ACS ACK30 Smart Keyboard - Manual (Page 20)

ACR30 Reference Manual
Version 3.3 January 2009 Page 20 of 44
ACR30
C_SEL The currently selected card type as specified in a previous SELECT_CARD_TYPE
command. A value of 00
H
means that no card type has been selected.
C_STAT Indicates whether a card is physically inserted in the reader and whether the card is
powered up:
00
H
: no card inserted
01
H
: card inserted, not powered up
03
H
: card powered up
9.1.2. SET_PROTOCOL
This command is used to control the line speed of the communication channel between ACR30
reader and host device. The line speed of the communication is controlled by two factors, namely, the
Delay Factor and the Baud Rate.
Command format
Instruction
Code
Data length Data
DELAY N
03
H
01
H
to change only the Delay Factor (for RS232 reader only), or
Instruction
Code
Data length Data
DELAY N BAUD RATE
03
H
02
H
to change the Delay Factor and the Baud Rate (for RS232 reader only).
DELAY Determines the time delay inserted by the ACR30 between two consecutive bytes sent in
order to adapt to slower host system speeds. The time delay is given by N * 0.1msec,
with N ranging from 0 ... 255 (00 - FF
H
). The default value is N = 0 (delay changes only
valid on RS232 reader).