NCR 74 OFX (7874), Руководство пользователя

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Chapter 5: Programming 5-49
Message Delay
The Message Delay option sets the minimum time the firmware waits before sending
the next message. This permits lowering CTS by the host terminal to inhibit data from
the scanner. This option was not available on previous scanners.
Messages can be delayed as follows:
•
Hex 0 for no delay
•
Hex 1 for a 10 ms delay
•
Hex 2 for a 50 ms delay
Scanner/Scale Format
The Scanner or Scanner/Scale Format option permits forcing the data format to either
scanner only format or scanner/scale format to accommodate the host terminal. In
some circumstances a host terminal may not be able to handle the normal format sent
to it. In that case, selecting one of these options permits the use of the other format.
The choices for this option are as follows:
•
Hex 4 for Scanner only format
•
Hex 5 for Scanner/Scale format
The normal (default) format for scanner only tag data messages is as follows:
•
Scanner ‐ Only Tag Data
•
Message Format
Prefix Byte Label Identifier Tag Data PPD Terminator Byte BCC Byte
16564
Shading indicates optional information.
The normal (default) format for scanner/scale tag data messages is as follows:
•
Scanner/Scale Tag Data
•
Message Format
Prefix Byte Label Identifier Tag Data PPD Terminator Byte BCC Byte 30 38
Add FC
16565
Shading indicates optional information.
The difference between the scanner only and the scanner/scale format is that the
scanner/scale format has an address and a function code following the optional Prefix
Byte. For more detailed information on message formats refer to the NCR
Scanner/Scale Interface Programmer ʹ s Guide (BD20 ‐ 1074 ‐ A).