Intermec Trakker Antares 2400, Руководство пользователя

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Chapter 3— Operating the Terminal in a Network
Trakker Antares 242X Handheld Terminal User’s Manual 53
You can configure the following serial port parameters:
• Baud rate
• Data bits
• Parity
• Stop bits
• Flow control
• EOM (End of Message)
• Configuration commands via serial port
• LRC
• SOM (Start of Message)
• Handshake (enabled or disabled)
• Poll (Polling) (enabled or disabled)
• Timeout Delay
Configurable protocol uses EOM to determine one of the following serial
communications modes.
Character Mode
When EOM is disabled, the terminal communicates in Character mode
processing each character. Character mode supports both XON/XOFF
and CTS/RTS flow control.
Frame Mode
When EOM is enabled, the terminal communicates in Frame mode.
When a terminal sends a packet, it adds a protocol character. When a
terminal receives a packet, it strips any protocol characters before it sends
the information to the terminal application. Frame mode supports both
XON/XOFF and CTS/RTS flow control. In Frame mode, you can also
configure the following serial port parameters:
• Configuration commands via serial port
• Handshake
• LRC
• SOM
After you enable Handshake, you can define poll and timeout delay.
Master Polling Protocol
Master Polling Mode D protocol requires the terminal to ask the downline
serial device for data it may have (polling) and to request to send data to
the serial device (selecting). There is no automatic polling, so your
application must poll periodically for data.