Intermec Transaction Manager 9560, Руководство пользователя

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9560 Transaction Manager User’s Manual
5-12
EOM Characters (End of Message)
The EOM character follows the data and indicates the end of a data block. The
EOM character is a protocol character and is not part of the data format. The
9560 can transmit one or two EOM characters.
If you use NUL for the first EOM character, the reader transmits the ASCII
NUL character (00 Hex) and disables communications from the host. If you
enter NUL for the second EOM character, the reader disables the second
character and transmits nothing for the character. The characters cannot be the
same, unless both are NUL.
Error Checking
In User-Defined protocol, the reader can add a Longitudinal Redundancy
Check (LRC) character to data transmissions. The host must have software to
handle the LRC.
The LRC character is the exclusive “OR” of the seven (or eight) data bits in the
data block. The LRC character is the last character sent, but it is not part of the
data. For more detailed information, refer to the Data Communications Reference
Manual.
Displaying Data on the 9560
The 9560 has either a 2-line by 40-character standard display or a 1-line by
20-character oversize display. You can scroll the standard display back two
lines. You can scroll the oversize display back three lines, one line at a time.
Note: The keypad on the 9560 does not provide keys for scrolling. You must use an
IRL program, scan bar code command labels, or use the arrow keys on the 1700
keyboard to scroll the display.
Types of Data Displayed
The reader distinguishes between four data types for the display:
Input data
All data entered from the keyboard or an input device. This includes
IRL program statements being entered and displayed in the editor.
Host messages
Any message received from the host at the reader modem port
with the correct protocol. Host messages can interrupt the current display at
any time.
Reader prompts All messages to the operator, such as those that occur during
Prompting Configuration, with the exception of those messages that describe
errors. This also includes IRL prompt statements when an IRL program is
running.