Siemens SIMATIC RF300 System Manual page 34

RF300 system planning
4.1 Fundamentals of application planning
Time constants K and t
The values for K and t
is built up from several different times:
•
•
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
Transmission rate [baud]
Independent
Independent
Write
Read
In dynamic mode, the values for K and t
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.
34
byte
Transmission rate [baud]
19200
57600
115200
include the overall time that is required for communication in static mode. It
byte
Serial communication between communication module, reader and
Processing time between reader and transponder and their internal processing time.
K [ms]
28
14
11
is approx. 11 ms.
Byte
Memory area
FRAM
EEPROM
are independent of the transmission speed. The
byte
System Manual, 09/2007, J31069 D0166-U001-A5-7618
t [ms]
byte
0,85
0,38
0,28
K [ms] t
byte
8,5 0,13
8,5 12,2
8,5 0,13
[ms]
SIMATIC RF300