A24-HASM-450 Digi International/Maxstream, A24-HASM-450 Datasheet - Page 9

• Manufacturer Part Number: A24-HASM-450
• Description: ANT 2.4GHZ DIPOLE HALF-WAVE
• Manufacturer: Digi International/Maxstream
• Series: XPressr

Specifications of A24-HASM-450

• Antenna Type: Whip: 1/2 Wave, Swivel, Tilt (Right Angle)
• Number Of Bands: 1
• Frequency: 2.4GHz
• Vswr: 2
• Gain: 2.1dBi
• Termination: RP-SMA
• Mounting Type: Connector
• Height (max): 4.35" (110.5mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 70000340; Q2724499B

2. RF Module Operation
2.1. Serial Communications
2.1.1. UART Data Flow
2.1.2. Serial Buffers
Serial Data
Serial Receive Buffer
The XBee Series 2 OEM RF Modules interface to a host device through a logic-level asynchronous
serial port. Through its serial port, the module can communicate with any logic and voltage
compatible UART; or through a level translator to any serial device (For example: Through a
MaxStream proprietary RS-232 or USB interface board).
Devices that have a UART interface can connect directly to the pins of the RF module as shown in
the figure below.
Figure 2‐01. System Data Flow Diagram in a UART‐interfaced environment
Data enters the module UART through the DIN (pin 3) as an asynchronous serial signal. The signal
should idle high when no data is being transmitted.
Each data byte consists of a start bit (low), 8 data bits (least significant bit first) and a stop bit
(high). The following figure illustrates the serial bit pattern of data passing through the module.
Figure 2‐02. UART data packet 0x1F (decimal number ʺ31ʺ) as transmitted through the RF module
The module UART performs tasks, such as timing and parity checking, that are needed for data
communications. Serial communications depend on the two UARTs to be configured with
compatible settings (baud rate, parity, start bits, stop bits, data bits).
The XBee Series 2 modules maintain small buffers to collect received serial and RF data. The serial
receive buffer collects incoming serial characters and holds them until they can be processed. The
serial transmit buffer collects data that is received via the RF link that will be transmitted out the
UART.
When serial data enters the RF module through the DIN Pin (3 pin), the data is stored in the serial
receive buffer until it can be processed.
© 2007 Digi International, Inc.
(Low‐asserted signals distinguished with horizontal line over signal name.)
Example Data Format is 8‐N‐1 (bits ‐ parity ‐ # of stop bits)
DOUT (data out)
DIN (data in)
DOUT (data out)
DIN (data in)
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