Asynchronous Interface; Data Format And Protocol Frames - Feig Electronic OBID i-scan ID ISC.PR101 Manual

®
OBID i-scan

2. Asynchronous Interface

2.1. Data Format and Protocol Frames

The Reader ID ISC.MR/PR/PRH101 can be configured by an asynchronous interface and data may be
written on Transponders or read from Transponders. The communication between Reader and con-
nected 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 contain 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)
Host → Reader
1
LENGTH = n COM-ADR
Host ← Reader
1
LENGTH = n COM-ADR
Protocol frame: Advanced Protocol-Length
Reader ← Host
1
STX
(0x02) ALENGTH
Host ← Reader
1
STX
(0x02) ALENGTH
1
see ANNEX D: Index of Status Bytes
FEIG ELECTRONIC GmbH
System-Manual
2 3
CONTROL-
BYTE
2 3
CONTROL-
BYTE
2 3
MSB LSB
COM-ADR
ALENGTH
2 3
MSB LSB
COM-ADR
ALENGTH
Page 16 of 131
4...n-2 n-1
PROTOCOL-
LSB-CRC16
DATA
4 (5...n-2)
(PROTOCOL-
1
STATUS
DATA)
4 5
CONTROL-
BYTE
n-1
MSB
CRC16
4 5
CONTROL-
BYTE
ID ISC.MR/PR/PRH101
n
MSB CRC16
n-1
LSB-CRC16 MSB CRC16
(6...n-2)
(DATA)
n
LSB
CRC16
6 (7...n-2)
STATUS (DATA)
n-1 n
MSB LSB
CRC16 CRC16
H60301-3e-ID-B.doc
n