Siemens TIM 1531 IRC Operating Instructions Manual page 330

Glossary
A station that has stored data sends a single data frame or, if block transfer was configured,
several data frames in a block.
If the TIM has stored additional data, it indicates this in the response frame. In this case, the
station is then immediately called up again until the stored data has been transferred.
Polling with time slots
The polling with time slots mode is used in a wireless network in which the use of the radio
frequency assigned by the registration authorities must be shared with other users. Each
user typically has 6 seconds per minute to exchange data with its stations. The frequency
must then be released for other operators. During the allocated time slot, this pooling variant
functions like a normal polling system.
Context: SINAUT ST7
Protocol
A protocol is a set of rules for controlled transfer of data. Protocols, for example, specify the
data structure, the structure of data packets and the coding. Protocols can also specify a
control mechanisms and hardware and software requirements.
Requested message
Polled data frames are data frames of a station or node TIM with a special identifier
indicating that they were sent in response to a general request from the master station.
RS-232
RS-232 is a standard for serial (bit-by bit) data transmission with +12 V and -12 V signals.
RS-232 is a Recommended Standard of the Electronic Industries Association. 9-pin and 25-
pin connections with D-sub connectors (subminiature connector with D-shaped surface area)
are normal for the RS-232 interface.
RS-485
RS-485 is a standard for data transmission with 5 V differential signals. The RS-485
interface uses only one pair of wires and is operated in half duplex. The connection is
multipoint-compliant; in other words, up to 32 subscribers can be connected.
RTS
Request to send
Signal in the data flow control
S0 interface
Basic interface of ISDN for connecting end devices
330
Operating Instructions, 02/2018, C79000-G8976-C468-02
TIM 1531 IRC