70
Glossary
WAGO-I/O-SYSTEM 750
750-921
Bluetooth
®
Adapter
Manual
Version 2.0.1, applicable from FW Version 02
M
MAC ID
(
M
edia
A
ccess
C
ontrol
Id
entification)
A device MAC ID is its hardware address.
Bluetooth
®
MAC IDs enable
worldwide, unique identification of a specific
Bluetooth
®
radio adapter.
P
Parity
A parity bit is a simple check bit in a data word. The parity check is employed to
detect erroneously transmitted data words. Here, a data word refers to a sequence
of bits. “Parity” denotes the number of bits assigned as 1 in the data word, and is
designated “even” when the number of bits is even; otherwise “odd.”
PIN
(
P
ersonal
I
dentification
N
umber)
The PIN is used to authenticate
Bluetooth
®
devices with one another, acting as the
basis for encryption.
PLC
(
P
rogrammable
L
ogic
C
ontroller)
A PLC is a device used to control a machine or system and is programmed on a
digital basis, such as a WAGO fieldbus controller.
R
RS-232
The RS-232 (official designation ANSI/EIA/TIA-232-F-1997) is a serial interface
for point-to-point connections. “RS” stands for “Radio Sector,” but is frequently
translated as “Recommended Standard.”
Data is transmitted via this interface bit-serial over a data line and received on a
different data line. As only one data line is used at a time, the data is transmitted
time-delayed consecutively and asynchronously. The time intervals between
transmission of the data may be randomly long.
As the RS-232 interface is a so-called powered interface, data is transferred
electrically encoded.
The cable connections used for this interface are 9-pin Sub-D connectors and 9-
pin jacks. A distinction is made here between data lines (RxD, TxD and GND)
and control lines (DCD, DTR, DSR, RTS, CTS and RI).
RTS
(
R
equest
T
o
S
end)
Data line for an RS-232 interface which makes a “send request”: a high level at
this output signals that data are waiting to be sent.