WAGO I/O-SYSTEM 750 Manual page 210

210 Glossary WAGO-I/O-SYSTEM 750
®
750-644 Bluetooth RF-Transceiver
Real-time
For this I/O module: "Real-Time Communication" mode is one of three operating
modes that the 750-644 I/O module supports. It is especially suited for time-
critical applications.
Reconnection time
The "reconnection time" is the time interval in which a non-connected device
attempts to establish connections to other devices.
Register communication
Via register communication, an acyclic interface to the parameterization and
configuration data of an I/O module with 1 byte of protocol information and 2
bytes of data (64 addressable data sets) is configured. In register communication,
process data is not exchanged and the mailbox is masked.
Remote device
A device that is not connected through a local interface (e.g. fieldbus coupler/
controller), rather the connection is wireless only. The physical distance can range
from centimeters to kilometers.
Return value
A return value is returned after the execution of a function or a confirmed service.
It contains, for example, a performance result.
RSSI
(Received Signal Strength Indication)
The RSSI is an algorithm for determining signal strength between wireless
participants. RSSI values allow, for example, the diagnosis of distances between
wirelessly connected devices that are too small or too large. RSSI values are
measured over a certain time span and can be derived from an existing communi-
cation. They range from 0 to 106.
R&TTE directive
(Radio and Telecommunications Terminal Equipment Directive)
This directive applies to radio equipment and for all devices that can be connected
to public telecommunications networks.
S
Scan
See „Inquiry"
Scatternet
Group of independent and asynchronous piconets that contains at least one
®
Bluetooth device in common.
SDP
(Service Discovery Profile)
The SDP is used for identification of existing profiles.
Manual
Version 2.0.0, valid from FW/HW Version 03/03