| If
you are looking for a low-cost alternative to our R85/R810
8-Relay Controller, the R45/R410 may be exactly what you
are looking for. This is a no-frills design offering
simple RS-232 control of 4 Omron relays.
Features include no-click
startup, 4 LED status lights, and an optoisolated RS-232 data
input. Relays can be controlled at a jumper-selectable
data rate of 1200 or 9600 baud. Jumper
selectable RS-232 levels ensure compatibility with ANY
computer or microcontroller capable of delivering RS-232 data.
Even a no-frills design
deserves a high-quality driver stage, and that's exactly what
we put on the R45/R410 controllers. Fast-reacting
flyback diodes help shunt dangerous voltages away from the
driver circuit. We use a quad transistor network to
drive the relays, which is complete overkill by most
engineering standards.
To control the R45/R410,
simply connect a data and ground wire between the R45/R410 and
computer or microcontroller. Provide +12 Volts DC to the
board, and send ASCII character codes 0 to 15. ASCII
character code 0 turns all relays off, code 15 turns all
relays on. Every number in between actuates the relays
in the equivalent binary pattern.
The R45 includes 4 unsealed
OMRON relays, perfect for general purpose relay control.
The R410 uses hermetically sealed relays for longer contact
life and higher switching currents. Use the R410 for
outdoor installations.
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