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4-5 REQUEST_REVISION
Description: Request the software revision string from the engine
Packet Format
Length
Opcode
Status
Checksum
0x03
0x56
(‘V’)
Field Descriptions
Table 4-7 Field Descriptions
Field Name
Format
Size
Description
Length
Length of message (not including
checksum).
1 Byte
Length Field
Opcode
0x56
1 Byte
Identifies this opcode type.
Status
Bit 0：Retransmit
Bit 1-6：Unused
Bit 7: Command source
1 Byte
Bit 0: Identifies the transmission
status.
Bit 7: 1, Command is from the host.
0, Command is from the scanner.
All unused bits must be set to 0.
Checksum
2's complement sum of message
contents excluding checksum.
2 Bytes Checksum of message.
For example:
Length
Opcode
Status
Checksum
0x03
0x56
0x80
0xFF 0x27
Host Requirements
The host sends this message to request revision information from the scanner. The scanner responds
with REPLY_REVISION.
Scanner Requirements
The scanner sends its revision string to the host. See REPLY_REVISION for format.
