DS2409(3) One-Wire File System DS2409(3)

# [NAME](#NAME)

**DS2409** - MicroLAN Coupler

# [SYNOPSIS](#SYNOPSIS)

1-wire network branch controller.

**1F** \[.]XXXXXXXXXXXX\[XX]\[/\[ **aux** | **branch.\[0|1|ALL|BYTE]** | **control** | **discharge** | **event.\[0|1|ALL|BYTE]** | **clearevent** | **main** | **sensed.\[0|1|ALL|BYTE]** |

See the file man3/standard\_mini.3so.

]]

# [FAMILY CODE](#FAMILY_CODE)

*1F*

# [SPECIAL PROPERTIES](#SPECIAL_PROPERTIES)

## [aux](#aux)

*directory*  
This is the *aux* branch of the *DS2409* network branch. It is implicitly accessed (via the *aux smart-on* command) when it is listed or devices on this branch are addressed.

## [branch.0 branch.1 branch.ALL branch.BYTE](#branch.0_branch.1_branch.ALL_branch.BYTE)

*read-write, yes-no*  
Writing a value of *1* to the branch properties explicitly selects the meant branch ( *0=main* or *1=aux* ). Writing *0* deselects the branch. This is an addition to the directory branch selection scheme available by simply accessing the *main* and *aux* directories. Both ways to select a branch coexist nicely but the latest scheme used wins. Attempting to select both branches, either by setting both bits at the same time or subsequently, fails. Clearing both branch selection bits, either by clearing both bits at the same time or subsequently, resets the event flags inside the *DS2409* as a side effect. Reading the branch properties returns which branch (if any) is connected to the master bus.

**After using the directory branch selection scheme, both branches are deselected automatically.**

*ALL* is an aggregate of the properties, comma separated. It is an atomic operation.  
*BYTE* is an aggregate of the branches as a byte, *main* is bit 0. It is an atomic operation.

## [control](#control)

*read-write, unsigned integer*  
Setting of the PIO *control* pin. There are 4 possible settings:

**0**

Unconditionally off (non-conducting)

**1**

Unconditionally on (conducting)

**2**

Auto on when *main* branch switched in

**3**

Auto on when *aux* branch switched in

## [discharge](#discharge)

*write-only, yes-no*  
Writing a non-zero value to this property will electrically reset both the main and auxiliary branches of the 1-wire bus by dropping power for 100 milliseconds. All devices on those branches will lose parasitic power and reset to power-up defaults. As a side effect, both *event* flags and thus, the alarm state, are cleared, too.

## [event.0 event.1 event.ALL event.BYTE](#event.0_event.1_event.ALL_event.BYTE)

*read-only, yes-no*  
Has the *event* flag for the branch been triggered? A negative edge on the disconnected branch ( *0=main* or *1=aux* ) sets the flag. This is achieved by e.g. connecting an iButton to the branch. Value returned is 1 (yes) or 0 (no).

After accessing the *main* or *aux* directory, both branches are deselected automatically and thus, the event flags and alarm state are cleared.

*ALL* is an aggregate of the properties, comma separated. It is an atomic operation.  
*BYTE* is an aggregate of the branches as a byte, *main* is bit 0. It is an atomic operation.

## [clearevent](#clearevent)

*write-only, yes-no*  
Writing a non-zero value to this property will reset both *event* flags and thus, clear the alarm state, too.

## [main](#main)

*directory*  
This is the *main* branch of the *DS2409* network branch. It is implicitly accessed (via the *main smart-on* command) when it is listed or devices on this branch are addressed.

## [sensed.0 sensed.1 sensed.ALL sensed.BYTE](#sensed.0_sensed.1_sensed.ALL_sensed.BYTE)

*read-only, yes-no*  
Voltage sensed at the *0=main* or *1=aux* branch pin. Valid only when the branch is switched out. Value returned is 0 (low) or 1 (high).

*ALL* is an aggregate of the properties, comma separated. It is an atomic operation.  
*BYTE* is an aggregate of the branches as a byte, *main* is bit 0. It is an atomic operation.

# [STANDARD PROPERTIES](#STANDARD_PROPERTIES)

See the file man3/standard.3so.

# [ALARMS](#ALARMS)

The *DS2409* will respond to a conditional search if the *main* event flag is set.

# [DESCRIPTION](#DESCRIPTION)

See the file man3/description.3so.

## [DS2409](#DS2409)

The [**DS2409 (3)**](/man/os/owfs/DS2409.3) allows complex 1-wire network topology. Each branch has it's power preserved, even when isolated from the master. A separate PIO pin can be configured to show branch switching, or controlled explicitly.

# [ADDRESSING](#ADDRESSING)

See the file man3/addressing.3so.

# [DATASHEET](#DATASHEET)

http://pdfserv.maxim-ic.com/en/ds/DS2409.pdf

# [SEE ALSO](#SEE_ALSO)

See the file man3/seealso.3so.

# [AVAILABILITY](#AVAILABILITY)

http://www.owfs.org

# [AUTHOR](#AUTHOR)

Paul Alfille (paul.alfille@gmail.com)

2003 OWFS Manpage

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Document: DS2409(3) from owfs 3.2.4-r9 (Chainguard OS)
Source: https://github.com/owfs/owfs