Section 3. Commands, Formats, and Timing
Unsuccessful Card Read
<STX>
<ESC> ERROR
USER DRIVER
STATUS
CARD SENSOR
STATUS
<CR> <ETX>
End of Text
Character,
(03 Hex)
Optional.
Set SWA # 8
to ON
Carriage
Return
Character (OD Hex)
Optional.
Set
SWB
#1
to ON.
ASCII “0” = No Card is in the Reader
ASCII
“1”
=
Card
present
in
the
Reader
ASCII”0” = Drivers 1 and 2 OFF
ASCII”1”
=
Driver
1
ON
ASCII”2”
=
Driver
2
ON
ASCII”3” = Drivers 1 and 2 ON
Set
SWB
#3
ON
ASCII “E” represents error. If both tracks fail
on a dual track reader, an “EE” will be transmitted.
If one of two tracks fails on a dual track reader, it
will be replaced with an “E”. On a dual track reader,
the higher density track will be transmitted first.
If a card is inserted so the oxide is not in contact with the head,
the unit outputs a single “E” no matter whether it is a single or
dual
track
unit.
Escape character, optional
(1B hex), set SWA #7 to ON
Start of Text Character, optional (02 hex),
Set SWA #6 to ON
Notes:
1. Optional characters are used to frame the data.
2. The optional Hex characters are shown with the parity bit as zero (“0”).
Figure 3-2. Unsuccessful Card Read
15
