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Difference between revisions of "MOD-RS485-ISO"

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Register map starts at address 20h. There are 8 memory registers, that the user can access:
 
Register map starts at address 20h. There are 8 memory registers, that the user can access:
  
−
* '''DeviceID (20h)''' - Hard-coded to '''25h'''.
+
{| class="wikitable" style="text-align: center;"
−
* '''Firmware (21h)''' - Indicate firmware revision, latest version is '''03h'''.
+
!colspan="4"|Device registers
−
* '''Address  (22h)''' - Writing to this register will change slave address of the device.
 
−
Default is
 
−
* '''Mode    (23h)''' - Indi
 
−
 
 
−
 
 
−
 
 
−
{| class="wikitable"
 
−
|+Food complements
 
 
|-
 
|-
−
|Orange
+
!Name
−
|Apple
+
!Address
 +
!Default
 +
!Description
 
|-
 
|-
−
|Bread
+
|DeviceID
−
|Pie
+
|20h
 +
|25h
 +
|Device identifier
 
|-
 
|-
−
|Butter
+
|Firmware
−
|Ice cream
+
|21h
−
|}
+
|x
 +
|Indicate firmware revision, latest version is 03h
 +
|-
 +
|Address
 +
|22h
 +
|22h
 +
|Writing to this register will change slave address of the device.
 +
|-
 +
|Mode
 +
|23h
 +
|00h
 +
|Set device either in pass or bridge mode
 +
|-
 +
|Control
 +
|24h
 +
|03h
 +
|Enable/Disable RX/TX channel
 +
|-
 +
|Baudrate
 +
|25h
 +
|12h
 +
|Set default baudrate. Usable only in bridge mode.
 +
|-
 +
|TX FiFo
 +
|26h
 +
|x
 +
|
  
 
=== Modes of operation ===
 
=== Modes of operation ===

Revision as of 00:02, 27 April 2017

Description

MOD-RS485-ISO is smart RS485 transceiver. Data flow can be controlled via I2C bus.

Leds

The device has two leds:

  • Green - Indicates TX channel is active
  • Red - Indicates RX channel is active

By default both channels are active, so both leds should be on.

Registers

Register map starts at address 20h. There are 8 memory registers, that the user can access:

Device registers
Name Address Default Description
DeviceID 20h 25h Device identifier
Firmware 21h x Indicate firmware revision, latest version is 03h
Address 22h 22h Writing to this register will change slave address of the device.
Mode 23h 00h Set device either in pass or bridge mode
Control 24h 03h Enable/Disable RX/TX channel
Baudrate 25h 12h Set default baudrate. Usable only in bridge mode.
TX FiFo 26h x

Modes of operation

The device has 2 modes of operation:

  • Pass - What comes in that comes out, no mater modulation, baudrate, etc. This is the default mode of operation.
  • Bridge - TX and RX pins are disconnected and all communication is done by the I2C bus. Writing byte to tx register will send it to RS485 bus. The baudrate is set to 115200.


Additionally you can disable data that goes from/to RS-485 bus. This can be done only by sending I2C message to the board. By default both directions are enabled.

Documents

Under construction

Hardware

Under construction

Software

Under construction

Older Firmware releases

Latest firmware is available at the main page of the device. In the wiki one can only find older firmware, that still might be helpful. The projects listed below are no longer officially supported. The best practice is to use the EXACT same compiler as mentioned and in most cases the exact same IDE version as mentioned.

Older firmware and examples based on older firmware, released by Olimex for MOD-RS485-ISO:

1) MOD-RS485-ISO v2 firmware - binary, source, and how-to - click to download

2)MOD-RS485-ISO v1 firmware - binary, source, and how-to - click to download

3)MOD-RS485-ISO v1 firmware + OLIMEXINO-328 - C source and HEX for I2C control - click to download

4)MOD-RS485-ISO v1 firmware + PIC-P26J50 demo code - C source and HEX for I2C control - click to download

Projects

Under construction

FAQ

Under construction

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