Overview 2
BTC284U is a low-cost multifunctional
programmable controller. Its universal
input accepts the most common RTDs,
thermocouples, and linear signals.
The device can be equipped with up
to 2 relay outputs, which can control
various actuators using ON/OFF
control algorithm, and an optional
RS485 interface enables networking.
BTC284U allows adjusting of the built-in
digital filters and the programmable
output delay, resulting in increased
operation reliability in case
of industrial interferences.
Input Setting
♦Open the case.
♦Follow the diagrams on the left
to find the configuration jumpers
J1 and J2, located on the main
board (cases 'B', 'H', 'V', 'L', 'R1'
and 'R1') or on the outer side
of the right board
(cases 'Q' and 'S').
♦To set input 0...10 V,
short out J2.
♦To set any of the other possible
input types, short out J1.
Waste Disposal 15
Do not dispose of
electronic devices
together with
household waste
material!
If disposed of within European Union,
this product should be treated
and recycled in accordance with the laws
of your jurisdiction implementing
Directive 2012/19/EU on waste electrical
and electronic equipment (WEEE).
Communication Protocol 14
Notes:
♦BTC284U adds 3 spaces
in the beginning of the response.
♦BTC284U returns decimal point
even when the value is integer.
♦#13 (CR) is byte 0x0D;
#10 (LF) is byte 0x0A.
♦The U255 command should be used
only in case just one slave is presented.
Protocol examples:
PC or other device: BTC284U response:
activating device number 10
U10#13#10 ok.#13#10
reading filter time
f.t#13#10 f.t 0015.#13#10
writing filter time of 30
f.t 30#13#10 f.t 0030.#13#10
reading input value of 27.5
p.v#13#10 p.v 027.5#13#10
invalid command.
command not recognized
parity error. parity error detected
not a number. attempt to write symbols
for numerical parameter
point error. value resolution greater
than parameter’s one
out of range. value out of range
unit is busy. writing is allowed only
to device at Basic level
read only. parameter is read-only
can't save. problem with writing
in non-volatile memory
♦The device remains active
until it receives another Uх
command, but with different
device address, a FAiL
error, or with reset.
♦Any Baud Rate value change
through the communication
interface also deactivates
the device.
Reading from a device
♦If the frame consists of only
one word, it is recognized
as a command for reading.
♦The device responds to it by
returning the same word and
its value, according to Table 2.
Writing in a device
♦If the frame consists of
two words, it is recognized
as a command for writing.
♦With writing, transferred
are the same two words
that would have been
received at the respective
command for reading
from the device.
♦After successful writing,
the device responds with
the respective command
for reading, except for
the baud command.
Other device responses
♦When Error Info value is -1,
the device substitutes any
command for error reading.
♦BTC284U responses in case
of incorrect protocol use
are given on the left.
Reset
To reset the device,
send command reset.
Mounting 3
Panel mounting ('B' / 'H' / 'V' / 'Q' / 'S' / 'L')
♦Place BTC284U into an appropriate panel cut-out.
♦Tighten it into place using
the enclosed mounting bracket(s).
Rail mounting ('R1')
♦Insert the upper rail edge into the upper
plastic groove of the rail-installing mechanism
on the back side of the unit.
♦Press the unit towards the lower
rail edge until the moving part
of the installing mechanism clicks.
Rail mounting ('R2')
The device can be easily mounted on every
35 mm rail conforming to EN50022 by the means
of a standard UNDECAL socket base.
Electro-Magnetic Interference (EMI) Issues
Important note:
A built-in RC noise
suppression circuit is
connected in parallel
with relay contacts.
Full AC voltage
isolation is NOT
provided when relay
contacts are open.
Small AC current
(≈1.5 mA at 230 VAC)
still flows through
the RC circuit!
♦All signal wires must be shielded. They must
not be packaged together with power cables!
♦Never lay the signal wires close to inductive or
capacitive noise sources, such as relays,
contactors, motors, etc.!
♦All shields have to be grounded ONLY at one end,
as closer as possible to the controller terminals!
♦Avoid sharing supply lines with powerful
consumers, especially with inductive loads,
switched on and off.
♦To stop unwelcome interference signals
entering through the power supply lines,
use shielded 1:1 isolation transformer!
♦Shunt all switched (not only those switched
by the controller) inductive consumers with
special suppression networks: RC group and
varistor - for AC loads, or diode - for DC loads.
♦If the controller operates in a very powerful
EMI area, it has to be mounted inside
a grounded metal shielding box!
♦To protect the interface from electro-magnetic
disturbances, follow the RS485 standard
guidelines.
'B' / 'H' / 'V'
'R1'
'L'
'S'
'R2'
'Q'
