6-4
231 characters in length. A message cannot though, contain an @S
command in combination with any other command. A message
also
should not
contain more than 1 request for data entry (third
character in command is
1
). For example:
@1,1,1,ITEM@2,1,1,QTY
has two data entry “prompt” commands combined. If this message
were sent to the RF Terminal, the first data entry prompt
(
@1,1,1,ITEM
) would be executed, but any and all commands after
the first data entry prompt in that statement would be ignored
without warning – there will be no display or indication of an illegal
command.
The
@S
command (for serial output) statement
cannot
be
combined with any other command - even clear (
@Cx
) commands.
After a
@S
command is successfully completed, the Base Station
sends back to the host the RF Terminal ID followed by a CR
(ASCII 13). There is a 231 character limit on data for this
command. If you send a command of more than 231 characters,
you will get an Illegal Command returned, (ID ? CR). If you need
to send 300 characters of data, send the first part, wait for the
acknowledgement (ID CR), and then send the remaining part. If
you are using the
@S
command with a printer
other
than the Zebra
Cameo or QL3, you may have to change the
Protocol
parameter in
the RF Terminal to
XON/XOFF
. This will allow the RF Terminal
to deal with the character buffer limitations of your particular
printer. If you are using the O’Neil MicroFlash Printer, you must
send a
NULL
character before the valid data to wake up the
printer. See your printer manual for details and see
Chapter 6
for
details on printer protocol.
•
The @M command is similar to the @S command, except it
can
be combined with other commands because it is a data entry
command too. This command is for a printer initialization and
magstripe input on the Zebra Cameo printer equipped with the
magstripe option. The format of the command is:
@M
dddatttta
(EOT)
where dddatttta might be ! U1 MCR 80 T1 T2
+ CR
+ LF
(Refer to the Cameo manual for the exact string sequence you need
to send. The above example sends over an 10 second request for
reading Track 1 and Track 2)
.
There is no reply to the host except the magstripe data. If the card
cannot be read, pressing the ENTER key on the Terminal will send
back ID+CR. This is the breakout method.
