Datalogic QuickScan I QD21 1 Series, Руководство по продукции

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Product Reference Guide 277
Chapter 5
Message Formatting
Message Formatting
A message from the Host to the base must follow these rules:
• If Address stamping options or address delimiter are enabled on the base,
the Host replay must have address field and delimiter too. Otherwise the
message will be ignored. Address delimiter is present only when address
stamping is enabled.
• Address stamping is necessary to correctly route the message to the
QuickScan I 21X1, especially when more than one handheld is linked to the
same base. Address stamping could be disabled if the system is in point to
point configuration. If address stamping is not enabled, the messages are
addressed to the first handheld linked to the base.
• The maximum character length for messages is 48.
• Messages end with “CR” 0x0D ASCII character. The CR character cannot be
contained in the middle.
• Messages cannot start with '$' or # because these are reserved for Service
mode command
• Base station can receive host message only if Host Commands Obey/
Ignore is set to Ignore.
• Message could be sent to the HH in response to a Label when “Transmit
mode” require Ack from Host (see transmit mode parameter) or at any
time. When messages are sent not in response to a label must start with
DC2 0x12 ASCII character and could be sent in any transmit mode setting.
• Message could be sent to all HH linked to base by using a Multicast mes-
sage:

“00 00 00 00 2A AA”
• In order to receive a message, handhelds must not be in sleep state.
The format of the ACK from Host message (used for transmission mode 02) is:
[Scanner_Addr] [Scanner_Addr_delimiter] MESSAGE <CR>
The format of a generic message From Host to HH is:
[Scanner_Addr] [Scanner_Addr_delimiter] DC2 MESSAGE <CR>
NOTE
Message Formatting should only be available for the QuickScan™ 21XX Star models.