iButtonLink LINK 12 User manual

The LINK™ Family Manual
Version 1.6 ©iButtonLink, LLC 2016 Page 2

The LINK™ Family Manual
Version 1.6 Page 3
Table of Contents
Table of Contents............................................................................................................................ 3
List of Figures................................................................................................................................. 5
List of Tables .................................................................................................................................. 6
Introduction..................................................................................................................................... 7
Copyright Notices........................................................................................................................... 7
Contact Information........................................................................................................................ 7
Extended Mode Slaves.................................................................................................................... 8
General......................................................................................................................................... 8
Extended Mode vs. Normal Mode............................................................................................... 8
DS2480B/9097U Emulation......................................................................................................... 10
Calibration.............................................................................................................................. 10
Overdrive Speed..................................................................................................................... 10
Flex Timing Modes................................................................................................................ 10
EPROM Programming........................................................................................................... 10
Device Version....................................................................................................................... 10
Important Information for the LinkOEM, the LinkHub-E, and the LinkHub-S........................... 11
LinkOEM................................................................................................................................... 11
LinkHub-S ................................................................................................................................. 11
LinkHub-E................................................................................................................................. 11
ASCII Control Functions.............................................................................................................. 12
General....................................................................................................................................... 12
Case Sensitivity and Symbols.................................................................................................... 12
Active Channel Mask ................................................................................................................ 13
Arrival/Departure Scanning....................................................................................................... 14
Auxiliary Line High Impedance................................................................................................ 15
Auxiliary Line High Power & Low Impedance ........................................................................ 16
Auxiliary Line Low Power & Impedance ................................................................................. 17
Auxiliary Output Isolation Mode .............................................................................................. 18
Bit Mode.................................................................................................................................... 19
Bit Mode with Strong Pull-Up................................................................................................... 20
Byte Mode ................................................................................................................................. 21

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Byte Mode Subcommands ..................................................................................................... 22
Byte Mode with Strong Pull-Up................................................................................................ 23
Channel Reporting On-Off........................................................................................................ 24
Display....................................................................................................................................... 25
Display Serial Number .............................................................................................................. 26
Family First Search.................................................................................................................... 27
First............................................................................................................................................ 28
Help for \ (backslash) Commands............................................................................................. 29
Level Test .................................................................................................................................. 30
LinkLocator Reporting Armed.................................................................................................. 31
LinkLocator Reporting Disarmed.............................................................................................. 31
List of Available Commands..................................................................................................... 32
Low Level.................................................................................................................................. 33
Next ........................................................................................................................................... 34
Pass-Thru Mode......................................................................................................................... 35
RAM & Register States Dump (LinkHub-E)............................................................................ 36
RAM & Register States Dump (LinkHub-S) ............................................................................ 37
Read EEPROM ASCII Data...................................................................................................... 38
Read EEPROM Hex Data.......................................................................................................... 39
Relax Timing............................................................................................................................. 40
Report Active Channel Mask .................................................................................................... 41
Report EEPROM Read/Write Address...................................................................................... 42
Report Maximum Internal EEPROM Address.......................................................................... 43
Report Scan List ........................................................................................................................ 44
Search Type............................................................................................................................... 45
Set EEPROM Read/Write Address ........................................................................................... 46
Sniffer Mode.............................................................................................................................. 47
Status of Bus & Bus Reset......................................................................................................... 48
Turn Off Dynamic Pull-Up........................................................................................................ 49
Write EEPROM ASCII Data..................................................................................................... 50
Write EEPROM Hex Data......................................................................................................... 51
19,200 Baud Serial Port Data Rate............................................................................................ 52
38,400 Baud Serial Port Data Rate............................................................................................ 53
57,600 Baud Serial Port Data Rate............................................................................................ 54

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115,200 Baud Serial Port Data Rate.......................................................................................... 55
APPENDIX A: Power Issues and Requirements ............................................................................. 56
APPENDIX B: 1-Wire® Communications Examples..................................................................... 57
APPENDIX C: LED Indicator ......................................................................................................... 58
Appendix C: Wiring Diagram for Link 12/Link 12i..................................................................... 59
APPENDIX D: Link 12/Link 12i Wiring Diagram.......................................................................... 59
APPENDIX E: Link 45/Link 45i Wiring Diagram .......................................................................... 60
APPENDIX F: LinkUSB Wiring Diagram ...................................................................................... 61
APPENDIX G: LinkHub-S External Wiring Diagram..................................................................... 62
Power Supply............................................................................................................................. 62
Serial.......................................................................................................................................... 63
APPENDIX H: LinkHub-S Wiring Diagram................................................................................... 64
APPENDIX I: LinkHub-E Wiring Diagram .................................................................................... 65
Power Supply......................................................................................................................... 65
Ethernet...................................................................................................................................... 65
1-Wire Ports............................................................................................................................... 66
APPENDIX J: LinkOEM Pin Outs .................................................................................................. 67
APPENDIX K: FxB Protocol........................................................................................................... 68
APPENDIX L: USING 1-WIRE®VIEWER WITH A LINKUSB ............................................................ 69
Using 1-Wire® Viewer with Other Link Devices..................................................................... 70
Index of Commands by Device..................................................................................................... 71
Glossary of Terms......................................................................................................................... 73
Revision History........................................................................................................................... 77
List of Figures
Figure 1: Command " $ " showing the arrival of a T-Sense and a T-Probe on a LinkUSB......... 14
Figure 2: Command " $ " showing the departure of a T-Sense and a T-Probe on a LinkUSB .... 14
Figure 3: The LinkUSB reporting the current input level is 1...................................................... 15
Figure 4: Isolation Mode Extending 1-Wire® Port on LINK Device .......................................... 18
Figure 5: LinkHub-S displaying its firmware version (1.11) ....................................................... 25
Figure 6: LinkHub-E displaying its firmware version (1.11)....................................................... 25
Figure 7: LinkOEM displaying its ID string (LinkOEM) and version number (V1.7) ................ 25
Figure 8: LinkUSB displaying its ID string (LinkUSB) and version number (V1.7)................... 25

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Figure 9: A LinkHub-S showing that the search was mismatched, indicated by the " ? " in front
of each string of serial numbers.................................................................................................... 27
Figure 10: Command " f " displaying that there is another device found, indicated by "+" ........ 28
Figure 11: Command "f" showing that there is another device found after the first search,
indicated by the “ + ”. Then, command “n” is used in ordert to bring up the next device found.
After this device, there are no other devices on the bus, indicated by the “ – “. ......................... 28
Figure 12: Command " l " returning a "1" to indicate that the level of the bus is high............. 30
Figure 13: Command "\L" showing that there is not a LinkLocator associated with the 1-Wire®
address........................................................................................................................................... 31
Figure 14: The first line shows that that bus was previously at level 1. Next, command “ x “ is
used, which shows that the bus is now at a low level................................................................... 33
Figure 15: Command “ f” indicating that there are more devices on the bus, shown with the “ + ”.
Then, command " n " is entered, displaying that there are no more devices found after the
second device, indicated by "-"..................................................................................................... 34
Figure 16: A LinkHub-S returning a two-character hex value of 37 to indicate that there is
activity on the channel mask......................................................................................................... 41
Figure 17: Command " \m " returning "0001FF<CR> ," meaning that the next byte to be
read/written is " 0001FF " hex..................................................................................................... 42
Figure 18: The first two lines show the results of arrivals being scanned with command " $ ".
The next line is a line break, which was caused by command " * ". Following the line break are
the results of command “ * ”, which are the serial numbers of the T-Probe................................ 44
Figure 19: Command " \M000100\wThis is a test<CR> " writes 15 characters to EEPROM
beginning with address " 000100 ". The next EEPROM read/write address would be " 00010F ".
....................................................................................................................................................... 50
Figure 20: Standard EIA/TIA 568 B RJ-45 pins .......................................................................... 59
Figure 21: Standard EIA/TIA 568 A RJ-45 Colors...................................................................... 60
Figure 22: Standard EIA/TIA 568 B RJ-45 Colors ...................................................................... 61
Figure 23: Standard EIA/TIA 568 B RJ-45 Colors ...................................................................... 62
Figure 24: LinkHub-E +12 V DC Power Supply Connector........................................................ 62
Figure 25: Standard EIA/TIA 563 A RJ-45 Colors...................................................................... 64
Figure 26: LinkHub-E Connections.............................................................................................. 65
Figure 27: LinkHub-E +12 V DC Power Supply Connector........................................................ 65
Figure 28: Standard EIA/TIA 563A RJ-45 Colors....................................................................... 66
Figure 29: LinkOEM Pin Outs...................................................................................................... 67
List of Tables
Table 1: Table of extended mode commands ................................................................................. 8
Table 2: Extended mode status byte definitions............................................................................. 9
Table 3: Table showing the bit patterns used to activate the different channels .......................... 13
Table 4: Expanded commands for the Link and LinkUSB........................................................... 29
Table 5: Expanded commands for the LinkHub-S and LinkHub-E ............................................. 29
Table 6: Table showing single character commands.................................................................... 32
Table 7: DC barrel specifications ................................................................................................. 56

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Version 1.6 ©iButtonLink, LLC 2016 Page 7
Introduction
The LINK™ devices are advanced and intelligent interfaces to be used with Maxim Integrated 1-
Wire® and iButton® components. Each uses superior digital and analog methods to accomplish
more reliable operations on a wide variety of network topologies. They simplify network
communications and offer some diagnostic tools as well.
The LINK™ devices operate reliably on long and short 1-Wire® busses. This is accomplished by
a special analog interface design that uses matched impedances and slew rate controls, as well as
smart cable pre-charge. In addition, the firmware is adaptive and automatically makes
adjustments for a variety of 1-Wire® network parameters.
The LINK™ devices were designed in cooperation with Maxim Integrated. Maxim Integrated is
the originator and manufacturer of the 1-Wire® and iButton® devices as well as various
accessories. Some terms used in this document may be trademarks of Maxim Integrated and are
used with their permission. Application note 244 from the Maxim-Dallas website describes the
improvements implemented by the LINKTM devices in greater detail.
Copyright Notices
© Copyright iButtonLink, LLC 2002, 2003, 2005, 2016. All rights are reserved. This document
may not, in any form, be reproduced or transmitted without the prior consent from iButtonLink.
iButton® and 1-Wire® are registered trademarks of Maxim Integrated, San Jose, CA USA
The LINKTM and LinkLocatorTM are trademarks of iButtonLink, Whitewater, WI USA
FxBTM is a licensed trademark of Alicit Engineering, San Antonio, TX USA
Alicit currently has a patent pending on the FxBTM protocol.
Contact Information
iButtonLink
Phone: [phone]
1221 Innovation Drive STE 117
Fax: [phone]
Whitewater, WI 53190
Email: [e-mail]
Website URL: www.iButtonLink.com

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Version 1.6 ©iButtonLink, LLC 2016 Page 8
Extended Mode Slaves
General
Extended mode slaves are slaves based on a microprocessor instead of a 1-Wire® part from
Maxim-Dallas. They exist on the same bus with Maxim-Dallas 1-Wire® parts but do NOT
participate in normal mode communications. When the host selects extended mode, the Maxim-
Dallas parts disappear from the bus and the extended mode slave appears.
Extended mode is not available on the LinkOEM or the LinkHub.
Extended Mode vs. Normal Mode
Extended mode is a proprietary extension to the 1-Wire® protocol by iButtonLink. LINKTM
devices use ASCII commands to select which kind of slave is active on the bus.
Entering extended mode takes advantage of the fact that family code 0x00 is invalid. If Maxim-
Dallas ever deploys a normal mode part for family code 0x00, that part can NEVER be mixed
with extended mode slaves.
Extended mode is very similar to normal mode with several important differences:
•Extended mode slaves only respond to command sequences that begin with an extended
mode reset (<Reset120>).
•Extended mode slaves do NOT emit a presence pulse. Instead, an extended mode slave
will return a Status byte after a <Reset120>; bit 0, which is the same as the presence bit
in normal mode.
When entering extended mode from normal mode, the LINKTM devices issue the command
sequence found below in Table 1 to exit normal mode. Table 2 shows the status byte definition
for extended mode.
Command
Description
<Reset480>
Normal mode reset
0x55
Match rom
0x00
Family code (not valid for Maxim-Dallas parts)
Table 1: Table of extended mode commands

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Bit
Result
Definition
Bit 0
Clear
Extended mode slave is present
Bit 1
Clear
Extended mode slave is capable of resume
Bit 2
Clear
Extended mode slave is in alarm
Bit 3
Undefined (Reserved)
Reserved
Bit 4
Undefined (Reserved)
Reserved
Bit 5
Undefined (Reserved)
Reserved
Bit 6
Undefined (Reserved)
Reserved
Bit 7
Undefined (Reserved)
Reserved
There is no support for extended mode slaves using the 9097U emulation command set.
Serial numbers of normal mode slaves are allocated and managed by Maxim-Dallas. The serial
numbers of extended mode slaves are allocated and managed by iButtonLink, LLC
DISCLAIMER:
iButtonLink will only support extended mode slaves manufactured by iButtonLink. Extended
mode is a proprietary extension of the 1-Wire® protocol by iButtonLink. Agreements between
iButtonLink and Maxim-Dallas to protect their intellectual property do not extend to other
manufacturers.
Table 2: Extended mode status byte definitions

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Version 1.6 ©iButtonLink, LLC 2016 Page 10
DS2480B/9097U Emulation
The DS2480B is the basis for the Maxim DS9097U series of 1-Wire® adaptors. The LINK™
devices are programmed to closely emulate Maxim DS2480B/9097U serial port interfaces. This
allows existing software to be used without modification. It also allows the LINK™ devices to
be used in place of the Maxim DS2480B/9097U when increased performance or reliability is
required.
The DS2480B/9097U functions that are not emulated by the LINKTM devices are described
below:
Calibration
Unlike the DS2480B/9097U, LINKTM devices do not require calibration from the serial
port. This is due to the LINKTM devices’ crystal-controlled time bases, meaning that drift
in the interface data rate and waveform timing is not an issue. The LINKTM devices will
ignore the expected calibration byte for DS2480B/9097U.
Overdrive Speed
While the LINKTM devices do not support overdrive speed bus communication, this is not
an issue for most applications. Higher speed mode cannot be supported because the
analog components in the bus interfaces are carefully tuned for optimum long-line and
short-line performance at standard speed.
Flex Timing Modes
The LINKTM devices use 1-Wire® waveform timing that is carefully and dynamically
controlled by intelligent control algorithms. Changes to flex timing mode that could be
done in the DS2480B/9097U are unnecessary and are not supported in the LINKTM
devices. However, the LINKTM devices will emulate the flex mode registers and will
appear to behave like the DS2480B/9097U for software compatibility.
EPROM Programming
The LINKTM devices do not support +12V pulses for programming EPROM 1-Wire® or
iButton® devices. However, programming pulses for 5 V devices (EEPROM) are
supported.
Device Version
When queried using the normal DS2480B/9097U method, the LINKTM devices report
“device version 7”. This allows the software to distinguish the LINKTM from a standard
Maxim DS2480B/9097U interface, which returns a “3”. Since single-port LINKTM
devices also return “device version 7”, the user can use the “ ” (space) ASCII command
to determine if a LinkHub is present.

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Important Information for the LinkOEM, the
LinkHub-E, and the LinkHub-S
LinkOEM
•LinkOEM will function with 5V TTL signals only.
LinkHub-S
•Each LinkHub-S contains a DS2401 serial number chip on the internal 1-Wire® bus. The
serial number chip will show up on 1-Wire® searches unless the internal bus is
deactivated.
•The LinkHub-S is a powered device providing +12 V and +5 V power on the same cable
as the 1-Wire® bus. In addition, local EEPROM storage is provided for user
configuration data.
•There are five 1-Wire® busses (one internal and four external) that are logically or’ed
into a single composite 1-Wire® bus. Software written for the Maxim Integrated
DS2480B/9097U interface will work even though the 1-Wire® devices are physically on
separate busses. Each external bus on the LinkHub-S can be up to 1,000 feet long, while
external busses on the Link, LinkOEM, and LinkUSB can be up to 3,000 feet long. This
yields a logical 1-Wire® network of 4,000 feet with four times the network weight of a
standard 1-Wire® bus.
LinkHub-E
•Each LinkHub-E contains a DS2401 serial number chip on the internal 1-Wire® bus,
providing a unique identity. The serial number will appear on 1-Wire® searches unless
the internal bus is deactivated. It may be used to identify a particular LinkHub-E or to
verify that the 1-Wire® bus reading functions are working correctly.
•The LinkHub-E provides +12 V and +5 V power on the 1-Wire® bus cables.
•There are five 1-Wire® busses (one internal and four external) that are logically or’ed
into a single composite 1-Wire® bus. Software written for the Maxim Integrated
DS2480B/9097U interface will work even though the 1-Wire® devices are physically on
separate busses. Each external bus on the LinkHub can be up to 1,000 feet long, while
external busses on the Link, LinkOEM, and LinkUSB can be up to 3,000 feet long. This
yields a logical 1-Wire® network of 4,000 feet with four times the network weight of a
standard 1-Wire® bus.

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ASCII Control Functions
General
In addition to the DS2480B/9097U emulation, The LINKTM devices also provide many 1-Wire®
bus functions in response to ASCII commands. This allows the LINKTM devices to be used with
any terminal program or serial port communications API to perform iButton®, 1-Wire® or, in
some cases, extended mode bus functions without software drivers, making it easy to use. The
LINK™ device functions that can be performed have been coded for normal ASCII keys so that
all the basic 1-Wire® functions can be performed manually on the keyboard of a terminal
program or using programming languages that are limited to ASCII serial port I/O. As a rule,
these special commands consist of every command code that is not used in the DS2480B/9097U
emulation.
Case Sensitivity and Symbols
ASCII commands are case sensitive. Make sure to be aware of the case that the command
requires.
Please also be aware of the difference between a single quotation mark, also known as an
apostrophe, ( ‘ ) and an accent mark ( ` ). In some cases, an apostrophe may prompt a command,
but it will not be the same as the command an accent mark prompts.

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Active Channel Mask
Command “ \C ” (backslash + uppercase C)
Command Compatible With: LinkHub-S | LinkHub-E
This command sets the active channel mask for certain LINKTM devices. The channel mask will
“mask” any number of the ports on the master so that they do not communicate with the
connected slaves, allowing for communication with specific slaves. This command is followed
by a two-digit hexadecimal value representing a bit mask for channels that should be active.
There are five 1-Wire® busses. The bit patterns are listed in the table below.
A “ 1 ” makes the channel active, meaning that the master will report the slaves connected to the
ports. A “ 0 ” makes the channel inactive, meaning that the ports will be “masked,” and those
ports will not be read.
Bit Pattern
Command Input
(Syntax)
Channel Activated
0x37
/C37
All busses enabled
0x01
/C01
External bus 1
0x02
/C02
External bus 2
0x04
/C04
External bus 3
0x10
/C10
External bus 4
0x20
/C20
Internal bus
SIMILAR COMMANDS:
•“ \$ ” – Channel Reporting On/Off
•“ \c ” – Report Active Channel Mask
Table 3: Table showing the bit patterns used to activate the different channels

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Arrival/Departure Scanning
Command “ $ ” (dollar sign)
Command Compatible With: Link | LinkHub-S | LinkHub-E | LinkOEM |
LinkUSB
This command starts the arrival/departure scanning for some LINKTM devices. Figure 1 below
shows an arrival on a LinkUSB. Scanning is terminated by a Reset, First, Next, or a number of
other operations.
NOTE: A bus scanning function is included in many LINK products to scan and report the arrival
or departure of a new 1-Wire® device on a 1-Wire® bus. When turned ON using the “ $ ”
command, the scanning system continually performs “First” and “Next” device discovery
operations. It will build a table of device serial numbers, reporting up to eight (for LinkHub-S
and LinkHub-E) or 10 (for Link, LinkOEM, and LinkUSB) devices. The arrival will be reported
as a string with an exclamation point (!), a comma (,), and then the arriving device’s serial
number. The departure will be reported as a question mark (?), followed by a comma (,), and
then the serial number of the device departed from the bus. This will make sure that the device is
actually gone by doing multiple reads.
On The LinkHub-E and LinkUSB,the current contents of the table can be reported with a “ * ”
(asterisk) command while scanning is active.
NOTE: The scanning system will not work properly if more than eight (for LinkHub-S and
LinkHub-E) or 10 (for Link, LinkOEM, and LinkUSB) 1-Wire® or iButton® devices are present
on the bus. Exceeding these numbers will exhaust the Link’s memory capacity.
! , 8000000202214928
! , 9A00000208AC5528
? , 8000000202214928
? , 9A00000208AC5528
Figure 1: Command " $ " showing the arrival of a
T
-Sense and a T-Probe on a LinkUSB
Figure 2: Command " $ " showing the departure of
a T
-Sense and a T-Probe on a LinkUSB

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Auxiliary Line High Impedance
Command “ & ” (ampersand)
Command Compatible With: Link | LinkHub-S | LinkHub-E | LinkOEM |
LinkUSB
For the Link, the LinkOEM, and the LinkUSB, this command sets the auxiliary line to an
input and reports the current input level.
For the LinkHub-S and the LinkHub-E, this command reports the current state of the switch
+5V line on the output connectors.
NOTE: The Link supports the standard RJ-11/RJ-45 type 1-Wire® bus connection, where the
two center contacts of the RJ connector are the data and ground connections to the 1-Wire® bus.
An auxiliary pin in the RJ connector can be added and used as an output to supply a low level (0
V) or a high level (5 V). It can also be an input, sensing a 0 - 5 V logic level. This extra I/O
defaults to input (Hi-Z) mode.
NOTE: The Link USB supports the standard RJ-45 type 1-Wire® bus connection, where the
center two contacts of the RJ connector are the data and ground connections to the 1-Wire® bus.
An auxiliary pin in the RJ connector can be added and used. By default, this line is driven to the
HIGH impedance state and left unpowered. It can be an output to supply a low level (0 V) or a
high level (5 V). It can also be used as an input, sensing a 0 - 5 VDC logic level. When set to the
5 V level using the “d” command, this line can provide power for 1-Wire® devices. The current
available is limited to approximately 75mA.
For the LinkHub-S, the LinkHub-E, and the LinkOEM, the load on the Aux line should be
limited to less than 20 mA.
SIMILAR COMMANDS:
•“ d ” – Auxiliary Line High Power and Low Impedance
•“ z ” – Auxiliary Line Low Power and Impedance
•“ “ ” – Auxiliary Output Isolation Mode
1
Figure 3: The LinkUSB reporting the current input level is 1

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Version 1.6 ©iButtonLink, LLC 2016 Page 16
Auxiliary Line High Power & Low Impedance
Command “ d ” (lowercase D)
Command Compatible With: Link | LinkHub-S | LinkHub-E | LinkOEM |
LinkUSB
For the Link, the LinkOEM, and the LinkUSB, this command sets the auxiliary line to HIGH
level (default) output.
For the LinkHub-S and the LinkHub-E, this command turns on the switched +5V line to the
output connectors.
The Link supports the standard RJ-11/RJ-45 type 1-Wire® bus connection, where the two center
contacts of the RJ connector are the data and ground connections to the 1-Wire® bus. An
Auxiliary pin in the RJ connector can be added and used as an output to supply a low level (0 V)
or a high level (5 V). It can also be an input, sensing a 0 - 5 V logic level. This extra I/O defaults
to input (Hi-Z) mode.
The Link USB supports the standard RJ-45 type 1-Wire® bus connection where the center two
contacts of the RJ connector are the data and ground connections to the 1-Wire® bus. An
Auxiliary pin in the RJ connector can be added and used. By default, this line is driven to the
HIGH impedance state and left unpowered. It can be an output to supply a low level (0 V) or a
high level (5 V). It can also be used as an input, sensing a 0 - 5 V logic level. When set to the 5 V
level using the “d” command, this line can provide power for 1-Wire® devices. The current
available is limited to approximately 75mA.
NOTE: For the LinkHub-S, the LinkHub-E, and the LinkOEM, the load on the Aux line
should be limited to less than 20 mA
SIMILAR COMMANDS:
•“ & ” – Auxiliary Line High Impedance
•“ z ” – Auxiliary Line Low Power and Impedance
•“ “ ” – Auxiliary Output Isolation Mode
.

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Version 1.6 ©iButtonLink, LLC 2016 Page 17
Auxiliary Line Low Power & Impedance
Command “ z ” (lowercase Z)
Command Compatible With: Link | LinkHub-S | LinkHub-E | LinkOEM |
LinkUSB
For The Link, The LinkOEM, and The LinkUSB, this command takes the auxiliary line to a
LOW level and LOW impedance.
For The LinkHub-S and The LinkHub-E, this command turns off the switched +5 V line to
the output connectors.
For the LinkHub-S, the LinkHub-E, and the LinkOEM, the load on the auxiliary line should
be limited to less than 20 mA.
The Link supports the standard RJ-11/RJ-45 type 1-Wire® bus connection, where the two center
contacts of the RJ connector are the data and ground connections to the 1-Wire® bus. An
auxiliary pin in the RJ connector can be added and used as an output to supply a low level (0 V)
or a high level (5 V). It can also be an input, sensing a 0 - 5 V logic level. This extra I/O defaults
to input (Hi-Z) mode.
The Link USB supports the standard RJ-45 type 1-Wire® bus connection where the center two
contacts of the RJ connector are the data and ground connections to the 1-Wire® bus. An
Auxiliary pin in the RJ connector can be added and used. By default, this line is driven to the
HIGH impedance state and left unpowered. It can be an output to supply a low level (0 V) or a
high level (5 V). It can also be used as an input, sensing a 0 - 5 V logic level. When set to the 5 V
level using the “d” command, this line can provide power for \1-Wire® devices. The current
available is limited to approximately 75 mA.
SIMILAR COMMANDS:
•“ d ” – Auxiliary Line High Power and Low Impedance
•“ & ” – Auxiliary Line High Impedance
•“ “ ” – Auxiliary Output Isolation Mode

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Auxiliary Output Isolation Mode
Command “ “ ” (quotation)
Command Compatible With: Link | LinkOEM | LinkUSB
On LINKTM devices, this command will cause the auxiliary output to enter isolation mode and
become an image of the 1-Wire® bus transmitter drive waveform. This signal can be useful
when trying to accomplish an isolated 1-Wire® connection or whenever a 2-Wire connection is
preferred. The original 1-Wire® bus remains unaffected. Figure 4 shows how isolation mode
runs on a 1-Wire® device.
Setting the auxiliary output level using the “ z ” or “ d ” commands will turn this feature off, as
will any reset of the device.
When in the isolation mode, the LINKTM devices output the 1-Wire® driving waveform on the
aux pin. This can be used to extend the 1-Wire® bus using other signaling protocols. It can also
be used to isolate the bus using optical or galvanic isolation devices. The following diagram
shows how isolation mode could be used to extend the 1-Wire® port on the LINKTM devices.
The LINKTM devices also have a mode where the timing of the 1-Wire® waveforms is slowed to
accommodate the longer turn-around times of extended host connections like that shown above.
In normal mode, network lengths of up to 3,000 feet can be used (depending on the medium). In
extended mode, network lengths of between 2,000 and 6,000 feet can be achieved.
SIMILAR COMMANDS:
•“ & ” - Auxiliary Line High Impedance
•“ d ” – Auxiliary Line High Power and Low Impedance
•“ z ” – Auxiliary Line Low Power and Impedance
The LINK
Open Drain
Open Drain
1-Wire Devices
Aux
O/W
Figure 4: Isolation Mode Extending 1-Wire® Port on LINK Device

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Version 1.6 ©iButtonLink, LLC 2016 Page 19
Bit Mode Command “ j ” (lowercase J)
Command Compatible With: Link | LinkHub-S | LinkHub-E | LinkOEM |
LinkUSB
This command places the LINK device into bit mode. Only single ASCII digits of “ 0 ” or “ 1 ”
value are allowed and single ASCII digits are returned.
Hitting ENTER (carriage return) will end bit mode.
SIMILAR COMMANDS
•“ ~ ” - Bit Mode with Strong Pull-Up
•“ b ” – Byte Mode
•“ p ” – Byte Mode with Strong Pull-Up

The LINK™ Family Manual
Version 1.6 ©iButtonLink, LLC 2016 Page 20
Bit Mode with Strong Pull-Up
Command “ ~ ” (tilde)
Command Compatible With: Link | LinkHub-S | LinkHub-E | LinkOEM |
LinkUSB
This command places the LINKTM device into byte mode. Power (strong pull-up) is applied to
the bus after the last bit of the first byte is issued. Only single ASCII digits of “ 0 ” or “ 1 ” value
are allowed and single ASCII digits are returned.
Hitting the ENTER (carriage return) will end bit mode.
NOTE:Subsequent bytes will be performed but will not be followed by strong pull-up.
SIMILAR COMMANDS:
•“ j ” – Bit Mode
•“ b ” – Byte Mode
•“ p ” – Byte Mode with Strong Pull-Up
•“ . ” – Turn Off Dynamic Pull-Up