Intermec Transaction Manager 9560, Руководство пользователя

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9560 Transaction Manager User’s Manual
10-6
Communications Errors
A communications error occurs when the reader fails to complete a transaction
with the host. When an error occurs, the reader sounds three beeps (high low
high) and displays the error message on the reader display or the CRT
terminal. The 9560 displays error messages only when the reader display or the
reader terminal port is configured for buffered operation.
The table at the end of this section lists some of the most common
communications errors and their causes.
Host Communications Failure
Two types of errors cause communication failures with the host: Receive errors
and Transmit errors.
When the host does not receive a transmission, a receive error occurs. You can
ignore this error or enter a command. If an error occurred during a
transmission to the host, the 9560 saves the data for automatic retransmission.
To clear the complete data buffer, use the Clear command.
When the host sends a transmission to the reader and a transmit error occurs,
the reader does not buffer any more data. The only commands accepted from
the scanner or terminal are:
• Clear
• Transmit No Clear
• Reset
• Enter Configuration
• Enter
• Review
• Backspace
• Forward
• Set Clock
If you attempt to enter data or other commands, the reader sounds three low
beeps.
Maximum Received Data
The reader can receive up to 255 data characters from the host (excluding
protocol characters). If the host sends more than 255 characters, a host
communications failure occurs.