Symbol LS 6800, User Manual

Page: 49 / 249

5-9
Programming the LS 6800
Parameter Programming via RS-232C (Simple
Scanner Control — Enable and Disable)
Parameters are stored in non-volatile memory, and they control different options for scanner
operation. These are usually programmed by scanning special Code 128 bar codes, which
begin with
<FN3> , from this manual. However, by enabling parameter programming via RS-
232, you can program the scanner through host command to the scanner’s RS-232 port, a
capability contained in a feature set called Simple Scanner Control.
Command Syntax
. When using Simple Scanner Control, program a scanner parameter by
sending a string to the scanner in this format:
13XXXX<parameter bar code>
where
<parameter bar code>
refers to the string of characters (found under each
programming bar code in this manual, minus the
<FN3>
character) encoded in the bar code
for the parameter option you wish to set, and
XXXX
is a four-digit hexadecimal number
representing the number of characters in the command. For example, to enable Pulse Trigger,
send: 13000D2050202. To disable Pulse Trigger, send 13000D2050200.
Depending on the application environment, it may be possible to enable LRC checksum and
ACK/NAK protocols for this communication. See LRC Checksum on page 5-43 and
Software Handshaking on page 5-86.
Optional T Character
. An optional ‘T’ character can be added to the string
<parameter bar
code>
to indicate a temporary change to the value of a parameter which lasts only during one
power cycle. After that cycle, the value returns to that saved in the unit’s EEPROM. The ‘T’
character option does not apply for numerical keypad entries, Set Defaults, or for other
parameters (e.g., Flush Macro PDF Buffer) which perform a single, isolated action rather than
change a parameter setting in EEPROM. The ‘T’ character counts in the total to be entered
in the XXXX field.
Two parameters which require scanning several bar codes can be changed by sending a single
RS-232 command. These parameters are Raster Height and Raster Expansion Rate. Their
respective single RS-232 commands are: 13000D20N030X and 13000D20N020X, where X
is a hexadecimal value between 1 and F inclusive, representing the parameter value. Sending
two consecutive ESC characters (ASCII decimal value 27) resets the command parser.
At least 1.25 seconds must elapse after a parameter change in EEPROM before the scanner
can accept another parameter change command. With temporary parameter changes, at least
100 ms must elapse between consecutive commands.