Intermec Trakker Antares 2400, Руководство пользователя

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Chapter 3— Operating the Terminal in a Network
54 Trakker Antares 242X Handheld Terminal User’s Manual
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
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)
With this protocol, you cannot configure values for intercharacter delay,
turnaround delay, and timeout delay. This protocol supports CTS/RTS
flow control only.
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 or an RS-422 interface and
implements the user interface through reader commands. Use this protocol
if you want to connect to a 900 MHz RF network via the 9189 RF
Gateway. Polling Mode D also supports XON/XOFF and CTS/RTS flow
control.
You can configure the following serial port parameters:
• Baud rate
• Flow control