OPTICON
Software Guide
MDL-1000/2000
27
4-2-5.
CMD_NAK
・
Feature: NAK
Length Operation
Code Message
Source Status
Cause
Checksum
04 D1
Field Format
Size
(Byte)
Function
Length
Length
1
The length of a packet excluding checksum.
Operation
Code
D1 1
Packet
ID
Message
Source
0:Module
4:Host
1
From The Host System to This Scan Engine
and vice versa
Status Bit0:
retransmit
Bit1: Unused
1
Cause
Reason code
1
0
:
Reserved
1: Checksum failure
2: Illegal Operation Code or Format
6: Other negative acknowledgement
Others: Reserved
Checksum
2
Two’s complement sum of message contents
(from Length to Data Field).
Negative acknowledgement for command data.