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AVR Electronics Private Limited

Ganga Nagar, Bengaluru, Karnataka

| GST  29AABCA6723A1Z3

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Line Extenders

Our product range includes a wide range of LD232: RS232 Serial Line Extender, QuidoDuplex ETH: Extender of Digital I/Os, Ethernet, SW485 - Splitter / Extender of RS485 and QuidoDuplex RS: Extender of Digital I/Os, RS485.

LD232: RS232 Serial Line Extender
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LD232 (long distance RS232) is a set for extending RS232 line, maximum working distance 1200m, surge supression, galvanic isolation.

A pair of modules  LD232A and LD232B extends RS232 line to a maximum distance of 1200m. Both modules have galvanic isolation and surge supression against any interference on the extending line.

RS232 is connected from PC to the LD232A module via straight cable. All signals are then converted and isolated, then transmitted to the remote module LD232B, where those signals are converted back to RS232. Each signal si transmitted through a pair of wires by means of RS422 line. This line is very rugged and impervious to most electromagnetic interference.

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QuidoDuplex ETH: Extender of Digital I/Os, Ethernet
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QuidoDuplex ETH is a set of two I/O modules for Ethernet (LAN, computer network) with a special firmware designed specificaly to transmit digital I/Os over Ethernet as an autonomous system - no PCs or PLCs needed. If one input is turned on, the corresponding output on the other unit is also turned on. Bi-directional.

I/O module features

  • Digital two state signals are transmitted from one to the other and also the other way via Ethernet (or Internet).
  • Uses Local Area Network (LAN) or Internet to transmit data, no need to place new cabling and the distance is virtually unlimited.
  • Wide power voltage range: 8(12) to 30 V DC.
  • Set consists of two I/O modules Quido ETH 4/4 (or 8/8) with special firmware.
  • (power supply units not included, sold separately)

Usage

  • Transmission of control states over greater distances (status indication).
  • Easy remote controll - bi-directional transmission can be used for control and monitoring.
  • Transmitting digital I/Os over Internet

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  • SW485 - Splitter / Extender of RS485
  • SW485 - Splitter / Extender of RS485
  • SW485 - Splitter / Extender of RS485
  • SW485 - Splitter / Extender of RS485
SW485 - Splitter / Extender of RS485
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A device for the interconnection of RS485 terminal blocks (bus bars). SW485 enables up to nine RS485 terminal blocks to be connected in a star topology. All the lines are equal. When data are received by any line, they are sent to all the other lines.

What is it good for?

 

  • Enables RS485s to be connected in a star topology.
  • Proper interconnection of several devices communicating over RS485.
  • Interconnection of RS485 networks.
  • Signal edge enhancement for larger distances. 

Features of the RS485 splitter

  • A device for proper interconnection of up to nine RS485 lines (enables a star topology, which is not usually allowed for RS485).
  • Logical processing of all signals.
  • Signal transmission with minimum delay - only 130 ns.
  • Maximum communication speed of RS485 lines: 1.5 Mbps
  • Possibility to configure the switching delay for automatic change of data flow direction (7 µs to 1.9 ms in several increments)
  • User-configurable connection of terminating resistors and bias resistors defining the idle state of the line. These resistors may be connected separately for each individual line.
  • Mountable to a wall or DIN 35 mm rail.
  • Supply voltage 7 to 30 V DC.

How does the RS485 splitter work?

 

Figure 1: Block diagram of SW485 and connection of several devices (example)

Data from individual lines are only processed by logical circuits. Data received by any of the lines are sent to all the other lines. Individual lines have no buffer for data receipt.

When data arrive almost simultaneously to two lines, the system receives the data whose beginning was first registered. The other lines switch to "Transmission" and start to transmit the data. After the data receipt has been completed the system waits for a configured period of time (a so called "Switching Delay"). After this period has elapsed, all the lines switch to "Receipt" and wait for data to come.

 

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QuidoDuplex RS: Extender of Digital I/Os, RS485
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QuidoDuplex RS is a set of two I/O modules for RS485 line (two wires only) with a special firmware designed specificaly to transmit digital I/Os over RS485 line as an autonomous system - no PCs or PLCs needed. If one input is turned on, the corresponding output on the other unit is also turned on. Bi-directional.

Bi-directional I/O module features

  • Digital two state signals are transmitted from one to the other and also the other way via RS232 or RS485.
  • Maximum workung distance 1200 meters when using RS485 line (more with repeaters)
  • Wide power voltage range: 8(12) to 30 V DC.
  • Set consists of two I/O modules Quido RS 4/4 (or 8/8) with special firmware.
  • (power supply units not included, sold separately)

Usage

  • Transmission of control states over greater distances (status indication).
  • Easy remote controll - bi-directional transmission can be used for control and monitoring.

Example of bi-directional I/Os over RS485 line.

 

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AVR Electronics Private LimitedUnit II, 15, 7th Cross, 5th Main, Near CBI Office, Ganga Nagar, Bengaluru-560032, Karnataka, India

Vijay S. Hubli (Director)

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