3-4
Command and Response Transfer Formats
Command Transfer Formats
STX Commands
Data
String
ETX
BCC
Response Transfer Format
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
Transmission Control Characters
The following shows the transmission control character codes and functions.
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
BCC is an exclusive logic sum from the command to ETX.
3-6
Cards for Processing
The cards that can be processed are called
readable and writable cards
.
When the card is inserted into the inlet, it is a process targeted card.
When the process is completed, the card waits in the device, and is a process targeted card.
When idling in the device, the idling card is a process targeted card regardless of whether there
is a card at the inlet.
Cards discharged from the device are
removal waiting cards
and are no longer process target
cards.
To process these cards, they must be removed from the device once, and then reinserted, or
they can be processed by employing the
removal wait cancel command
.
6