Mindeo FS580, User Manual

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84
5-9 START_DECODE
Description: Ask the scanner to attempt to decode a barcode
Packet Format
Length Opcode Status Checksum
0x03 0x53
Field Descriptions
Field Name Format Size Description
Length 0x03
1 Byte Length Field
Opcode 0x53
1 Byte Identifies this opcode type.
Status
Bit 0: Identifies transmit status
Bit 6-1: Unused
Bit 7: Command source
1 Byte
Bit 0:
0=First time packet is sent
1= Subsequent transmission
Bit 7: always be 1(message is from
the host)
All unused bits recommend to be set
to 0.
Checksum
2's complement sum of message contents
excluding checksum.
2 Bytes Checksum of message.
This command asks the scanner to start a scan and a decode session. The decode session ends with a
successful decode, or a scan session time-out, or a STOP_DECODE command.
For example: Host sends START_DECODE command
Length Opcode Status Checksum
0x03 0x53 0x80 0xFF 0x2A
Host Requirements
None.
Scanner Requirements
The scanner must attempt decode a barcode once whatever the scan mode is, after receiving the
START_DECODE command.