X
and attach the other mating strip to the surface of the RA-1.
Inputs connections: Two optically isolated inputs. Connect your equipment to the
plug-in euroblock screw terminals labeled IN1 and/or IN2 and GND. Contact clo-
sures, TTLlogic and/or open collectors may be used to activate each input. To inter-
nally power the optically isolated inputs, leave JP1 in the “LOC” position. To power
externally, move JP1 to the “EXT” position and connect any positive DC voltage
from 5 to 24 VDC to the “EXT+” terminal and the groundside of the power supply
to the GND terminal. The red “DATA” led blinks when either input changes state.
Relay connections: Two SPSTrelays with Normally Open dry contacts. Make your
connections to the desired relay. K1NO & K1COM and/or K2NO & K2COM. The
two yellow led’s indicate which relay is active.
The SRC-2X is factory programmed for an internal voltage source for the optically
isolated inputs. The baud rate should be left at 9600,8,N, 1 and the operating mode
is set for PC control. The Dipswitches are used for baud rate and mode selection.
To select the desired baud rate and mode, refer to the Dipswitch descriptions on
pages 4 and 4. When your SRC-2X is reconfigured, reinstall the cover, screws, reat-
tach all connections and apply power to the unit. Verify that the green “PWR” led
is lit.
NOTE:
To make jumper or
Dipswitch changes, all
connections should be
removed from the SRC-
2X, along with the four
screws on the bottom of
the enclosure. Remove
the cover to expose the
circuit assembly,
jumper and the
Dipswitch.
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