Intermec Trakker Antares 2475, Руководство пользователя

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Chapter 3— Operating the Terminal in a Network
44 Trakker Antares 2475 Vehicle-Mount Terminal User’s Manual
• 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.
Before each transmit operation, the terminal issues the SEL sequence for
the device addressed and sends the data if an acknowledge is received.
Before each receive operation, the terminal issues a poll sequence and waits
for data or the RES character (no data is available to send).
You can configure the following serial port parameter:
• Baud rate
Polling Mode D Protocol
Polling Mode D protocol requires the host computer to ask the terminal
for data it may have (polling) and to request to send data to the terminal
(selecting). This protocol uses an RS-232 interface and implements the
user interface through reader commands. Polling Mode D also supports
XON/XOFF and CTS/RTS flow control.
You can configure the following serial port parameters:
• Baud rate
• Flow control
Point-to-Point Protocol
Point-to-Point protocol is not directly supported on the terminals.
However, you can simulate this protocol by setting the protocol to
Configurable and configuring these parameters:
• Baud rate
• Data bits
• Parity
• Stop bits
• Flow control
• EOM (Set EOM1 to \x0D, which is <CR>, and set EOM2 to \x0A,
which is <LF>)
• LRC (Disable)
• Handshake (Disable)