
DRAGON™ D151
76
SCAN_ENABLE
Description: Permit the reader to scan barcodes
Packet Format
Length
Opcode
Message Source
Status
Data Checksum
0X04
0XE9
0X04
Field Descriptions
Field Name
Format
Size
Description
Length
Length of message (not
including checksum).
1 Byte
Length Field
Opcode
0XE9
1 Byte
Identifies this opcode type.
Message
Source
4 = Host
1 Byte
Identifies where the message
is coming from.
Status
Bit 0: Retransmit
Bit 1-7: Unused
1 Byte
Identifies the transmission
status.
Unused bits must be set to 0.
Data
None
Checksum
2's complement sum of
message contents
excluding checksum.
2 Byte
Checksum of message.
Host Requirements
The host sends the SCAN_ENABLE command to enable scanning in the reader.
Scanning is enabled upon power-up, so this command need only be sent if a prior
SCAN_DISABLE command was sent.
Reader Requirements
The reader allows scanning and decoding upon receipt of this command.
Note
: At initial power-up, the reader assumes SCAN_ENABLED.
Содержание Dragon D151
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