6
3-4.
Command and Response Transfer Formats
Command Transfer Formats
STX Commands
Data
String ETX
BCC
Response Transfer Formats
STX
Commands
Status Data
String ETX BCC
Data string must be within 1024 bytes.
BCC is an exclusive logic sum from the command to ETX.
3-5.
Transfer Control Characters
The following shows the transmission control character codes and functions.
BCC is an exclusive logic sum from the command to ETX.
Character Code
Function
STX
02h
Text start symbol
ETX
03h
Text end symbol
ACK 06h
Normal
response
NAK 15h
Resent
request
DLE 10h
Reject
response
LF
0Ah
Line feed of printed line
ESC 1Bh
Start
escape
sequence
BCC -
Block
check
character