Sabre 1555 RFID & Bar Code Reader Programmer’s Reference Manual
4-8
Table 4-6 <CMD/RESP> <[PARM/DATA]> Frame Component
FRAME_MANAGEMENT (FM)
FM includes a field named <More> that is used to indicate that the message is not
finished (another frame is being sent or the message consists of more than one frame).
FM also includes a bit field named ACCRequest that is used to request a high-level
acknowledgment from the receiver of the frame. The ACCRequest field can be
configured in the product, for BFR frames only, by a setup command (Table 4-7).
Value
Size
Description
[0 - 0xFF]
[0 - n] bytes
Depending on the frame type, <CMD/RESP>
<[PARM/DATA]> can be one of the following:
•
setup commands
•
response codes
•
command parameters for setup commands
•
command parameters for IMCs
•
data
Table 4-7 FM Component
<FM> byte
<More>
Size
Description
b7, b6
2 bits
Used to indicate if more than one frame is expected
Value = 0: the message is encoded in a single frame
Value = 1: the frame is not the last frame in a multiframe message
Value = 2: the frame is the last frame of a multiframe message
Note:
High-level frame acknowledgment is only possible when all of the
frames in the message have been transmitted (<More> is set to 0 or 2).
b5
1 bit
Always set to 0
b4 - b3
2 bits
Reserved
<AccRequest>
Size
Description
b2
1 bit
Encoded in bit 2 of FM
Value = 0: no high-level frame acknowledgment required
Value = 1: high-level frame acknowledgment is required from the receiver of
the frame (only for ACC and NAC). This does not affect other responses.
Note:
The ACCRequest bit will always be set to 0 in the high-level frame
acknowledgment.
<RestartFlag>
Size
Description
Содержание Sabre 1555
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