GALILEOSKY GLONASS/GPS Satellite v4.0 (0223) User’s manual
GalileoSky Ltd.
Page 29
8.4
Connecting 1Wire sensors
It is possible to connect different sensors working through 1-Wire interface, and they can operate
simultaneously.
8.4.1
Connecting iButton (DS1990, DS1982) identification key
There are several identification key (IK) applications:
driver identification;
trailer turning off identification;
doors opening identification.
In the same way it is possible to connect devices emulating iButton, for example, RFID-codes readers.
The Terminal can support up to 8 identification keys with certain identifiers or two identification keys with
any identifier. When using a micro-SD card up to 1000 IK with certain identifier are supported.
By identification key applying to 1-Wire and GND contacts (Contacts description) the key number is entered
into the memory, the point is recorded and four lower bytes are sent to the server without checksum. By
key disconnection the number turns to zero, the point is recorded and message is sent to the server. Keys
having code less than 100000 are stored in iButton[1] field.
There can be set up to eight key identifiers using iButtons command (section Digital inputs settings) or in
the Configurator on Settings\Digital inputs tab. You should enter the 4 Lower bytes of iButton key number
without checksum, in hexadecimal system.
For example, full hexadecimal key number:
09 00 00 00 91 02 0С 5С, where
09 – type of device (in this case, it is DS1982, for DS1990 is 01),
00 00 00 91 02 0С – unique number,
5С – checksum.
In this case, one should enter 00 91 02 0С.
By identification key applying with one of the certain identifiers, a correspondent bit will be set in iButton
connection status field. You may control it on the Device tab in the Configurator.
When using a micro-SD card, you may edit a list of trusted keys with the help of the AddKey, DelKey
commands (section Digital inputs settings). You can also connect the card to the computer and edit the list
in the Configurator on the Trusted iButton keys tab. In case of connection of one of the enlisted IK, a
correspondent bit will be set in the Device Status field. (Table 3. Explanation of the device status field).
DS18S20
iButton
1-Wire
GND
DS1923
