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


NAME

       DS2409 - MicroLAN Coupler


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

       1F


SPECIAL PROPERTIES

   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
       read-only, yes-no
       Is the branch ( 0=main or 1=aux ) currently connected to the master
       bus? Value returned is 1 (yes) or 0 (no). The DS2409 should not allow
       both to be on simultaneously.
       ALL is an aggregate of the properties, comma separated. It is an atomic
       operation.
       BYTE is an aggregate of the branches as a byte, A is bit 0.

   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
       write-only, yes-no
       Writing a non-zero value to this property will electrically reset both
       the main and auxillary 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
       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).  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.

   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
       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
       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, A is bit 0.


STANDARD PROPERTIES

       See the file man3/standard.3so.


ALARMS

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


DESCRIPTION

       See the file man3/description.3so.

   DS2409
       The 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

       See the file man3/addressing.3so.


DATASHEET

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


SEE ALSO

       See the file man3/seealso.3so.


AVAILABILITY

       http://www.owfs.org


AUTHOR

       Paul Alfille (paul.alfille@gmail.com)

OWFS Manpage                         2003                            DS2409(3)

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