MicroController Pros Home Page My Account  Cart Contents  Checkout  
  Store » ARM » Boards » FOX Board » Daisy System » DAISY-10 My Account  |  Cart Contents  |  Checkout   
Quick Find
 
Enter keywords to find the product you are looking for in the Quick Find field above

or use
Advanced Search
Categories
Accessory Boards->
8051->
ADI Blackfin
Arduino->
ARM->
  Boards->
    All Boards
    ARM11
    ARM7->
    ARM9->
    Cortex-A
    Cortex-M->
    Header Boards/Modules
    Prototype Boards
    Raspberry Pi
    CAN
    Enclosure
    Ethernet
    FOX Board->
      Daisy System
    HDMI
    IDE interface
    LCD
    Linux pre-loaded
    RS232
    RS422/RS485
    SD/MMC
    UEXT
    USB Device
    USB Host
    VGA
    Wireless
    Add-On Boards
  Books
  JTAG Debuggers->
  Programmers
  Software
  Starter & Evaluation Kits
Atmel AVR->
Cypress PSoC
Freescale->
FTDI->
Locktronics
Microchip PIC->
MIPS
Parallax->
Renesas
Silicon Labs
ST Microelectronics->
Texas Instruments->
Tibbo->
Books->
Displays->
E-Blocks->
EEPROM/EPROM/FLASH
Embedded Ethernet->
Embedded Software->
I/O Modules->
Parts & Components->
Pick & Place Tools
Programmable Logic (PLD)
Prototype PCBs->
Robotics
ROM/Flash Emulators
Test & Measurement->
Tutorial Software
Universal Programmers->
Wireless->
Information
Intro to Embedded Tools
Embedded News Digest
Useful Resources
Shipping & Returns
Warranty & Liability
Privacy Notice
Conditions of Use
Contact Us
Daisy System RS485/RS422 Interface Module, Opto-Isolation Option US$52.00

DAISY-10
Daisy System RS485/RS422 Interface Module, Opto-Isolation Option


DAISY-10 is an RS485 half-duplex or RS422 full-duplex interface module with selectable opto-isolation and configuration via DIP switches. When configured in RS485 mode, up to 32 devies are pluggable on a single bus line.

This board is part of the modular Daisy System that can be controlled by the FOX Board G20 via the DAISY-1 Adapter, or by the Terra Board.

The board uses a Texas Instruments ISO35 transceiver which provides 2500 Vrms of isolation with the on-field bus line.

Refer to the following table to determine which DAISY-1 (Fox) or Terra port you might want to use.

Port Serial device Signals
Fox D1/dev/ttyS2RS422 or RS485
Fox D3/dev/ttyS1RS422 or RS485
Fox D6/dev/ttyS4RS422 or RS485
Fox D8/dev/ttyS3RS422
Terra D10/dev/ttyS4RS422 or RS485
Terra D13/dev/ttyS2RS422 or RS485

Be sure to get a 0.05" pitch 2x5 IDC cable (FC-19818-10P-FF) to make the connection. The cable is not included.

Terminal Block Pinout

The bus line signals are available on a terminal block with 3.81mm pitch.

Pin Signal
GNDGND signal when not isolated; external GND line when isolated
YRS422 TX+ line
ZRS422 TX- line
BRS422 RX- line or RS485 B line
ARS422 RX+ line or RS485 A line
3V33V3 volt output when not isolated; external 3.3V DC line when isolated

DIP Switch Settings

Eight DIP switches allow you to configure your DAISY-10 module. To turn off isolation, you would set switches 1 and 5 to ON. Note: If you want to use isolated mode, you should remove LED D1 (3V3) from the board, due to a design flaw.

Switch Function when ON
1Wires internal 3.3V to screw terminal
2Wires A to Y
3Wires B to Z
4Wires a 120Ω resistor between A and B
5Wires internal GND to the screw terminal
6Wires CPU RTS signal to DE IC driver
7Wires DE to RE# on IC driver
8Wires CPU CTS signal to RE# IC driver

Using DAISY-10 in RS485 mode

RS485, also known as TIA/EIA-485, is a standard defining the electrical characteristics of drivers and receivers for use in balanced digital multipoint systems. This communications standard is common in industrial automation because it can be used effectively over long distances and in electrically noisy environments.

Even though the data are transmitted over a 2-wire twisted pair bus, all RS485 transceivers interpret the voltage levels of the differential signals with respect to a third common voltage. Without this common reference, a set of transceivers may interpret the differential signals incorrectly.

The image below illustrates typical RS485 wiring in non-isolated mode (i.e., DIP switches 1 and 5 ON). For isolated mode, you will have to provide the 3.3V DC (and remove LED D1 from the board). Remember that the last node on the bus must have a 120Ω resistor for termination.

DIP Switch → 1 2 3 4 5 6 7 8
RS485 mode ON ON ON OFF
Isolated OFF OFF
Not isolated ON ON
A & B terminated ON
A & B not terminated OFF
RX disabled on TX ON
RX always enabled OFF

Using DAISY-10 in RS422 mode

In RS422 mode, set all DIP switches to OFF, except maybe 1 & 5 to turn off isolation. The image below illustrates typical RS422 wiring in non-isolated mode (i.e., DIP switches 1 and 5 ON). For isolated mode, you will have to provide the 3.3V DC (and remove LED D1 from the board).

RS485/RS422 Module Examples

These Python code examples run on the Terra Board with this module plugged into D10. You can modify the source code easily to run it on the Fox Board, e.g. change the port to D6.

The examples call the ablib Library.

The Daisy-10 class is a derived class from the pySerial where it is possible to call the serial ports also with the Daisy connectors name like D1, D10, etc instead of /dev/ttyS2, /dev/ttyS4 etc. Refer to the pySerial docs to learn more about its use:

RS485/RS422 Interface Module Resources


Optional Recommended Products for this Item
2x5 (10-pin) 0.05" pitch IDC Connector Flat Ribbon Cable, 20cm+ US$2.60

This product was added to our catalog on Wednesday 05 October, 2011.

Reviews

Customers who purchased this product also bought:
Daisy System Relay Board, SPDT 5V, 10A @ 250V ACDaisy System Relay Board, SPDT 5V, 10A @ 250V ACUS$15.00

Daisy System Main Adapter Board for FOX Board G20Daisy System Main Adapter Board for FOX Board G20US$22.00

Daisy System 8-Button BoardDaisy System 8-Button BoardUS$20.00

Daisy System LED Board, 8 LEDsDaisy System LED Board, 8 LEDsUS$20.00

Daisy System 4-channel Isolated 0-48V Solid State Output SwitchDaisy System 4-channel Isolated 0-48V Solid State Output SwitchUS$68.00

Daisy System GPRS Quad-Band Module, SMA ConnectorDaisy System GPRS Quad-Band Module, SMA ConnectorUS$135.00

Daisy System Prototype Board, 40mm  40mmDaisy System Prototype Board, 40mm 40mmUS$10.00

Daisy System RS232 DTE Serial Interface, TXD/RXD, CTS/RTSDaisy System RS232 DTE Serial Interface, TXD/RXD, CTS/RTSUS$30.00

Shopping Cart more
0 items
What's New? more
Flowcode 7 "Mechatronics Pack" Feature Pack
Flowcode 7 "Mechatronics Pack" Feature Pack
US$42.00
Specials more
Male 5-pin, 3.81mm Terminal Block, right angle, PCB mount
Male 5-pin, 3.81mm Terminal Block, right angle, PCB mount
US$0.60
US$0.49
Tell A Friend
 

Tell someone you know about this product.
Notifications more
NotificationsNotify me of updates to Daisy System RS485/RS422 Interface Module, Opto-Isolation Option
Reviews more
Write ReviewWrite a review on this product!
  Monday 20 November, 2017   List of all our Products

Copyright © 2003-2017 MicroController Pros LLC
Powered by osCommerce