Electro-Numerics, Inc.
42213 Sarah Way, Temecula, CA 92590, USA


Tel: 800-854-8530 (USA)
Tel: 951-699-2437 
Fax: 951-695-7246


    Micro Series RS232 & RS485 Options
Isolated two-way point-to-point or multipoint communications


RS-232 Interface Board for Digital Panel Meters & Counters

RS232 Interface Board

RS-485 Interface Board for Digital Panel Meters & Counters

RS485 Interface Board

  • Allows meter or counter to:
    • Output latest value, peak value and alarm status to a computer, PLC or  remote Micro display.
    • Serve as a remote display to a computer, PLC or other Micro.
    • Be set up via computer using PC-compatible application software (furnished).
  • Data rates selectable from 300 to 19,200 bps.
  • Powered by meter or counter.
  • Isolated from meter and power grounds.
  • RS485 version allows up to 31 meters or counters to be multidropped on same data line.


Micro™ DPMs and counters offer RS232 or RS485 communication boards to interface with computers, PLCs or other digital devices, including the Micro 6-digit remote display. Both boards are connected via phone jacks using standard 4- or 6-conductor phone cables. With either board, Electro-Numerics provides Windows-compatible software which allows device setup via a computer monitor.

With DPMs and counters, the information transmitted via RS232 or RS485 includes the latest signal value (filtered or unfiltered), peak signal value, alarm values and status. By using a serial interface board, a Micro counter can be used as a remote display to an external device or to another Micro.

Point-to-point communications from a digital panel meter to a computer with RS-232

Point-to-Point Communications with RS232

RS-233 interface for digital panel meters and counters

RS232 Board

The RS232 option allows a Micro 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 RS232 interface. There can normally only be one meter or counter per RS232 line. However, multiple remote displays can be connected to a single RS232 line in multidrop fashion.

The RS232 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.

Multidrop communications between digital panel metes and counters and a computer using multidrop RS-485

Multidrop communications with RS485


RS485 Board

The RS485 version allows multiple Micro meters, counters and remote displays, as well as non-Micro devices, to be connected to the same RS485 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 RS485 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 RS485 version, as is a half duplex mode with shared transmit and receive wires.

The use of RS485 lines maximizes utilization of computer ports and simplifies plant wiring. As opposed to RS232, RS485 uses two pairs of balanced lines, which allow long cable runs in electrically-noisy environments. Transmission distance up to one mile are possible.


RS232 Mode
RS485 Modes
Data Rates
Signal Levels
Data format
ESD Protection
EMI Immunity
EFT Protection
Short Circuit Protection

Full duplex
Full and half duplex
300, 600, 1200, 2400, 4800, 9600, 19200 bps
Compliant with RS232 or RS485 standards
No parity, 8 data bits, 1 stop bit
15 kV per IEC 1000-4-2
10 V/m per IEC 1000-4-3
2 kV per IEC 1000-4-4

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Electro-Numerics, Inc., 42213 Sarah Way, Temecula, CA 92590, USA
Tel: 800-854-8530 (USA), 951-699-2437;  Fax: 951-695-7246;  sales@electronumerics.com