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OBID
i-scan
®
HF System-Manual
ID
ISC.LR1002
FEIG ELECTRONIC GmbH
Page 22 of 173
H20411-0e-ID-B.docx
4.2. Serial Data Format and Protocol Frames
The Reader ID ISC.LR1002 can be configured by different interfaces and data may be written on
Transponders or read from Transponders. The communication between Reader and connected
host (terminal, PC, etc.) is executed by means of fixed protocols. The used protocol is intended for
data bus use and is equipped with a bus address.
During data transfer via the asynchronous interface the Reader supplies the required data or a
status byte. The reply contains the transmitted control byte.
There is no reply from the Reader if there is a protocol frame failure.
Protocol frame: Standard Protocol-Length (up to 255 Byte)
Protocol frame: Advanced Protocol-Length
Reader
←
Host
1
2
3
4
5
(6...n-2)
STX
(0x02)
MSB
ALENGTH
LSB
ALENGTH
COM-ADR
CONTROL-
BYTE
(DATA)
©
n-1
n
ª
LSB
CRC16
MSB
CRC16
Host
←
Reader
1
2
3
4
5
6
(7...n-2)
STX
(0x02)
MSB
ALENGTH
LSB
ALENGTH
COM-ADR
CONTROL-
BYTE
STATUS (DATA)
©
n-1
n
ª
LSB
CRC16
MSB
CRC16
The Reader supports the advanced protocol frame. If the host application sends a advanced proto-
col frame the Reader will always response with advanced protocol frame.