Scan_Enable - Symbol SE 923 Integration Manual

SE-923 Scan Engine Integration Guide

SCAN_ENABLE

Description: Permit the decoder to scan bar codes
Packet Format
Length
0x04
Field Descriptions
Field Name
Length Length of message (not
including checksum).
Opcode 0xE9
Message 4 = Host
Source
Status Bit 0: Retransmit
Bit 1-7: Unused
Data
Checksum 2's complement sum of
message contents
excluding checksum.
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.
6-30
Opcode Message Source
0xE9 0x04
Format
Status
Size
1 Byte Length Field
1 Byte Identifies this Opcode type.
1 Byte Identifies where the message is
coming from.
1 Byte Identifies the transmission status.
Unused bits must be set to 0.
None
2 Bytes Checksum of message.
Data Checksum
Description