DS2409(3) One-Wire File System DS2409(3)NAMEDS2409 - MicroLAN Coupler
SYNOPSIS
1-wire network branch controller.
1F [.]XXXXXXXXXXXX[XX][/[ aux | branch.[0|1|ALL|BYTE] | control | dis‐
charge | event.[0|1|ALL|BYTE] | clearevent | main |
sensed.[0|1|ALL|BYTE] | ]]
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 sepa‐
rated. 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 PROPERTIESALARMS
The DS2409 will respond to a conditional search if the main event flag
is set.
DESCRIPTIONDS2409
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.
ADDRESSINGDATASHEET
http://pdfserv.maxim-ic.com/en/ds/DS2409.pdf
SEE ALSOAVAILABILITY
http://www.owfs.org
AUTHOR
Paul Alfille (paul.alfille@gmail.com)
OWFS Manpage 2003 DS2409(3)
