Siemens SIMATIC Ident RF200 User Manual

Introduction
1.1 Properties of the protocol
ASCII protocol for RF200
6 Operating Manual, 11/2016, C79000-G8976-C329-04
1.1
Properties of the protocol
This protocol represents a simple communications procedure for a point-to-point connection.
The communications parameters of the serial interface are set as follows in the factory:
● Data frame with 8 data bits
1)
● 1 stop bit
1)
● Odd parity
● Transmission speed: 19.2 kBd
1)
This value cannot be changed in RF200 readers.
Full duplex data transfer is possible. Since no handshake is defined, both stations can send
at the same time.
The net data is transferred with the ASCII characters '0' to '9' and 'A' to 'F'. Other characters
are not permitted. For the frame, two uniquely recognizable control characters are used,
"STX [02]" for the start of the frame and "ETX [03]" for the end of the frame.
With the ASCII protocol, a third optional control character "LF [0A] = new line" (before ETX)
is possible. The reader understands this control character, configuration on the reader is
unnecessary. A frame is uniquely identified by the control characters for the start and end,
the procedure has no other reliability mechanisms or length information. The amount of data
to be transferred is restricted by the monitoring time and by the length byte in the frame.
Receipt of the frame is monitored with a monitoring time of 300 ms. If the host does not
manage to send the next character to the reader within this time until "ETX" is reached, the
frame is ignored.
Note
Restrictions resulting from the ASCII protocol
The ASCII protocol has no data consistency mechanisms. You should take this into account
in your application (e.g. checksum).
The ASCII protocol has no line monitoring mechanisms. Execute the "SLG
-STATUS"
command (mode 0) at regular intervals, to ensure th
at the reader is reachable.
Table 1- 1 Structure of a LAUF protocol frame
STX
Net data
{optional: LF}
ETX
0x02 ASCII values (two bytes for 1
net byte)
{0x0A} 0x03
Table 1- 2 ASCII table with the corresponding hexadecimal values
ASCII
value
'0' '1' '2' '3' '4' '5' '6' '7' '8' '9' 'A' 'B' 'C' 'D' 'E' 'F'
Hex
value
30 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46

Siemens SIMATIC Ident RF200 Specifications

General

Brand	Siemens
Model	SIMATIC Ident RF200
Category	Rfid Systems
Language	English