OBID
i-scan
®
UHF
Manual
ID ISC.MU02.02
FEIG ELECTRONIC GmbH
Page 17 of 96
H90701-3e-ID-B
The Reader supports both Protocol frames, standard and advanced protocol frame. The Host ap-
plication can choose which protocol frame is used.
STX:
If the responded protocol of the Reader starts with the STX sign (0x02) the proto-
col includes more than 255 Byte. Then the protocol length is defined by the 2
Byte Parameter ALENGTH.
ALENGTH (n = 8...65535):
Number of protocol bytes including STX, ALENGTH and CRC16
LENGTH (n = 6...255): Standard Protocol-Length (up to 255 Byte)
Number of protocol bytes including LENGTH and CRC16.
COM-ADR:
0..254 address of device in bus mode
NOTE:
The Reader can be addressed via COM-ADR 255 at any time!
CONTROL-BYTE:
Defines the command which the Reader should operate.
STATUS:
Includes the status message or protocol data from or to the Reader.
DATA:
Is an optional data field with variable length. The number of DATA bytes depends
on the command. The data will be sent always as MSB first if the Reader is in the
Host Command Mode.
CRC16:
Cyclic redundancy check of the protocol bytes from 1 to n-2, as specified by
CCITT-CRC16
Polynom:
x
16
+ x
12
+ x
5
+ 1 (0x8408)
Start Value:
0xFFFF
Direction:
Backward
