Datalogic GWY-01-PBS-01, Reference Manual

Page: 63 / 101

PROFIBUS INTERFACE
55
5
(See the Green changes below)
Output Buffer Input Buffer
Byte # Value Byte # Value
00:
81 Output Buffer Control Byte
(OBCB)
7 6 5 4 3 2 1 0
[1] [0] [0] [0] [0] [0] [0] [1]
00
81
Input Buffer Control Byte
(IBCB)
7 6 5 4 3 2 1 0
[1] [0] [0] [0] [0] [0] [0] [1]
01: 00 (Always 0) 01: 00 (Always 0)
02: 0C (Packet length in bytes) 02: 0E (Packet length in bytes)
03:
04:
05:
06:
07:
08:
09:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
..
30: 00
06
AA
07
00
01
03
E8
00
00
00
00
00
00
00
00
00
00
..
00 (CBx Command word length MSB)
(CBx Command word length LSB)
(CBx Command Type)
(CBx Command Opcode)
(CBx Command, byte not used)
(CBx Command “Node ID”)
(CBx Command Timeout MSB)
(CBx Command Timeout LSB)
(CBx Command Not Used)
(CBx Command Not Used)
(CBx Command Not Used)
(CBx Command Not Used) 03:
04:
05:
06:
07:
08:
09:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
..
30: 00
07
FF
FF
00
01
01
01
00
13
22
01
07
00
00
00
00
00
..
00 (CBx Response word length MSB)
(CBx Response word length LSB)
Minimum of 6 words
(CBx Response Type) FF=Error
(CBx Response Opcode) FF=Error
(CBx Response Instance Counter)
(CBx Response “Node ID”)
(CBx Response Timestamp Month)
(CBx Response Timestamp Day)
(CBx Response Timestamp Hour)
(CBx Response Timestamp Minute)
(CBx Response Timestamp Second)
(CBx Response “Data length”)
1 byte (the Error Code)
(CBx Response Data Byte 1)
Error Code 7 = (Tag Not Found)
(CBx Response byte not used)
31: 81 Data Consistency Byte (OBDCB) 31: 81 Data Consistency Byte (IBDCB)
We will assume that the Slave successfully reads the RFID tag.
The Slave writes the response into the Input Buffer, and toggles
Bit 0 of the IBCB & IBDCB
to indicate that the response is ready.
NOTE
If the master has not acknowledged receiving the previous response, the
controller will not be able to place the response in the Input Buffer.