Symbol SE 923, Integration Manual

Page: 186 / 238

6-30
SE-923 Scan Engine Integration Guide
SCAN_ENABLE
Description: Permit the decoder to scan bar codes
Packet Format
Field Descriptions
Host Requirements
The host sends the SCAN_ENABLE command to tell the decoder to allow scanning. Scanning
is enabled upon power-up, so this command need only be send if a prior SCAN_DISABLE
command has been sent.
Decoder Requirements
The decoder allows scanning and decoding upon receipt of this command.
Note: At initial power-up, the decoder should assume SCAN_ENABLED.
Length Opcode Message Source Status Data Checksum
0x04 0xE9 0x04
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 Bytes Checksum of message.