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Laurel Electronics provides
digital panel meters / controllers, totalizers, counters, loop-powered meters,
temperature meters, for all types of transducers or process indication &
control. |
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Laureate™
RS-232 & RS-485 Options
Isolated two-way point-to-point or multipoint communications
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| RS-232
Interface Board |
RS-485
Interface Board |
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Allows
meter or counter to:
- Output latest value,
peak value and alarm status to a computer, PLC or
remote Laureate display.
- Serve as a remote
display to a computer, PLC or other Laureate.
- Be set up via computer
using PC-compatible application software (furnished).
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Data
rates selectable from 300 to 19,200 bps. |
Powered
by meter or counter. |
Isolated
from meter and power grounds. |
RS-485
version allows up to 31 meters or counters to be multidropped
on same data line. |
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Description |
| Laureate™
DPMs and counters offer RS-232 or RS-485 communication
boards to interface with computers, PLCs or other digital
devices, including the Laureate 6-digit remote display.
Both boards are connected via phone jacks using standard
4- or 6-conductor phone cables. With either board, Laurel
Electronics provides Windows-compatible software which
allows device setup via a computer monitor.
With DPMs and counters, the information transmitted
via RS-232 or RS-485 includes the latest signal value
(filtered or unfiltered), peak signal value, alarm values
and status. By using a serial interface board, a Laureate
counter can be used as a remote display to an external
device or to another Laureate.
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Point-to-Point Communications with RS-232
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| RS-232
Board |
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RS-232 option allows a Laureate meter or counter to
be programmed by a computer, to output data to a computer,
or to drive a panel-mount printer, remote display, or
other digital device with an RS-232 interface. There
can normally only be one meter or counter per RS-232
line. However, multiple remote displays can be connected
to a single RS-232 line in multidrop fashion.
The RS-232 request-to-send line (RTS) can be set to
a latched mode, where a single reading is transmitted
when the line is taken high. This mode allows a single
data transfer to be commanded by a device other than
a computer.
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Multidrop communications
with RS-485
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| RS-485
Board |
| The
RS-485 version allows multiple Laureate meters, counters
and remote displays, as well as non-Laureate devices,
to be connected to the same RS-485 line in parallel,
multidrop fashion. Each device has its own, unique digital
address. It provides for up to 31 digital addresses,
so that multiple Laureates can be addressed and transmit
on the same data line.
Data rates are selectable from 300 to 19,200 bps. In
case of long line lengths, the RS-485 board at the end
of the line can be terminated by a jumper-selectable
120 ohm resistor to minimize signal reflections. A full
duplex mode with separate wire pairs for transmit and
receive is offered by the RS-485 version, as is a half
duplex mode with shared transmit and receive wires.
The use of RS-485 lines maximizes utilization of computer
ports and simplifies plant wiring. As opposed to RS-232,
RS-485 uses two pairs of balanced lines, which allow
long cable runs in electrically-noisy environments.
Transmission distance up to one mile are possible |
| Specifications |
| RS-232
Mode |
Full
duplex
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| RS-485
Modes |
Full
and half duplex
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| Data
Rates
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300,
600, 1200, 2400, 4800, 9600, 19200 bps
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| Signal
Levels
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Compliant
with RS-232 or RS-485 standards
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| Data
format
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No
parity, 8 data bits, 1 stop bit
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| ESD
Protection |
15
kV per IEC 1000-4-2
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| EMI
Immunity
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10
V/m per IEC 1000-4-3
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| EFT
Protection
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2
kV per IEC 1000-4-4
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| Short
Circuit Protection |
Continuous |
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FLW,
Inc - 3505
Cadillac Ave - Bldg E - Costa Mesa, CA. - 92626 - USA - Ph (714) 751 -
7512 - Fax (714) 751 - 0213
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