Mindeo FS580, User Manual

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5-5 DECODE_DATA
Description: Decode data in SCI packet format
Packet Format
Length Opcode Status Decode Data Checksum
0x50
Field Descriptions
Field Name Format Size Description
Length
Length of message
(not including checksum).
1 Byte Length Field
Opcode 0x50 1 Byte Identifies the 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 attempts
Bit 7: always be 0(message is from the
scanner)
All unused bits recommend to be set to
0.
Decode Data <data> Variable
Data is decoded data including prefix
and suffix sent in ASCII format.
Checksum
2's complement sum of message
contents excluding checksum.
2 Bytes Checksum of message.
When the scanner uses this opcode Decode data packet format is selected to send decoded barcode
data to the host. The decoded data is contained in the Decode Data field.
For example: the decode data is “1234”, the DECODE_DATA message sent to host is as following.
Length Opcode Status Decode Data Checksum
0x07 0x50 0x00 0x31 0x32 0x33 0x34 0xFE 0xDF
Host Requirements
If ACK/NAK handshaking is enabled, the host responds ACK to the scanner when received correct data
packet.
Scanner Requirements
Decode data is sent in this format if Decode data packet format is selected via parameter. The host
responds to this message with a CMD_ACK, if ACK/NAK handshaking is enabled.