XIB-R【PDF 9/36 页】BOARD INTERFACE RS232/485

9XCite"燨EM燫F燤odule?燩roduct燤anual爒2.1燵2007.01.04]

2007燤axStream,營nc.

牋牋?

2.1.3. Serial Data

Data enters the MaxStream RF module through the DI Pin as an asynchronous serial signal. The

signal should idle high when no data is being transmitted.

The UART performs tasks (such as timing and parity checking) needed for communication. Serial

communication consists of two UARTs which must be configured with compatible parameters

(Baud rate, parity, start bits, stop bits, data bits) to have successful communication. Each data

packet 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 modem.

Figure?03. Serial?UART)燿ata爌acket?x1F?decimal牶31?燼s爐ransmitted爐hrough爐he燲Cite燤odule

Data燜ormat爄s?N1?8燽its?燦o燩arity??燬top燘it)

In the example above, the MaxStream RF module transfer 8 bits over-the-air [Selectable using BI

(Number of Bits) Parameter]. Start and stop bits of the UART signal are not transmitted over-the-

air, but are regenerated by the receiving modem.

The MaxStream OEM RF Modules support the following data formats [See NB (Parity) Parameter]:

" 8-none-1, 7-any-1

" 8-even-1

" 8-odd-1

" 8-mark-1, 8-none-2

" 8-space-1

DI (Data In) Buffer

Once serial data has entered the 9XCite Module through the Data In (DI) Pin, the data is stored in

the DI Buffer until it can be transmitted.

Once the first byte of data enters the DI Buffer, the module begins to initialize the RF channel

(unless RF data is being received). In the case where the module is receiving RF data, the serial

(UART) data is stored in the DI Buffer. When the DI Buffer has only 17 bytes of memory left, the

XCite Module de-asserts (high) CTS

to signal to the host device to stop sending data. CTS

re-

asserts once the DI Buffer has at least 35 bytes available in memory. Once in the DI Buffer, the

data is packetized for transmission.

发布紧急采购，3分钟左右您将得到回复。

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购