4/14/2016
D014465 CR1400 CR1000 CR2300 CR2600 CR3600 CR44X5 CR8000 CR900FD CR6000 CR5000 T500 Client Version ICD
Page 24 of 106
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The way a Q command is handled is equivalent to a P command – the effects are immediate but
won’t survive a reboot. If you want the setting to be set after a reboot, issue a Q then W or use the
newer CQ combination.
(The Reader will respond with d or e.)
Note: Also see commands O, P, Q, /, =, W. See Section 9 for possible Reader settings.
R
Requests that the previously sent packet be re-sent by the Reader; data may specify a maximum
packet size the receiver will accept: data is either empty or specifies a 16-bit big-endian unsigned
integer (2 bytes). If data is empty or specifies a size less than 32 (the minimum packet size), the
Reader will use its preferred maximum packet size. Otherwise, it will use the specified max packet size
(or less) and will fragment data across multiple smaller packets when necessary.
(The Reader will respond by resending its previous packet or with e if there was no previous packet. If
the max data size has changed, it may resend the previous data in a sequence of more than one
packet.)
T
Requests the current date and time (no data)
(The Reader will respond with d with data containing the date and time formatted as yyyy-mm-dd
hh:mm:ss.)
W
Requests the Reader to write its current settings from RAM to its non-volatile memory.
(The Reader will respond with d or e.)
Note: The W command saves changes that have been make with a /, O, P or Q so those settings will
survive a reboot. If you issue a P(2B)0 command to change the value of register 2B from 1, then
reboot the reader, the value of the 2B register will be 1 when the reader is ready again. In order to
have that setting survive a reboot you must either issue a P then a W command or use the newer C
command. C(2B)0 is the same as these two commands combined: P(2B)0, W
(The Reader will respond with d or e.)
Note: Also see commands O, P, Q, /, =, W. See Section 9 for possible Reader settings.
Y
Acknowledge the receipt of a packet; data specifies the received packet number (one byte).
(The Reader will not respond.)
Z
Request the Reader to reboot
data is:
empty or ‘0’; reboot the Reader.
‘1’; restart application.
(The Reader will respond with d or e before it reboots.)
^
Requests the Reader to upload the specified stored file; data contains the file name, terminated with
ASCII NUL.
The Reader will respond with:
A ‘g’ packet containing “filename<tab>(size)”
