Auxiliary Line High Impedance; Figure 3: The Linkusb Reporting The Current Input Level Is 1 - iButtonLink LINK 12 User Manual

Auxiliary Line High Impedance

Command " & " (ampersand)
Command Compatible With:
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.
N : The Link supports the standard RJ-11/RJ-45 type 1-Wire® bus connection, where the
OTE
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.
N : The Link USB supports the standard RJ-45 type 1-Wire® bus connection, where the
OTE
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.

Figure 3: The LinkUSB reporting the current input level is 1

For the LinkHub-S, the LinkHub-E, and the LinkOEM, the load on the Aux line should be
limited to less than 20 mA.
S C
IMILAR OMMANDS
• " d " – Auxiliary Line High Power and Low Impedance
• " z " – Auxiliary Line Low Power and Impedance
• " " " – Auxiliary Output Isolation Mode
1
:
The LINK™ Family Manual
Version 1.6 ©iButtonLink, LLC 2016
Link | LinkHub-S | LinkHub-E | LinkOEM |
Page 15