WAGO I/O-SYSTEM 750 Manual page 218

218 • Glossary
H
HCI
®
The "Host Controller Interface" (HCI) is an interface in the Bluetooth pro-
tocol suite through which higher layers can directly act on the baseband pro-
tocol.
Header
Information prepended to the user data portion of a data packet that is used,
for example, to administer a network or initialize a device.
Hexadecimal
In a hexadecimal numbering system, the numbers are represented in a base
16 place value system.
Host controller
Host controllers are microcontrollers with different software statuses that
can be queried.
I
Inquiry
®
An "Inquiry" (request/information), in Bluetooth technology, is a process in
®
which Bluetooth devices within range are sought.
Internal data bus
With WAGO, an internal data bus is the internal bus of the WAGO-I/O-
SYSTEM 750/753.
ISM
ISM bands ("Industrial, Scientific, and Medical Band") are frequency bands
that can be used license-free with the observation of certain criteria. In addi-
®
tion to Bluetooth , other wide-spread wireless technologies such as WLAN
use the ISM band at 2.45 GHz according to IEEE 802.11.
WAGO-I/O-SYSTEM 750
I/O Modules