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Message Formatting
170 PowerScan™ M8500
•If you have not enabled the Scanner Address Stamping or the Scanner Address Delim-
iter, you must not specify them. In this case all messages will be implicitly addressed to
th
e 'binded' Scanner of the cradle directly connected to the serial line.
The Scanner can only receive messages if two-way mode is enabled. (See "Transmission
Mode" on page 165.
Messages cannot start with '$+' because they would be interpreted as a configuration
command.
You can send a message to the Scanner only while it is on. This happens when it has
s
e
nt a message to the host and the radio timeout has not yet expired. (See "Radio Proto-
col Timeout" on page 164).
If you want to control the Scanner's beeper fr
om the host, y
ou will also probably want
to disable the good transmission beep that is emitted when the code is received from
the cradle. (See "Beeper Volume" on page 113).
The message field can store plain text and escape sequences.
Escape sequences are interpreted as commands.
Plain text is directly printed on the display. If writing beyond the end of line, the dis-
play does not wrap automatically. Extra characters
ar
e ignored. Control characters are
not interpreted (i.e. LF, FF, etc.).
Cursor Control
ESC [
n
A
Up
n
rows, no scroll
ESC [
n
B
Down
n
rows, no scroll
ESC [
n
C
Right
n
columns
ESC [
n
D
Left
n
columns
ESC [ G
CR
ESC [
r
;
c
H
Move to row
r
, column
c
(ESC[1;1H is the upper left character position of the display)
ESC D
Down 1 row, with scroll
ESC E
CR and cursor down 1 row with scroll
ESC M
Up 1 row and scroll
Since CR is used as the message terminator, you must use ESC [ G
or ESC E to print a CR.
The cursor row position is not affected by the currently selected
fo
nt. The display always has 4 rows, so when writing with the large
font, actually two rows are written to: the current one and the one
below it. You will need
two ESC E commands to step from one row
to the next when using the large font.
The cursor column position is affe
cted by the currently selected
font. Therefore,
column 6 is 36 pixels from the left border only if
you last selected the 6x8 font; otherwise it could be 48 or 72 pixels
from the left border.
178


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