Справочное Руководство для LXE 1280
110
Message Format
LDS Plus Reference Guide
E-SW-LDSPLUSRG-G
Control Character (CTRL)
Note:
CTRL is not applicable to Protocol messages.
A control character (CTRL) specifies how a message is used and/or functions. The CTRL
character is not displayed on the screen.
character is not displayed on the screen.
Outbound and inbound messages have different uses for the control character:
• Control characters in an outbound message determine how a DOS terminal reacts to
a message. Control characters can indicate whether the message is a form or non-
form, forced or unforced, activate multiple beeps at the DOS terminal, switch data
entry to barcode or auxiliary input, and/or change the auto transmit buffer length.
form, forced or unforced, activate multiple beeps at the DOS terminal, switch data
entry to barcode or auxiliary input, and/or change the auto transmit buffer length.
• Certain outbound CTRL characters also require an additional character that is either
a Number (N) or an Expanded Function (EF) code (N/EF).
• Control characters in an inbound message indicate to the host whether the message is
a form or non-form message and if the message includes a sequence number.
The following terms are discussed in full later in this chapter: forced and unforced forms, multiple
beeps, auto transmit buffer length, N/EF, form or non-form and sequence numbers.
beeps, auto transmit buffer length, N/EF, form or non-form and sequence numbers.
SOL ID1 ID2 TYPE
CTRL
N/EF SEQ
# TEXT EOL
Figure 4-9 Location of CTRL Character in an Outbound Message
Here is an example of an outbound forced, non-form message showing the location of the control
character that enables barcode input (does not have N/EF character):
character that enables barcode input (does not have N/EF character):
C
is an outbound control character
that will send a forced message from
the host computer to terminal ID 14.
the host computer to terminal ID 14.
<14
C
Enter Part NumberC
R
L
F
Figure 4-10 Outbound Message with Control Character