RF300 system planning
4.1 Fundamentals of application planning
SIMATIC RF300
System Manual, Release 04/2006, J31069 D0166-U001-A2-7618
4-13
Time constants K and t
byte
Transmission rate [baud] K [ms] t
byte
[ms]
19200 28 0,85
57600 14 0,38
115200 11 0,28
The values for K and t
byte
include the overall time that is required for communication in static mode. It
is built up from several different times:
• Serial communication between communication module, reader and
• Processing time between reader and transponder and their internal processing time.
The values shown in the table must be used when calculating the maximum quantity of user data in
static mode. They are applicable for both reading and writing in the FRAM area. For writing in the
EEPROM area (max. 20 bytes), the byte time t
Byte
is approx. 11 ms.
Transmission rate [baud] Memory area K [ms] t
byte
[ms]
Independent FRAM 8,5 0,13
Independent
Write
Read
EEPROM
8,5
8,5
12,2
0,13
In dynamic mode, the values for K and t
byte
are independent of the transmission speed. The
communication time only includes the processing time between the reader and the transponder and
the internal system processing time of these components. The communication times between the
communication module and the reader do not have to be taken into account because the command
for reading or writing is already active when the transponder enters the transmission field of the
reader.
The values shown above must be used when calculating the maximum quantity of user data in
dynamic mode. They are applicable for both writing and reading.
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